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A systematic review of the safety of probiotics
Abstract
INTRODUCTION: There is growing evidence on the use of probiotics in various diseases, especially in gastrointestinal (GI) diseases. Although probiotics have been found helpful in many illnesses, they do not always seem to be safe. Through interference with commensal microflora, they can result in opportunistic performances in the host due to bacterimia and fungemia. Since considerable numbers of consumers use probiotic products worldwide, assurance of safety of these products is necessary. AREAS COVERED: This review evaluates all the existing information about the safety of probiotics in humans and animal models up to May 2013. In all eligible published studies in which adverse effects and tolerability of probiotics were investigated and reported, no language limitations were applied. The main key search terms were 'probiotics,' 'safety,' 'side effects,' 'clinical trial' and 'adverse effects.' The vast majority of trials investigated Bifidobacterium (B) and Lactobacillus (L) species. EXPERT OPINION: The main observed adverse effects of probiotics were sepsis, fungemia and GI ischemia. Generally, critically ill patients in intensive care units, critically sick infants, postoperative and hospitalized patients and patients with immune-compromised complexity were the most at-risk populations. While the overwhelming existing evidence suggests that probiotics are safe, complete consideration of risk-benefit ratio before prescribing is recommended.
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“A systematic literature review of probiotic safety published in 2014 reported that “the overwhelming existing evidence suggests that probiotics are safe” for the general population, and that critically ill patients, postoperative and hospitalized patients and immunocompromised patients were the most at-risk groups wherein AEs occurred [220].”
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Abenavoli, L., YOSYPENKO, K., YURCHYSHENA, Y., Savytska, M., Lazarieva, O., Shvets, Y. V., Scarlata, G. G. M., Lynchak, O. V., & Falalyeyeva, T. M. (2026) · Minerva Gastroenterology · doi:10.23736/s2724-5985.25.04054-9 · Cited by 3
Probiotic-fortified functional foods: integrating nutrient delivery and gut health benefits
Alsanie, S. A. (2026) · Frontiers in Nutrition · doi:10.3389/fnut.2026.1815558 · Cited by 2
“Additionally, rare cases of bacteremia and fungemia have been reported in immuno-compromised patients receiving probiotic supplementation (84).”
Bohra, R., Bhardwaj, K., & Rajawat, N. K. (2026) · Nutritional Psychiatry · doi:10.1016/j.nupsyc.2026.100027 · Cited by 2
Probiotics in Human Health: Current Evidence, Mechanism of Action, and Future Perspectives
Mulaw, G., Kidanemariam, G., Bara, M., & Tesfay, T. (2026) · International Journal of Microbiology · doi:10.1155/ijm/1721210 · Cited by 3
“Note: Source: [14].”
Probiotics in the prevention and treatment of nosocomial infections
Kalabalik-Hoganson, J., Slugocki, M., & Özdener-Poyraz, E. (2021) · Elsevier eBooks · doi:10.1016/b978-0-12-823733-5.00023-4 · Cited by 2
Probiyotiklerin Ötesinde Fonksiyonel Bileşen Konseptleri: Postbiyotikler ve Paraprobiyotikler
Tatar, B., & Öztürk, H. İ. (2022) · Turkish Journal of Agriculture - Food Science and Technology · doi:10.24925/turjaf.v10i9.1747-1755.5439 · Cited by 2
Гаврилова, Н. Н., Ратникова, И. А., САДАНОВ, А. К., ОРАЗЫМБЕТ, С. Э., ШОРАБАЕВ, Е. Ж., Baimakhanova, B. B., & Protasiuk, L. E. (2023) · Research Journal of Pharmacy and Technology · doi:10.52711/0974-360x.2023.00682 · Cited by 3
Łoniewski, I., Banasiewicz, T., Sieńko, J., Skonieczna‐Żydecka, K., & Stachowska, E. (2024) · Gastroenterology Review · doi:10.5114/pg.2024.145833 · Cited by 5
Shirzad-Yazdi, N., Shorafa, E., Abootalebi, S. N., Heidari, R., Hojabri, K., Doostfatemeh, M., Masjedi, F., Vazin, A., & Shafiekhani, M. (2025) · Frontiers in Pediatrics · doi:10.3389/fped.2024.1490247 · Cited by 2
Post-transplant diarrhea in pediatric kidney transplant recipients
McBee, M. K., & Butani, L. (2025) · Pediatric Nephrology · doi:10.1007/s00467-024-06572-6 · Cited by 2
“Further caution must be taken in patients with additional risk factors such as neutropenia or those with central lines [72].”
