How much apple cider vinegar should I drink a day?

Most studies use 1 to 2 tablespoons (15–30 mL) diluted in a large glass of water, taken once or twice daily with meals. There is no benefit to drinking more, and higher amounts increase the risk of throat irritation, tooth enamel erosion, and digestive upset.

Does apple cider vinegar help you lose weight?

The effect is modest at best. A few small trials found slightly greater weight or waist reduction when ACV was added to a calorie-controlled diet, likely because vinegar increases fullness and slightly slows stomach emptying. It is not a weight-loss shortcut and works only as a minor addition to diet and exercise.

Is it better to drink apple cider vinegar before or after meals?

For blood-sugar benefits, taking diluted ACV just before or with a carbohydrate-containing meal is best, since its main effect is blunting the post-meal glucose spike. Always dilute it and avoid drinking it on a completely empty stomach if it causes discomfort.

Can apple cider vinegar damage your teeth?

Yes. Undiluted vinegar is acidic enough to erode tooth enamel over time. Always dilute it in water, consider drinking through a straw, rinse your mouth with plain water afterward, and avoid brushing immediately after.

Who should not take apple cider vinegar?

People with gastroparesis, severe acid reflux, low potassium, or those taking diuretics, insulin, or certain diabetes and heart medications should be cautious and check with a clinician. ACV can lower potassium and add to blood-sugar-lowering drugs.

Apple Cider Vinegar: What the Science Actually Says About Benefits, Uses & Side Effects

Apple cider vinegar (ACV) is one of the most popular natural health remedies in the world, credited online with everything from melting belly fat to curing acid reflux. Some of those claims have a kernel of scientific truth. Many do not. This guide separates the evidence from the hype so you can decide whether ACV deserves a place in your routine — and how to use it without hurting yourself.

What apple cider vinegar actually is

Apple cider vinegar is made by crushing apples, fermenting the sugars into alcohol with yeast, and then fermenting that alcohol into acetic acid with bacteria. Acetic acid — typically around 5% of the final product — is the active ingredient behind most of ACV's effects.

"Raw" or "unfiltered" versions also contain the mother, a cloudy mix of proteins, enzymes, and beneficial bacteria. While the mother is often marketed as the source of ACV's power, there is little direct human evidence that it adds meaningful benefit beyond the acetic acid itself.

The strongest evidence: blood sugar

If ACV has one genuinely well-supported use, it is blunting the rise in blood sugar after a meal.

Multiple small studies show that consuming 1–2 tablespoons of vinegar with a carbohydrate-rich meal reduces the post-meal blood glucose and insulin spike, typically by 20–30% in the hours afterward.
The likely mechanism is twofold: acetic acid slows gastric emptying (so glucose enters the bloodstream more gradually) and may improve insulin sensitivity in muscle tissue.
A frequently cited bedtime study found that 2 tablespoons of ACV before bed modestly lowered fasting glucose the next morning in people with type 2 diabetes.

This makes ACV a reasonable, low-cost adjunct for people working on blood-sugar control — but it is an addition to, not a replacement for, the fundamentals. If you're interested in the bigger picture of natural glucose support, cinnamon and berberine have their own bodies of evidence, and our guide to type 2 diabetes covers the foundations.

Important: If you take insulin or other glucose-lowering medication, adding ACV can push your blood sugar too low. Coordinate with your prescriber and monitor closely.

Weight and appetite: real but small

The "ACV melts fat" claim is overblown, but it isn't pure fiction.

A 2009 Japanese trial found that participants drinking vinegar daily for 12 weeks lost slightly more weight and abdominal fat than the placebo group — but the difference was around 1–2 kg, achieved alongside a calorie-controlled diet.
A 2018 study pairing ACV with a reduced-calorie diet showed modestly greater weight loss and appetite suppression than dieting alone.

The realistic takeaway: vinegar can increase satiety and slightly reduce how much you eat at a meal. That can support a weight-loss effort, but it will not move the needle on its own. For a deeper dive into food-based approaches, see our piece on fibermaxxing and gut health.

Digestion, cholesterol, and the rest

Claim	What the evidence says
Improves digestion / "low stomach acid"	Largely anecdotal; no strong human trials. May help some, irritate others.
Lowers cholesterol	Limited animal data and a few small human studies; not established.
Cures acid reflux	No good evidence; can worsen reflux in many people.
Kills harmful bacteria	True for surface/food cleaning; unproven as an internal "detox."
Clears skin / treats acne	No reliable evidence; undiluted ACV can chemically burn skin.

How to use apple cider vinegar safely

If you want to try it, the method matters more than the brand:

Always dilute. Mix 1–2 tablespoons (15–30 mL) into a large glass of water. Never drink it straight.
Take it with meals, especially carbohydrate-containing ones, for the blood-sugar effect.
Protect your teeth. Drink through a straw, rinse with plain water afterward, and don't brush for at least 30 minutes.
Start low. Begin with a single teaspoon to see how your stomach reacts.
Don't exceed 1–2 tablespoons daily. More is not better and raises the risk of side effects.

Side effects and who should be careful

ACV is generally safe in food-like amounts, but real risks exist:

Tooth enamel erosion from the acidity.
Throat and esophageal irritation, especially undiluted.
Worsened reflux in some people, despite claims to the contrary.
Low potassium (hypokalemia) and reduced bone density have been reported with chronic, excessive intake.
Delayed stomach emptying, which is genuinely harmful for anyone with gastroparesis.

Use caution or avoid if you take diuretics, insulin or other diabetes drugs, digoxin, or have low potassium, chronic kidney disease, or significant reflux. Because ACV can interact with medications, it's worth running it through our interaction checker or asking a professional before making it a daily habit.

The bottom line

Apple cider vinegar is a legitimately useful, inexpensive tool for one main thing: gently blunting post-meal blood sugar spikes. It may offer minor appetite and weight benefits as part of a broader diet. Beyond that, most of the dramatic internet claims aren't backed by good science — and using it carelessly (undiluted, in large amounts) can damage your teeth and throat.

Treat it as a small, optional addition to a healthy lifestyle, not a miracle cure.

Curious whether apple cider vinegar fits your specific health picture or medications? Ask Mother Nature for free, private, evidence-based guidance any time.