The DOI matches its Crossref record; none of the 8 sources its claims cite is checked for support yet.
Effect of Vitamin D Supplementation on Testosterone Levels in Men
Open accessAbstract
The male reproductive tract has been identified as a target tissue for vitamin D, and previous data suggest an association of 25-hydroxyvitamin D [25(OH)D] with testosterone levels in men. We therefore aimed to evaluate whether vitamin D supplementation influences testosterone levels in men. Healthy overweight men undergoing a weight reduction program who participated in a randomized controlled trial were analyzed for testosterone levels. The entire study included 200 nondiabetic subjects, of whom 165 participants (54 men) completed the trial. Participants received either 83 μg (3,332 IU) vitamin D daily for 1 year (n = 31) or placebo (n =2 3). Initial 25(OH)D concentrations were in the deficiency range (< 50 nmol/l) and testosterone values were at the lower end of the reference range (9.09-55.28 nmol/l for males aged 20-49 years) in both groups. Mean circulating 25(OH)D concentrations increased significantly by 53.5 nmol/l in the vitamin D group, but remained almost constant in the placebo group. Compared to baseline values, a significant increase in total testosterone levels (from 10.7 ± 3.9 nmol/l to 13.4 ± 4.7 nmol/l; p < 0.001), bioactive testosterone (from 5.21 ± 1.87 nmol/l to 6.25 ± 2.01 nmol/l; p = 0.001), and free testosterone levels (from 0.222 ± 0.080 nmol/l to 0.267 ± 0.087 nmol/l; p = 0.001) were observed in the vitamin D supplemented group. By contrast, there was no significant change in any testosterone measure in the placebo group. Our results suggest that vitamin D supplementation might increase testosterone levels. Further randomized controlled trials are warranted to confirm this hypothesis.
Overview
AI snapshot
Written from the paper’s full text.
TL;DR
In a subgroup analysis of overweight men from a 1-year randomized vitamin D trial, daily 83 µg vitamin D increased all measured testosterone fractions, whereas placebo did not. The authors conclude vitamin D supplementation might increase testosterone, but confirmatory randomized controlled trials are needed.
Key findings
- In the vitamin D group (n=31), total testosterone increased from 10.7 ± 3.9 to 13.4 ± 4.7 nmol/l (p<0.001), bioactive testosterone from 5.21 ± 1.87 to 6.25 ± 2.01 nmol/l (p=0.001), and free testosterone from 0.222 ± 0.080 to 0.267 ± 0.087 nmol/l (p=0.001).
- In the placebo group (n=23), no significant change was found in total testosterone (11.8 ± 4.0 vs. 12.7 ± 5.45 nmol/l, p=0.355), bioactive testosterone (6.39 ± 2.22 vs. 6.59 ± 2.33 nmol/l, p=0.626), or free testosterone (0.264 ± 0.087 vs. 0.278 ± 0.097 nmol/l, p=0.532).
- Circulating 25(OH)D increased by 53.5 ± 65.3 nmol/l to 86.4 ± 68.8 nmol/l in the vitamin D group (p<0.001), but increased only nonsignificantly in the placebo group (by 5.8 ± 21.3 nmol/l to 35.5 ± 18.0 nmol/l; p=0.215).
- In the placebo group, men recruited in the winter half-year had nonsignificantly lower 25(OH)D, total testosterone, bioactive testosterone, and free testosterone than men recruited in the summer half-year.
Methods
- Subgroup analysis of a previously published prospective, double-blind randomized controlled trial in nondiabetic overweight subjects undergoing a 12-month weight reduction program; 200 subjects were included (62 men), and 165 completed (54 men analyzed: 31 vitamin D, 23 placebo).
- Participants received either 83 µg (3 332 IU) vitamin D daily or placebo for 1 year; fasting blood samples were drawn at baseline and after 1 year, with 25(OH)D measured by radioimmunoassay, testosterone and SHBG by Immulite 2000, and bioactive/free testosterone calculated according to Vermeulen et al.
- Baseline characteristics are presented as means ± SD; intra-group paired t-tests were used rather than intergroup comparisons because no sex-stratified randomization was performed at baseline; p<0.05 was considered statistically significant.
Limitations
- The paper states that the effect of vitamin D supplementation on testosterone was not a prespecified study outcome, that testosterone-related functions such as libido, mood, or muscle strength were not assessed, that the number of male participants was relatively small, and that future studies must clarify whether vitamin D actions are mediated by a pituitary or testicular effect.
- Evident from the text: this is a subgroup analysis of male participants from a trial not sex-stratified at baseline, and the main testosterone comparisons were within-group rather than between-group, limiting causal inference.
