Most people drink 1 to 2 tablespoons of apple cider vinegar per day, diluted in water. That range appears consistently across clinical studies and dietitian recommendations, though the ideal amount depends on what you’re using it for. There are no official dosage guidelines, so the practical answer comes from research trials and safety limits.
General Starting Dose
If you’re new to drinking apple cider vinegar, start with 1 teaspoon diluted in 8 ounces of water and work up from there. The most common daily amount used in studies is 1 to 2 tablespoons (roughly 15 to 30 mL), split into one or two servings. A prominent researcher at Arizona State University who has studied vinegar for years recommends keeping total daily intake at 4 tablespoons or less.
Every tablespoon should be mixed into at least 8 ounces of water. Drinking it undiluted is a bad idea: the acetic acid (typically 4 to 5 percent in commercial bottles) can irritate your throat, damage the lining of your esophagus, and erode tooth enamel over time. Some practitioners are more conservative and suggest capping intake at 1 tablespoon per day in 8 ounces of water.
Doses Used in Weight Studies
A 2024 clinical trial published in BMJ Nutrition tested three different daily doses in overweight young adults: 5 mL (about 1 teaspoon), 10 mL (about 2 teaspoons), and 15 mL (about 1 tablespoon). Each dose was mixed into a cup of water and taken in the morning on an empty stomach for 12 weeks. All three groups lost a significant amount of weight compared to the placebo group, with reductions in body weight, BMI, waist circumference, hip circumference, and body fat ratio. Even the smallest dose produced measurable changes by week 4.
Earlier trials in Japan found similar results at higher amounts. Participants drinking 15 or 30 mL daily (1 to 2 tablespoons) for 12 weeks saw reduced body weight, BMI, and blood triglycerides. Another study using 30 mL per day alongside a calorie-restricted diet found significant drops in body weight, BMI, and appetite scores. The takeaway: even small amounts can have an effect, but most weight-related research clusters around 1 to 2 tablespoons daily.
Doses for Blood Sugar and Digestion
For blood sugar management, the studied dose is slightly smaller. Research showing improved blood sugar levels after meals used about 1.5 tablespoons taken after eating. A common practical recommendation from dietitians is 1 to 2 tablespoons in 8 ounces of water, taken right before meals. The acetic acid slows the rate at which your stomach empties food into the small intestine, which blunts the spike in blood sugar that follows a carb-heavy meal.
For digestive comfort, the doses are smaller still. The Canadian Digestive Health Foundation suggests 1 to 2 teaspoons in a cup of hot water, taken with meals or as a warm “tea.” For acid reflux specifically, 1 to 2 teaspoons in a mug of warm water after a meal is a commonly cited amount. These lower doses make sense because you’re not trying to shift your metabolism over weeks; you’re trying to ease a single meal through your system.
How to Protect Your Teeth and Throat
Apple cider vinegar is acidic enough to soften tooth enamel with repeated direct contact. The American Dental Association recommends four precautions: dilute it in water, drink it through a straw so it bypasses your teeth, swish plain water around your mouth afterward, and wait at least one hour before brushing. Brushing too soon can scrub away enamel that the acid has temporarily softened.
Beyond your teeth, undiluted or highly concentrated vinegar can irritate the esophagus. If you notice a burning sensation in your throat or chest, you’re either using too much vinegar per glass or not diluting enough. Cutting back to 1 teaspoon per 8 ounces of water usually solves it.
Who Should Be Careful
Apple cider vinegar can interact with several common medications, primarily by affecting potassium levels or blood sugar. If you take insulin, metformin, or injectable diabetes drugs like semaglutide, adding vinegar could push your blood sugar too low. The combination isn’t necessarily dangerous, but it requires awareness and possibly adjusted timing.
Diuretics (water pills) prescribed for high blood pressure or fluid retention already carry a risk of dropping your potassium too low. Large amounts of apple cider vinegar can do the same thing, and combining the two compounds that risk. The same potassium concern applies if you take digoxin for heart failure or irregular heart rhythm, since low potassium increases the chance of digoxin side effects. Stimulant laxatives used frequently can also lower potassium, making the combination with daily vinegar worth discussing with a pharmacist.
ACE inhibitors and ARBs (two common classes of blood pressure medication) have the opposite potassium problem: they can raise potassium levels. Adding apple cider vinegar, which can lower potassium, creates an unpredictable push and pull on your potassium balance. If you take any of these medications regularly, checking with your prescriber before starting a daily vinegar habit is worthwhile.
Quick Reference by Goal
- General wellness: 1 tablespoon in 8 ounces of water, once daily
- Weight management: 1 to 2 tablespoons in water, taken before or between meals, for at least 12 weeks
- Blood sugar support: 1 to 2 tablespoons in 8 ounces of water, right before meals
- Digestion or reflux: 1 to 2 teaspoons in a cup of water or warm water, with or after meals
- Daily upper limit: No more than 4 tablespoons total