Apple cider vinegar has a handful of genuinely promising benefits, particularly for blood sugar control, cholesterol levels, and modest weight loss. The evidence is strongest when it’s consumed in small amounts (one to two tablespoons daily, diluted in water) and weakest when it’s treated as a cure-all. Here’s what the research actually supports and what you should watch out for.
Blood Sugar Control
The most consistent benefit of apple cider vinegar is its effect on blood sugar. In an eight-week trial of people with type 2 diabetes, those who took 30 ml (about two tablespoons) of apple cider vinegar daily saw their fasting blood sugar drop by an average of 23 mg/dl. Their HbA1C, a measure of long-term blood sugar control, fell from 9.2% to 7.8%, a meaningful improvement. The control group saw no comparable change.
The mechanism appears to involve how quickly your stomach processes food. A study from Lund University found that apple cider vinegar slowed gastric emptying by roughly a third. When food moves through your stomach more slowly, sugar enters your bloodstream more gradually, which prevents the sharp spikes that follow a meal. This is useful for anyone managing blood sugar, but it comes with a serious caveat covered below.
Cholesterol and Heart Health
That same eight-week diabetes trial tracked lipid profiles and found striking results. The apple cider vinegar group saw LDL (“bad”) cholesterol drop by an average of 25 mg/dl, while the control group’s LDL barely changed. Total cholesterol dropped by 24 mg/dl in the vinegar group. The ratio of LDL to HDL cholesterol, one of the more meaningful markers for heart disease risk, also improved significantly.
Triglycerides, however, didn’t budge in either group. So apple cider vinegar appears to target cholesterol more than other blood fats. These results are notable, but they come from a single trial in people with diabetes, so it’s unclear whether the same magnitude of benefit would show up in otherwise healthy people.
Weight Loss
The weight loss effects of apple cider vinegar are real but modest. A 12-week study found that people who consumed one to two ounces of apple cider vinegar each morning lost 2 to 4 pounds and had lower triglyceride levels by the end. A separate 2018 trial reported that one to two tablespoons per day led to measurable reductions in body weight, BMI, and hip circumference.
That’s not dramatic weight loss. If you’re expecting apple cider vinegar to replace exercise or dietary changes, it won’t. But as a small addition to an already reasonable diet, it may give your results a slight nudge. The slower gastric emptying may play a role here too: when food sits in your stomach longer, you tend to feel full longer and eat less at your next meal.
How to Take It Safely
Apple cider vinegar is highly acidic, and that acidity is the source of most of its risks. The American Dental Association recommends using it only in cooking. If you choose to drink it, their guidance is specific: dilute it with water, drink it through a straw to minimize contact with your teeth, swish water in your mouth afterward, and wait at least an hour before brushing. Brushing too soon after acid exposure can actually accelerate enamel erosion because the softened enamel gets scrubbed away.
Most studies showing benefits used one to two tablespoons (15 to 30 ml) per day, mixed into a glass of water. There’s no evidence that more produces better results, and undiluted vinegar can damage your throat and esophagus.
Who Should Be Cautious
Apple cider vinegar can lower potassium levels in your body, which becomes dangerous when combined with medications that do the same thing. The list of potentially problematic drugs is longer than most people expect: insulin, metformin, injectable diabetes medications like semaglutide, diuretics (water pills) such as furosemide and hydrochlorothiazide, ACE inhibitors, ARBs, digoxin (a heart medication), and stimulant laxatives like bisacodyl.
The blood sugar interaction is particularly important. If you’re already on medication that lowers blood sugar, adding apple cider vinegar could push your levels too low. Low potassium combined with digoxin can lead to toxicity, a potentially serious complication.
The slowed gastric emptying that helps with blood sugar can backfire for people with gastroparesis, a condition where the stomach already empties too slowly. Research confirmed that apple cider vinegar significantly reduced gastric emptying rates, which would worsen symptoms like nausea, bloating, and discomfort in anyone whose stomach motility is already impaired. This is especially relevant for people with long-standing type 1 diabetes, where gastroparesis is common.