The most effective approach is to dilute 1 to 3 teaspoons of apple cider vinegar in a full glass of water and drink it before a meal, once daily. That simple routine captures the core of what clinical research has tested, but the details of timing, dose, and preparation matter for both results and safety.
How Much to Use
A 2024 randomized, placebo-controlled study published in BMJ Nutrition tested three doses of apple cider vinegar (containing 5% acetic acid) in overweight young adults: roughly 1 teaspoon, 2 teaspoons, and 1 tablespoon, each diluted in about 8 ounces of water and consumed daily for 12 weeks. All three groups lost significantly more weight than the placebo group, with reductions in BMI starting as early as week four. The weight loss appeared dose-dependent, meaning the tablespoon dose produced the largest changes in body weight, BMI, and blood markers like triglycerides and blood sugar.
That said, MD Anderson Cancer Center recommends capping your intake at one tablespoon mixed into 8 ounces of water, tea, or another liquid, no more than once per day. If you’re new to it, starting with a teaspoon and working up over a week or two gives your stomach time to adjust.
How to Mix and Drink It
Never drink apple cider vinegar straight. Undiluted vinegar is acidic enough to damage the lining of your esophagus and erode tooth enamel over time. The standard preparation is simple: stir your chosen dose into a full 8-ounce glass of water. Some people find the taste easier in warm water with a squeeze of lemon, or mixed into herbal tea. The liquid itself doesn’t matter much as long as the vinegar is fully diluted.
In the BMJ study, participants drank their diluted vinegar in the morning on an empty stomach. Other research and clinical guidelines suggest taking it shortly before or with a meal, which may help slow the rate at which food leaves your stomach, reducing blood sugar spikes after eating. Either approach has support. Pick whichever fits your routine and feels comfortable on your stomach.
Protecting Your Teeth
Even diluted, apple cider vinegar is acidic enough to soften enamel with repeated exposure. The American Dental Association recommends four precautions: dilute it with water, drink it through a straw to minimize contact with your teeth, swish plain water around your mouth afterward, and wait at least one hour before brushing. Brushing too soon while enamel is still softened from the acid can cause more damage, not less.
Liquid Vinegar vs. Gummies and Pills
Most apple cider vinegar gummies contain about 500 milligrams of dried vinegar powder per gummy. That’s a tiny fraction of the liquid doses used in weight loss research, which typically range from 1 teaspoon to 1 tablespoon of actual vinegar. A 2020 randomized controlled study found that liquid vinegar reduced post-meal blood sugar 31% more than vinegar tablets, and tablets dissolved in water still didn’t match the liquid form. No current studies have tested gummies specifically for weight loss or blood sugar effects.
If you’re choosing apple cider vinegar for its potential metabolic benefits, liquid is the only form with meaningful clinical evidence behind it. Look for raw, unfiltered varieties with “the mother” (the cloudy strand of proteins and bacteria from fermentation), though filtered versions contain the same acetic acid.
Why It Might Help With Weight
The active ingredient is acetic acid, which makes up about 5% of apple cider vinegar. In animal studies, acetic acid activates an enzyme that acts as a metabolic switch: it dials down the body’s fat-producing machinery and ramps up fat burning. Mice fed high-fat diets alongside acetic acid showed lower triglycerides, less body fat accumulation, and better insulin sensitivity, even when their calorie intake stayed the same.
Acetic acid also slows gastric emptying, the speed at which food moves from your stomach into your small intestine. This can blunt blood sugar spikes after meals and may help you feel full longer. The effect is modest, though. The weight lost in clinical trials amounts to a few pounds over 12 weeks. Apple cider vinegar works as a small, complementary habit layered onto a broader approach to eating and activity, not as a stand-alone solution.
Who Should Be Cautious
The same gastric-emptying effect that helps with blood sugar can be a problem if you have gastroparesis, a condition where your stomach already empties too slowly. Adding vinegar on top of that can worsen nausea, bloating, and discomfort.
Apple cider vinegar can also lower potassium levels. If you already have low potassium (hypokalemia) or take medications that affect potassium, like diuretics or certain blood pressure drugs, this is a real concern. It can also interact with insulin and other blood sugar-lowering medications, potentially pushing levels too low. If you take any of these, check with your doctor before adding a daily vinegar habit.
For most people, the main risks are digestive upset and dental erosion, both of which proper dilution and the straw-and-rinse routine largely prevent. If you notice nausea, heartburn, or stomach pain, reduce your dose or try taking it with food instead of on an empty stomach.