Model-written summary. Check it against the paper before relying on it.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
10 Own result · 8 Sources not found · 8 Own method · 2 Own interpretation
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“free testosterone levels (from 0.222 ± 0.080 nmol / l to 0.267 ± 0.087 nmol / l; p = 0.001)”
- Also stated in: § ▼ · plain
“fT from 0.222 ± 0.080 nmol / l to 0.267 ± 0.087 nmol / l (p = 0.001)”
plaindirectn = 31 ·- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Also stated in: § ▼ · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Initial 25(OH)D concentrations were in the defi ciency range ( < 50 nmol / l)”
- Also stated in: § ▼ · plain
“At study entry, mean 25(OH)D concentrations were in the defi ciency range in both groups.”
plainn = 54- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Also stated in: § ▼ · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“By contrast, there was no significant change in any testosterone measure in the placebo group.”
plainn = 23- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“bioactive testosterone (from 5.21 ± 1.87 nmol / l to 6.25 ± 2.01 nmol / l; p = 0.001)”
- Also stated in: § ▼ · plain
“BAT from 5.21 ± 1.87 nmol / l to 6.25 ± 2.01 nmol / l (p = 0.001)”
plaindirectn = 31 ·- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Also stated in: § ▼ · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“TT increased from 10.7 ± 3.9 nmol / l to 13.4 ± 4.7 nmol / l (p < 0.001)”
plaindirectn = 54 ·- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“Third, the male reproductive tract is a target tissue for vitamin D eff ects [3] .”
What the sources say
- Not matchedcites [3]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Not matched
In the paper
“The vitamin D receptor (VDR), as well as key enzymes for vitamin D metabolism, are widely expressed in human tissues and cells [2] .”
What the sources say
- Not matchedcites [2]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Not matched
In the paper
“Second, vitamin D status is directly associated with testosterone levels in men [6] .”
What the sources say
- Not matchedcites [6]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Not matched
In the paper
“Blomberg Jensen et al. [3] observed signifi cant expressions of the VDR and vitamin D metabolizing enzymes in the male reproductive tract including Leydig cells of the testis.”
What the sources say
- Not matchedcites [3]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Not matched
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Our results suggest that vitamin D supplementation might increase testosterone levels.”
- Also stated in: § Discussion ▼ · hedged
“The results of this study suggest that vitamin D supplementation might increase testosterone levels in men.”
- Also stated in: § Discussion ▼ · hedged
“In conclusion, our study results suggest that vitamin D supplementation might increase testosterone levels in men.”
hedgedconditionaln = 31 ·- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Also stated in: § Discussion ▼ · hedged
- Probably not a substantial claim. 15
- It may state two separate claims as one. 3
- The quote only partly states this claim. 1
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“PTH decreased in the placebo and vitamin D group (decrease by 0.94 ± 3.09; p = 0.035, and 0.60 ± 1.67; p = 0.040, respectively)”
plainn = 54 ·- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“1,25(OH) 2 D tended to increase in both groups (increase by 20.4 ± 41.0; p = 0.027 and 21.7 ± 106.0; p = 0.100, respectively).”
hedged- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“testosterone values were at the lower end of the reference range (9.09 -55.28 nmol / l for males aged 20 -49 years) in both groups.”
- Also stated in: § ▼ · plain
“At baseline, mean testosterone values were at the lower end of the reference range in both groups.”
plainn = 54- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
- Also stated in: § ▼ · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In the placebo group, there were nonsignifi cant trends for seasonal diff erences in 25(OH)D and testosterone values.”
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one. The quote only partly states this claim.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“During follow-up, weight loss was 5.9 ± 5.3 kg (p < 0.001) in the vitamin D group and 6.6 ± 5.7 kg in the placebo group (p < 0.001), and thus similar in both groups.”
plainn = 54- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“and that we did not assess testosterone-related functions such as libido, mood, or muscle strengths.”
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“The number of dropouts (3 men in the placebo and 5 men in the vitamin D group) did not diff er signifi cantly between groups (p = 0.745).”
plainn = 5- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“We are aware that no fi nal conclusions can be drawn from our study regarding the eff ect of vitamin D supplementation on testosterone in men”
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Another limitation is the relatively small number of male study participants.”
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Intra-group comparisons (paired t -test) rather than intergroup comparisons were used at the end of the study because no sex-stratifi ed randomization at baseline was performed.”
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
In the paper
“Recently, some of us [6] have shown in 2 299 men referred for coronary angiography that 25-hydroxyvitamin D [25(OH)D] levels are signifi cantly associated with testosterone levels and that both hormones reveal similar seasonal variations with a peak at the end of summer.”
What the sources say
- Not matchedcites [6]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plaincorrelationaln = 2,299- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. It may state two separate claims as one.