Gut Microbiome in Liver Transplantation: From Preoperative Status to Posttransplant Outcomes
Vimalesvaran, S., Abdulla, M. A., & Kyrana, E. (2025) · Pediatric Transplantation · doi:10.1111/petr.70128 · Cited by 2
“Some recent reviews have highlighted concerns about probiotic use in certain patient populations, particularly immunosuppressed patients [52, 53].”
Ruiz, M. J., Sirini, N. E., Signorini, M. L., Etcheverría, A., Zbrun, M. V., Soto, L. P., Zimmermann, J. A., & Frizzo, L. S. (2021) · Beneficial Microbes · doi:10.3920/bm2021.0010 · Cited by 2
Probiotics as an Alternative Therapy for Helicobacter pylori-Associated Diseases
Vale, F. F., Vítor, J. M. B., & Oleastro, M. (2016) · Springer eBooks · doi:10.1007/978-4-431-55936-8_24 · Cited by 2
Gluten‑hydrolyzing probiotics: An emerging therapy for patients with celiac disease (Review)
Gayathri, D., & Alurappa, R. (2020) · World Academy of Sciences Journal · doi:10.3892/wasj.2020.55 · Cited by 2
“List of commonly available commercial probiotics for human consumption (110,111).”
BackgroundÖzdener-Poyraz, A. E., Rivkin, A. M., Iwuchukwu, O. F., & Cassino, D. (2022) · American Journal of Pharmacotherapy and Pharmaceutical Sciences · doi:10.25259/ajpps_5_2022 · Cited by 2
Psychobiotics as an Emerging Category of Probiotic Products
Choudhary, S., Shanu, K., & Devi, S. (2023) · Springer eBooks · doi:10.1007/978-981-99-1463-0_19 · Cited by 3
Киселева, М. А., Киселева, Т. Л., & Хлебников, Е. В. (2024) · Традиционная медицина · doi:10.54296/18186173_2024_3_17 · Cited by 2
Probiotics Intake as Adjunct Therapy for Infected Health-Care with SARS COV-2
Veterini, A. S., Kurniawati, E. M., Hamzah, H., Sudarmo, S. M., Prakoeswa, C. R. S., & Tinduh, D. (2021) · Indian Journal of Forensic Medicine & Toxicology · doi:10.37506/ijfmt.v15i2.15003 · Cited by 2
“But giving probiotics in severe and critical cases needs to be evaluated more deeply (10).”
BackgroundSuissa, R., Olender, T., Malitsky, S., Golani, O., Turjeman, S. C., Koren, O., Meijler, M. M., & Kolodkin‐Gal, I. (2023) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/2023.01.03.522566 · Cited by 2
“Probiotic strains are consumed either as fresh fermentation products or as dried 36 bacterial supplements with Lactobacillaceae and Bifidobacteria, being the two 37 widely used probiotic genera (1, 2).”
