Garlic (Allium sativum) has been used for centuries as a prophylactic and therapeutic medicinal agent. Importantly, garlic has
been suggested to have both cancer-preventive potential as well as significant enhancing effects on the immune system. While these
observations are supported experimentally both in vitro and in vivo, the impact of garlic in assisting the immune system in the prevention
of cancer still lacks experimental confirmation. Studies addressing the immunomodulatory effects of garlic reveal conflicting data as to
pro- or anti-inflammatory responses depending on the particular experimental set-ups and the garlic preparation used (i.e. garlic extract
versus chemically pure garlic compounds). Here we provide an overview of the chemistry of the major garlic organosulfur compounds,
summarize the current understanding and propose a link between the immunomodulating activity of garlic and the prevention of cancer.
We hypothesize that garlic rather elicits anti-inflammatory and anti-oxidative responses that aid in priming the organism towards
eradication of an emerging tumor.
Keywords: Anti-inflammatory, anti-oxidant, cancer prevention, disulfide, garlic, immunomodulatory.
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