- Not matched
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“To avoid inter-assay variations, the samples of each participant were analyzed within the same assay run.”
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“One limitation is the fact that the eff ect of vitamin D supplementation on testosterone was not a prespecifi ed study outcome”
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“The original study was registered at clinical trials.govas NCT004493012.”
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“as part of a doubleblind randomized controlled trial [7]”
What the sources say
- Not matchedcites [7]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. It may state two separate claims as one.
- Not matched
The authors state this as an assumption.
Whether there exists a causal link between vitamin D and testosterone status is currently not known.
“Whether there exists a causal link between vitamin D and testosterone status is, however, currently not known.”
The authors state this as an assumption.
This work is the first study specifically addressing the effect of vitamin D supplementation on androgens in men.
“This work is, to the best of our knowledge, the fi rst study, which specifi cally addresses the eff ect of vitamin D supplementation on androgens in men.”
The authors state this as an assumption.
The similar decrease in PTH and the similar trend for an increase in 1,25(OH)2D in both study groups is due to a nonlinear association of these 2 calciotropic hormones with increasing circulating 25(OH)D levels, with a pronounced effect at low and virtually no effect at high 25(OH)D levels.
“We assume that the similar decrease in PTH and the similar trend for an increase in 1,25(OH) 2 D in both study groups is due to a nonlinear association of these 2 calciotropic hormones with increasing circulating 25(OH)D levels [10] , with a pronounced eff ect at low and virtually no eff ect at high 25(OH)D levels.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The cited source doesn’t support the claim as written.
In the citing paper
“Existing trials have yielded mixed findings: some reported increases in TT, calculated FT, BAT, or FAI after supplementation, whereas others showed no meaningful change in TT, SHBG, or FT-related outcomes [17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33].”
From Vitamin D Supplementation, Total Testosterone, and Androgen Bioavailability Markers in Adult Men: A Systematic Review and Meta-Analysis of Randomized Controlled Trials (2026) · cites this paper as [17]
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredThe cited source says what the claim attributes to it.
In the citing paper
“Pilz et al. [26] observed higher levels of testosterone in men who had been supplemented with 3332 IU/day of vitamin D for one year.”
From Influence of Sunlight and Oral D3 Supplementation on Serum 25(OH)D Concentration and Exercise Performance in Elite Soccer Players (2020) · cites this paper as [26]
The cited source says what the claim attributes to it.
In the citing paper
“High-risk comparisons were Zittermann 2019 [31]/EVITA and Pilz 2011 [17].”
The cited source says what the claim attributes to it.
In the citing paper
“Pilz et al. reported within-group increases in TT, calculated FT, and BAT after one year of vitamin D supplementation in overweight men participating in a weight-loss program [17].”
The check wasn’t confident either way, so it gives no verdict — never disputed.
In the citing paper
“Vitamin D induces myogenesis and muscle protein synthesis causing increases in fast-twitch muscle cells [1,6,26].”
From Influence of Sunlight and Oral D3 Supplementation on Serum 25(OH)D Concentration and Exercise Performance in Elite Soccer Players (2020) · cites this paper as [26]
Experimental — accuracy not yet measured
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ ▼
“increase by 5.8 ± 21.3 nmol / l to 35.5 ± 18.0 nmol / l; p = 0.215”
§ Discussion ▼
“| 25(OH)D (nmol / l) | 29.7 ± 23.7 | 35.5 ± 8.1 | 32.5 ± 20.0 | 86.4 ± 68.8 | 0.659 | 0.215 | < 0.001 |”
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Subjects and Methods ▼
“The SHBG reference range for males is 13 -71 nmol / l.”
§ Discussion ▼
“| SHBG (mmol / l) | 26.3 ± 13.7 | 29.5 ± 17.3 | 31.0 ± 10.3 | 35.3 ± 13.6 | 0.153 | 0.046 | 0.002 |”
Citations
Cites
Still being checked.