BackgroundPrebiotics, Probiotics and Synbiotics
Kumar, V., Rana, A., Jagtap, P., Dhewa, T., & Taneja, N. K. (2023) · Wiley eBooks · doi:10.1002/9781394229116.ch2 · Cited by 2
Implications of Probiotics and Prebiotics on Immune Functions
Pandey, K. R., & Modi, A. (2022) · Springer eBooks · doi:10.1007/978-981-16-8990-1_10 · Cited by 1
The efficacy of probiotics, prebiotics or synbiotics in scleroderma: A systematic review
Wach, A. A., Storman, D., Więckowski, K., Wojtaszek-Główka, M., Żabicka, W., Krupka, K., Abadi, A. K., Celińska‐Löwenhoff, M., & Bała, M. M. (2025) · Clinical Nutrition ESPEN · doi:10.1016/j.clnesp.2025.04.004 · Cited by 1
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Microbiome and Metabolic Immune Mechanisms in Sepsis-Associated Encephalopathy
Nan, Z. (2025) · Journal of Intensive Care Medicine · doi:10.1177/08850666251385540 · Cited by 2
Li, T.-L., Li, M., Yang, X.-M., Wei, J., & Huang, L. (2026) · Frontiers in Medicine · doi:10.3389/fmed.2026.1718333 · Cited by 1
Nutraceutical Strategies for Blood Pressure Control: Mechanisms, Evidence, and Clinical Implications
Vrcelj, T., Služek, V. B., Kiš, M. F., Waisundara, V. Y., & Banjari, I. (2026) · Nutraceuticals · doi:10.3390/nutraceuticals6020036 · Cited by 1
“Despite encouraging findings, interpretation of current evidence remains limited by substantial heterogeneity in probiotic strains, dosing regimens, treatment duration, participant characteristics, and outcome assessment across studies [93].”
Cappella, C., Redaelli, C., Balzarotti, M., Scarcia, P., Agrimi, G., & Bettiga, M. (2026) · Gut Microbes · doi:10.1080/19490976.2026.2673679 · Cited by 1
“54,55 Additional concerns include horizontal gene transfer of antimicrobial-resistance determinants and the unpredictable behavior of live microorganisms in altered host environments, particularly when administered at high doses or for prolonged periods.”
Zhu, J.-X., & Huang, G. (2026) · Frontiers in Immunology · doi:10.3389/fimmu.2026.1841979 · Cited by 1
Safety and Effectiveness of Probiotic Preparations: A Contemporary Review
Shorabaev, E., Sadanov, A. K., Baimakhanova, B. B., Ратникова, И. А., Xetayeva, G., Akhelova, S., & Turgumbayeva, A. (2026) · Diseases · doi:10.3390/diseases14090316 · Cited by 1
“…control [15,26] Limited long-term safety data in high-risk populations Uncertainty regarding rare adverse events Prospective safety studies [145,146] Differences in regulatory requirements Variability in product evaluation and quality assessment across jurisdictions International harmonization…”
Metadata
- Authors
- Didari, T., Solki, S., Mozaffari, S., Nikfar, S., & Abdollahi, M.
- Affiliations
- Islamic Azad University, Tehran (IR)
- Pharmaceutical Sciences Research Center (IR)
- Ministry of Health and Medical Education (IR)
- Venue
- Expert Opinion on Drug Safety
- Publisher
- Informa Healthcare
- Published
- 2014-01-03
- Volume
- 13
- Issue
- 2
- Pages
- 227-239
- ISSN
- 1474-0338 (ISSN-L)
- 1744-764X
- OpenAlex
- W2125631968
- Cited by
- 367
- References
- 117
- Citations by year
- 2026: 27 · 2025: 44 · 2024: 32 · 2023: 42 · 2022: 41 · 2021: 41 · 2020: 38 · 2019: 28 · 2018: 27 · 2017: 14 · 2016: 11 · 2015: 14 · 2014: 8
- FWCI
- 1.94
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Expert Opinion on Drug Safety (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
- Health Sciences › Medicine › Complementary and alternative medicine › Complementary and Alternative Medicine Studies
- Keywords
- probiotics, probiotic safety, adverse effects, sepsis, fungemia, gastrointestinal ischemia, Bifidobacterium, Lactobacillus, opportunistic infections, commensal microbiota, critically ill patients, immunocompromised patients, risk-benefit ratio
- MeSH terms
- Animals, Bifidobacterium, Humans, Lactobacillus, Safety, Probiotics, Drug-Related Side Effects and Adverse Reactions
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