Cited by 680Garlic and Onion StudiesChemical synthesis and alkaloidsGenomics, phytochemicals, and oxidative stress

Clarifying the real bioactive constituents of garlic

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Amagase, Harunobu·2006·The Journal of Nutrition

Abstract

Compounds in garlic work synergistically to produce various effects, but, because of garlic's chemical complexity, processing methods yield preparations with differing efficacy and safety. Although thiosulfinates such as allicin have been long misunderstood to be active compounds due to their characteristic odor, it is not necessary for garlic preparations to contain such odorous compounds to be effective, and they decompose and disappear during any processing. Garlic exhibits hypolipidemic, antiplatelet, and procirculatory effects. It prevents cold and flu symptoms through immune enhancement and demonstrates anticancer and chemopreventive activities. In addition, aged garlic extract possesses hepatoprotective, neuroprotective, antioxidative activities, whereas other preparations may stimulate oxidation. Additional effects may be caused by S-allylcysteine, S-allyl mercaptocysteine), saponins, Nalpha-fructosyl arginine, and other substances formed during a long-term extraction process. Although not all of active ingredients of garlic are known, and allicin-like transient components are not directly active, ample research suggests that an allicin-free garlic preparation that is standardized with a bioavailable component such as S-allylcysteine, is active and various effects of garlic may be attributed to it. Furthermore, various chemical constituents in garlic products, including nonsulfur compounds such as saponins, may contribute to the essential biological activities of garlic. Further studies are needed to confirm their bioavailability and associated activities.

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Authors
Amagase, H.
Corresponding author
Amagase, Harunobu
Venue
The Journal of Nutrition
Publisher
Elsevier BV
Published
2006-03
Volume
136
Issue
3
Pages
716S-725S
ISSN
0022-3166 (ISSN-L)
OpenAlex
W1943303117
Cited by
680
References
80
Citations by year
2026: 19 · 2025: 33 · 2024: 31 · 2023: 27 · 2022: 42 · 2021: 54 · 2020: 37 · 2019: 39 · 2018: 32 · 2017: 34 · 2016: 46 · 2015: 48 · 2014: 41 · 2013: 42 · 2012: 37
FWCI
1.66
Type
journal article
Language
en
Open access
Locations
  • Journal of Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Garlic and Onion Studies
  • Physical Sciences › Chemistry › Organic Chemistry › Chemical synthesis and alkaloids
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
Keywords
garlic, bioactive compounds, allicin, thiosulfinates, S-allylcysteine, saponins, aged garlic extract, garlic processing, hypolipidemic effect, antiplatelet activity, anticancer activity, chemoprevention, hepatoprotection, neuroprotection, antioxidant activity, immune enhancement, bioavailability
MeSH terms
Complementary Therapies, Antioxidants, Pharmaceutical Preparations, Garlic, Humans, Hypercholesterolemia, Oils, Volatile, Plant Extracts, Plants, Medicinal, Safety

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