Yes, you can drink apple cider vinegar, and most people do so safely in small amounts diluted with water. The typical range is 1 to 2 tablespoons per day, mixed into a full glass of water. Drinking it undiluted or in large quantities can damage your teeth, irritate your throat, and cause digestive problems.
How Much Is Safe to Drink
Most research uses between 1 and 2 tablespoons (15 to 30 mL) per day, split across meals. Studies looking at blood sugar improvements saw benefits at about 1.5 tablespoons after a meal. Weight loss trials used around 2 tablespoons daily, one before lunch and one before dinner. For acid reflux, a smaller dose of 1 to 2 teaspoons in warm water after a meal is more common.
Always dilute it. A full glass of water per tablespoon is a reasonable ratio. Drinking it straight exposes your throat and esophagus to a highly acidic liquid with a pH around 3.1, which is strong enough to cause tissue irritation and, with repeated exposure, ulceration of the upper digestive tract. Using a straw also helps keep the acid away from your teeth.
Effects on Blood Sugar
Apple cider vinegar’s most consistently supported benefit is its effect on blood sugar. A meta-analysis of trials in people with type 2 diabetes found that daily intake reduced fasting blood sugar by an average of about 22 mg/dL, a meaningful drop. The acetic acid in vinegar appears to slow how quickly your stomach empties after a meal, which spreads out the sugar absorption. It also seems to reduce the liver’s production of glucose and help muscles take up more sugar from the bloodstream.
This blood sugar effect is a double-edged sword. If you take insulin or diabetes medications, adding apple cider vinegar on top could push your blood sugar too low. The slowed stomach emptying can make it harder to predict when food will hit your system, complicating insulin timing.
Weight Loss: What the Data Shows
A systematic review of randomized controlled trials in people with type 2 diabetes or excess weight found that daily apple cider vinegar intake led to a statistically significant reduction in body weight. The pooled results showed an average loss of about 7.4 kg (roughly 16 pounds) over interventions lasting 4 to 12 weeks, which worked out to about 9.4% of starting body weight. The effective dose in most of these studies was 30 mL (2 tablespoons) per day.
Those numbers come from participants who were overweight, obese, or had type 2 diabetes, so the results may not translate the same way for someone at a healthy weight. Apple cider vinegar isn’t a replacement for changes in diet and activity, but the evidence suggests it can be a modest and low-cost addition.
Tooth Enamel Erosion
The acid in vinegar dissolves tooth enamel. Lab studies on human enamel samples show that vinegar causes measurable mineral loss that increases with exposure time. One organic vinegar (pH 3.1) caused the greatest mineral damage, with up to 20% mineral loss penetrating 45 micrometers deep after 8 hours of contact. In real life, you’re not soaking your teeth for hours, but sipping undiluted vinegar daily adds up over months and years.
Drinking through a straw, diluting well, and rinsing your mouth with plain water afterward all reduce the risk. Avoid brushing your teeth immediately after drinking it, since enamel softened by acid is more vulnerable to abrasion from a toothbrush. Waiting 20 to 30 minutes before brushing is a safer approach.
Digestive Concerns and Gastroparesis
Because apple cider vinegar slows gastric emptying, it can cause nausea, bloating, or a feeling of uncomfortable fullness, especially at higher doses. For most people, this is mild and temporary. For people with gastroparesis, a condition where the stomach already empties too slowly, vinegar makes the problem significantly worse.
A pilot study in people with type 1 diabetes and gastroparesis found that apple cider vinegar further reduced their already slow gastric emptying rate. One participant reported more frequent episodes of dangerously low blood sugar during the two-week vinegar period. If you have gastroparesis or frequently feel food sitting in your stomach for hours, apple cider vinegar is likely to aggravate those symptoms.
Potassium Levels and Bone Health
Excessive long-term use of apple cider vinegar can lower potassium levels. A clinical case report documented a patient who consumed large amounts of cider vinegar over time and developed hypokalemia (dangerously low potassium), elevated renin levels, and osteoporosis. This is an extreme case, but it highlights that more is not better. Sticking to 1 to 2 tablespoons a day avoids this territory for most people.
Medication Interactions to Watch
Apple cider vinegar interacts with several common medications, primarily through its effect on potassium and blood sugar:
- Diuretics (water pills): Both diuretics and apple cider vinegar can lower potassium. Taking them together increases the risk of potassium dropping to unsafe levels.
- Insulin and diabetes medications: The combined blood sugar lowering effect can cause hypoglycemia.
- Digoxin: This heart medication becomes more dangerous when potassium is low. Large amounts of apple cider vinegar can push potassium down enough to amplify digoxin’s side effects.
Liquid vs. Tablets
Apple cider vinegar supplements in tablet form carry their own risks. Testing of popular tablet brands in the U.S. found that acid concentrations in some products were 3 to 10 times higher than regular household vinegar. Because a tablet sits in one spot as it dissolves, it can cause concentrated acid burns to the esophagus. Liquid vinegar, when properly diluted, spreads out and passes through more quickly. If you choose to drink apple cider vinegar, the diluted liquid form gives you more control over the dose and reduces the risk of localized tissue damage.
What “The Mother” Actually Is
Unfiltered apple cider vinegar contains a cloudy substance called “the mother,” which is a colony of acetic acid bacteria and yeast. The dominant species is Acetobacter pasteurianus, making up roughly 67 to 72% of the bacterial community. Organic versions tend to have more microbial diversity, with four bacterial species identified compared to two in conventional varieties. Several yeast species are also present.
These are acetic acid bacteria, not the same types of bacteria found in probiotic supplements or fermented foods like yogurt and kimchi. Whether the mother provides meaningful gut health benefits in humans hasn’t been established. It won’t hurt you, but the health effects of apple cider vinegar come primarily from the acetic acid itself, not the bacterial culture.
When to Drink It
Timing depends on what you’re hoping to get from it. For blood sugar control, drinking it with or shortly after a meal aligns with how most studies were designed. For weight management, the research showing results used a dose before lunch and another before dinner. Taking it on an empty stomach in the morning is a popular wellness trend, but there isn’t specific research supporting that timing over mealtime use, and some people find it causes more nausea on an empty stomach.