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Apple Cider Vinegar Side Effects & Safety

Evidence:Emerging
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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: Safe with Caution

Potential Side Effects

  • Tooth enamel erosion if consumed undiluted (always dilute and use a straw)
  • Esophageal irritation or burns from undiluted consumption
  • Nausea, especially on an empty stomach
  • May worsen gastroparesis due to delayed gastric emptying
  • Hypokalemia with chronic excessive use

Drug & Supplement Interactions

  • Insulin and sulfonylureas — may enhance hypoglycemic effects; monitor blood sugar
  • Digoxin — chronic ACV use may lower potassium, increasing digoxin toxicity risk
  • Diuretics — combined potassium-lowering effect with chronic ACV use

Maximum Dose

Do not exceed: 2 tablespoons (30ml) per day; higher amounts increase side effect risk

Full Apple Cider Vinegar Guide

References

  1. RCTJohnston CS, Kim CM, Buller AJ. (2004). Vinegar improves insulin sensitivity to a high-carbohydrate meal in subjects with insulin resistance or type 2 diabetes. Diabetes Care. DOI PubMed
  2. RCTKondo T, Kishi M, Fushimi T, et al. (2009). Vinegar intake reduces body weight, body fat mass, and serum triglyceride levels in obese Japanese subjects. Bioscience, Biotechnology, and Biochemistry. DOI PubMed
  3. Meta-analysisTehrani SD, Keshani M, Rouhani MH, Moallem SA, et al. (2025). The Effects of Apple Cider Vinegar on Cardiometabolic Risk Factors: A Systematic Review and Meta-analysis of Clinical Trials.. Current medicinal chemistry. DOI PubMed
  4. Meta-analysisCastagna A, Ferro Y, Noto FR, Bruno R, et al. (2025). Effect of Apple Cider Vinegar Intake on Body Composition in Humans with Type 2 Diabetes and/or Overweight: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.. Nutrients. DOI PubMed
  5. Meta-analysisHadi A, Pourmasoumi M, Najafgholizadeh A, Clark CCT, et al. (2021). The effect of apple cider vinegar on lipid profiles and glycemic parameters: a systematic review and meta-analysis of randomized clinical trials.. BMC complementary medicine and therapies. DOI PubMed
  6. Arjmandfard D, Behzadi M, Sohrabi Z, Mohammadi Sartang M (2025). Effects of apple cider vinegar on glycemic control and insulin sensitivity in patients with type 2 diabetes: A GRADE-assessed systematic review and dose-response meta-analysis of controlled clinical trials.. Frontiers in nutrition. DOI PubMed
  7. Baker B, Herforth C, Low J, Craig R, et al. (2025). Apple cider vinegar for prevention of urinary lithiasis (APUL): a randomized crossover trial.. International urology and nephrology. DOI PubMed
Show 3 more references
  1. Weber I, Woolhiser E, Keime N, Wasvary M, et al. (2023). Clinical Efficacy of Nutritional Supplements in Atopic Dermatitis: Systematic Review.. JMIR dermatology. DOI PubMed
  2. Cobb KM, Chavez DA, Kenyon JD, Hutelin Z, et al. (2021). Acetic Acid Supplementation: Effect on Resting and Exercise Energy Expenditure and Substrate Utilization.. International journal of exercise science. DOI PubMed
  3. Ahmadniaye Motlagh H, Javadmanesh A, Safari O (2020). Improvement of non-specific immunity, growth, and activity of digestive enzymes in Carassius auratus as a result of apple cider vinegar administration to diet.. Fish physiology and biochemistry. DOI PubMed