The most commonly cited amount of apple cider vinegar for weight loss is 1 to 2 tablespoons (15 to 30 milliliters) per day, diluted in water. That said, the honest answer is that the evidence behind ACV as a weight loss tool is thin. Even among researchers who see potential benefits, there’s no consensus on the ideal daily amount or the best time to take it. Here’s what the science actually shows and how to use ACV safely if you want to try it.
What the Research Actually Shows
Apple cider vinegar has a reputation that outpaces its evidence. The Mayo Clinic states plainly that “little research exists” to support claims that drinking a small amount before meals helps control hunger or burn calories. Harvard Health Publishing echoes this, noting that even proponents can’t agree on how much to take or when to take it.
The one well-known clinical trial, conducted in Japan in 2009, had participants drink either 1 tablespoon or 2 tablespoons of vinegar daily for 12 weeks. Both groups lost a modest amount of weight compared to the placebo group, with the higher-dose group losing slightly more. But the losses were small (a few pounds over three months), and the weight came back after participants stopped drinking vinegar. No large, high-quality study has replicated these results.
Where ACV does show more consistent effects is blood sugar control. Drinking vinegar before a meal can reduce post-meal blood sugar spikes by roughly 19% to 25%, with a stronger effect when paired with high-carbohydrate meals. Lower blood sugar spikes may reduce cravings and help with appetite regulation over time, which could indirectly support weight management. But that’s a far cry from calling ACV a weight loss supplement.
How to Take It Safely
If you want to try ACV, the standard approach is to mix 1 to 2 tablespoons into a full glass of water (about 8 ounces) and drink it before a meal. Starting with 1 tablespoon lets you gauge how your stomach handles the acidity before increasing the amount. Drinking it straight, undiluted, is a bad idea for your teeth and your throat.
The American Dental Association actually recommends against drinking ACV at all, advising people to use it only in cooking. For those who still want to drink it, their guidance is specific: dilute it with water, drink it through a straw to minimize contact with your teeth, swish plain water in your mouth afterward, and wait at least one hour before brushing. Brushing too soon after exposure to acid can accelerate enamel erosion rather than prevent it.
Some people split the dose, taking 1 tablespoon before lunch and 1 before dinner. Others take the full amount before their largest meal of the day. There’s no research showing one timing strategy works better than another.
Gummies vs. Liquid
ACV gummies have become popular as a more palatable option. They may offer some of the same benefits as liquid vinegar, such as modest effects on blood sugar and cholesterol. But there’s no concrete evidence that gummies are equivalent to drinking diluted ACV. The acetic acid content varies widely between products, and many gummies contain added sugar, which could cancel out any blood sugar benefits. If you go the gummy route, check the label for sugar content and look for brands that list the acetic acid concentration.
Who Should Be Careful
ACV can interact with several common medications, and the issue comes down to potassium. Large amounts of apple cider vinegar can lower potassium levels in the body. If you’re also taking something else that depletes potassium, the combined effect can become a problem.
- Insulin and diabetes medications: ACV can lower blood sugar on its own. Combining it with diabetes drugs could push blood sugar too low. If you take insulin, large amounts of ACV also compound the potassium-lowering effect.
- Diuretics (water pills): Many common diuretics already deplete potassium. Adding ACV to the mix increases that risk further.
- Heart medications like digoxin: Low potassium amplifies the side effects of digoxin, and ACV can contribute to that drop.
If you take any of these medications, this is worth a conversation with your pharmacist or doctor before adding daily ACV to your routine.
Keeping Expectations Realistic
ACV is not going to replace a calorie deficit. At best, it’s a minor tool that may help blunt blood sugar swings after carb-heavy meals, which could make appetite easier to manage. The amounts used in research (1 to 2 tablespoons daily) are safe for most people when properly diluted, and there’s little downside to trying it as a small addition to an overall eating plan. But if you’re expecting it to meaningfully move the scale on its own, the evidence simply isn’t there to support that.