Research works printed but not linked: 10
- Holick MF . N Engl J Med 2007 ; 357 : 266 -281
- Bouillon R , Carmeliet G , Verlinden L , van Etten E , Verstuyf A , Luderer HF , Lieben L , Mathieu C , Demay M . Endocr Rev 2008 ; 29 : 726 -776
- Blomberg Jensen M , Nielsen JE , Jorgensen A , Rajpert-De Meyts E , Kris- tensen DM , Jorgensen A , Skakkebaek NE , Juul A , Leff ers H . Hum Reprod 2010 ; 25 : 1303 -1311
- Haring R , V ö lzke H , Steveling A , Krebs A , Felix SB , Sch ö fl C , D ö rr M , Nauck M , Wallaschofski H . Eur Heart J 2010 ; 31 : 1494 -1501
- Allan CA , Strauss BJ , Burger HG , Forbes EA , McLachlan RI . J Clin Endo- crinol Metab 2008 ; 93 : 139 -146
- Wehr E , Pilz S , Boehm BO , M ä rz W , Obermayer-Pietsch B . Clin Endocri- nol (Oxf) 2010 ; 73 : 243 -248
- Zittermann A , Frisch S , Berthold HK , G ö tting C , Kuhn J , Kleesiek K , Stehle P , Koerke H , Koerfer R . Am J Clin Nutr 2009 ; 89 : 1321 -1327
- Vermeulen A , Verdnock L , Kaufman JM . J Clin Endocrinol Metab 1999 ; 84 : 3666 -3672
- Krasnoff JB , Basaria S , Pencina MJ , Jasuja GK , Vasan RS , Ulloor J , Zhang A , Coviello A , Kelly-Hayes M , D ' Agostino RB , Wolf PA , Bhasin S , Mura- bito JM . J Clin Endocrinol Metab 2010 ; 95 : 2790 -2799 10
- Zittermann A . Prog Biophys Mol Biol 2006 ; 92 : 39 -48
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Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022756
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022750
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022780
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022753
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022774
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022777
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022768
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022771
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022765
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022783
Morgan, H. L., Eid, N. S., Holmes, N., Henson, S., Wright, V., Coveney, C., Winder, C. L., O’Neil, D. M., Dunn, W. B., Boocock, D. J., et al. (2024) · Figshare · doi:10.6084/m9.figshare.27022759
Maghsoumi‐Norouzabad, L., Zare Javid, A., Mansoori, A., Dadfar, M., & Serajian, A. (2021) · Figshare · doi:10.6084/m9.figshare.14721891
Maćkowski, M., Balon, S., Białowąs, M., Białowąs, W., Śmietana, A., Urban, K. P., Dubiel, K. M., Sojka, N. J., Szwed, P., & Magnowski, J. J. (2025) · International Journal of Innovative Technologies in Social Science · doi:10.31435/ijitss.4(48).2025.4349
Haider, K. S., & Zitzmann, M. (2026) · The Aging Male · doi:10.1080/13685538.2026.2630447
Yang, H., Tan, H., Zhao, J., Li, Q., & Cai, J. (2026) · International Journal of Impotence Research · doi:10.1038/s41443-026-01242-7
Associations between outdoor light exposure and low muscle mass: An NHANES 2011 to 2014 analysis
Xue, Z., Sun, D., Wang, Z., Yan, D., Deng, F., Yu, Z., & Liu, P. (2026) · Medicine · doi:10.1097/md.0000000000048257
MUTHUCHANDRASEKAR, V. V., Chinnasami, B., Z, A. F., Sundar, S., Hussain, A., & Murugesan, A. (2026) · European Journal of Clinical and Experimental Medicine · doi:10.15584/ejcem.2026.2.14
Goutam, R., Chattree, C., & Ahuja, J. (2026) · International Journal of Drug Delivery Technology · doi:10.25258/ijddt.16.62s.98
Karrar, S. K., & Atheer, H. O. (2026) · Research Journal of Biotechnology · doi:10.25303/2112rjbt0990103
Metadata
- Authors
- Pilz, S., Frisch, S., Koertke, H., Kuhn, J., Dreier, J., Obermayer-Pietsch, B., Wehr, E., & Zittermann, A.
- Affiliations
- Medical University of Graz (AT)
- Heart and Diabetes Center North Rhine-Westphalia (DE)
- Venue
- Hormone and Metabolic Research
- Publisher
- Georg Thieme Verlag KG
- Published
- 2010-12-10
- Volume
- 43
- Issue
- 03
- Pages
- 223-225
- ISSN
- 0018-5043 (ISSN-L)
- 1439-4286
- OpenAlex
- W2079831502
- Cited by
- 325
- References
- 0
- Citations by year
- 2026: 8 · 2025: 14 · 2024: 21 · 2023: 15 · 2022: 18 · 2021: 27 · 2020: 74 · 2019: 22 · 2018: 17 · 2017: 23 · 2016: 19 · 2015: 15 · 2014: 21 · 2013: 13 · 2012: 12
- FWCI
- 6.60
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Hormone and Metabolic Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Vitamin D Research Studies
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
- Health Sciences › Medicine › Reproductive Medicine › Sperm and Testicular Function
- Keywords
- vitamin D supplementation, testosterone, 25-hydroxyvitamin D, free testosterone, male reproductive tract, vitamin D deficiency, weight loss, overweight men
- MeSH terms
- Adult, Humans, Middle Aged, Obesity, Testosterone, Vitamin D, Dietary Supplements
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-11-10, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-11-10 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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