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Limited evidenceHeart & metabolic

Apple Cider Vinegar

Apple cider vinegar reliably blunts the glucose spike after a carbohydrate meal, but the long-term trials behind the health claims are small, short and low quality, and the weight-loss claims in particular are not supported. It is cheap and mostly harmless if diluted — just don't expect much.

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What the science says

  • Improves blood glucose control Limited evidence

    A 2021 meta-analysis of randomized trials found vinegar consumption modestly reduced fasting glucose and HbA1c, with the clearest signal in people with type 2 diabetes; a 2025 meta-analysis of cardiometabolic outcomes reached similar, small conclusions. Effects were on the order of a few mg/dL, the included trials were small (often 10-40 participants) and short (2-12 weeks), and blinding vinegar is essentially impossible.

  • Blunts the post-meal glucose spike Moderate evidence

    Acute crossover studies consistently show that 10-20 mL of vinegar with a high-carbohydrate meal lowers the postprandial glucose peak, plausibly by slowing gastric emptying and inhibiting disaccharidases. This is a real, reproducible short-term effect, but it has never been shown to translate into meaningful long-term glycemic or clinical benefit.

  • Causes weight loss Limited evidence

    Meta-analyses found no consistent effect of apple cider vinegar on body weight, BMI or waist circumference. Widely shared trials reporting several kilograms of loss are single small studies, often unblinded and not replicated; treat viral weight-loss claims as unsupported.

  • Lowers cholesterol Limited evidence

    Pooled analyses show small reductions in total cholesterol and triglycerides in some subgroups, with no reliable effect on LDL or HDL. Confidence intervals are wide and heterogeneity is high.

Dosage & safety

Studied doseTrials typically used 15-30 mL/day (1-2 tablespoons, roughly 750-1,500 mg acetic acid) diluted in at least 200 mL of water, taken with meals, for 8-12 weeks. There is no evidence that more is better, and undiluted vinegar should never be swallowed.
SafetyAcetic acid erodes tooth enamel — always dilute and rinse with plain water afterward. Vinegar tablets have caused esophageal burns and stricture when lodged in the esophagus. Case reports describe hypokalemia and low bone mineral density with extreme chronic intake. It delays gastric emptying, so it can worsen diabetic gastroparesis and unpredictably shift insulin timing; combined with insulin, sulfonylureas or diuretics it may add to glucose lowering or potassium loss. Avoid in active reflux, gastritis or peptic ulcer.

How to take it

TimingWith meals, especially a carbohydrate-heavy one.
With food?Always with food and diluted in at least 200 mL of water.
Worth knowingRinse with plain water afterwards but do not brush for 30 minutes — brushing acid-softened enamel does more damage than the vinegar.

Interactions

With medications

  • insulin and sulfonylureas

    It lowers postprandial glucose and delays gastric emptying, which can shift insulin timing unpredictably. monitor glucose and discuss dosing with your doctor

  • thiazide and loop diuretics

    Case reports describe hypokalaemia with heavy chronic intake, which adds to diuretic potassium loss. keep intake at 15-30 mL/day and have potassium checked if you use it long term

  • digoxin

    Low potassium from chronic heavy intake increases digoxin toxicity risk. do not use large daily volumes on digoxin

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does apple cider vinegar help you lose weight?

No — meta-analyses found no consistent effect of apple cider vinegar on body weight, BMI or waist size. Viral weight-loss results come from single small trials that have not been replicated.

Does apple cider vinegar lower blood sugar?

Apple cider vinegar blunts the glucose spike after a carbohydrate meal (moderate evidence), but its long-term effect on fasting glucose and HbA1c is small and rests on small, short trials (limited evidence).

How much apple cider vinegar should I drink a day?

Trials used 15-30 mL/day (1-2 tablespoons) of apple cider vinegar diluted in at least 200 mL of water, with meals. There is no evidence that more is better, and never swallow it undiluted.

Does apple cider vinegar damage your teeth?

Yes, acetic acid in apple cider vinegar erodes tooth enamel. Always dilute it, rinse with plain water afterwards, and wait 30 minutes before brushing.

Scientific references

Where to buy

Bragg, Organic Apple Cider Vinegar with The 'Mother', 16 fl oz (473 ml)

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