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Aged Black Garlic Side Effects & Safety

Evidence:Moderate
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Mild garlic breath or body odor (significantly less than raw garlic)
  • Rare: mild heartburn or nausea
  • Very rare: allergic reaction in individuals with garlic allergy
  • Overall extremely well-tolerated compared to raw garlic supplements

Drug & Supplement Interactions

  • Blood thinners (warfarin, aspirin, clopidogrel) — garlic has mild antiplatelet effects; monitor INR if on warfarin
  • HIV protease inhibitors (saquinavir) — garlic may reduce saquinavir plasma levels; avoid combination
  • Antihypertensive medications — additive blood pressure lowering effect; monitor blood pressure
  • Pre-surgery — discontinue 7-10 days before elective surgery due to antiplatelet activity

Maximum Dose

Do not exceed: Clinical trials have used up to 2400mg/day without significant adverse effects

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References

  1. Meta-analysisRied K (2020). Garlic lowers blood pressure in hypertensive subjects, improves arterial stiffness and gut microbiota: A review and meta-analysis. Experimental and Therapeutic Medicine. DOI PubMed
  2. RCTRied K, Travica N, Sali A (2018). The effect of Kyolic aged garlic extract on gut microbiota, inflammation, and cardiovascular markers in hypertensives. Frontiers in Nutrition. DOI PubMed
  3. RCTNantz MP, Rowe CA, Muber CE, et al. (2012). Supplementation with aged garlic extract improves both NK and gamma-delta T cell function and reduces the severity of cold and flu symptoms. Clinical Nutrition. DOI PubMed
  4. RCTSerrano JCE, Castro-Boqué E, García-Carrasco A, Morán-Valero MI, et al. (2023). Antihypertensive Effects of an Optimized Aged Garlic Extract in Subjects with Grade I Hypertension and Antihypertensive Drug Therapy: A Randomized, Triple-Blind Controlled Trial.. Nutrients. DOI PubMed
  5. RCTJung ES, Park SH, Choi EK, Ryu BH, et al. (2014). Reduction of blood lipid parameters by a 12-wk supplementation of aged black garlic: a randomized controlled trial.. Nutrition (Burbank, Los Angeles County, Calif.). DOI PubMed