For most people, taking a small amount of apple cider vinegar every day is safe. Up to two tablespoons (about 30 mL) per day, diluted in water or mixed into food, is the range used in most clinical trials without significant side effects. A systematic review in the European Journal of Nutrition concluded that the risk of side effects at recommended quantities “seems inconsiderable.” That said, daily use does carry real risks if you drink too much, skip diluting it, or take certain medications.
How Much Is Considered Safe
Most studies use one to two tablespoons of apple cider vinegar per day, diluted in a full glass of water or incorporated into salad dressings and other foods. The Mayo Clinic notes that people have used it safely for up to 12 weeks at these amounts, and that adding it to food rather than drinking it straight may further reduce the chance of side effects.
No regulatory body has established an official safe upper limit, and high-quality long-term studies beyond 12 weeks are limited. If you plan to use it regularly, sticking to no more than two tablespoons daily and always diluting it is the practical guideline supported by existing research.
What Daily ACV May Actually Do
The strongest evidence for apple cider vinegar involves blood sugar control. A 2025 meta-analysis of controlled trials in people with type 2 diabetes found that daily intake reduced fasting blood sugar by about 22 mg/dL on average and lowered HbA1c (a marker of long-term blood sugar) by 1.53 percentage points. Those are meaningful numbers, roughly in the range of some oral diabetes medications. The mechanism is partly that vinegar slows digestion, giving your body more time to process glucose after a meal.
For weight loss, a meta-analysis of randomized controlled trials in people with type 2 diabetes or overweight found that daily ACV use for 12 weeks was associated with an average weight loss of about 7.4 kg (roughly 16 pounds) and a BMI reduction of 2 points. Those figures sound dramatic, and they should be interpreted cautiously. The studies involved specific populations, and the high variability between trials means individual results will differ widely. ACV is not a substitute for dietary changes or exercise, but it may offer a modest additional effect.
Tooth Enamel Erosion
This is the most common risk of daily use and the easiest to underestimate. Apple cider vinegar has a pH of about 3.7, making it nearly as acidic as Coca-Cola (pH 3.5). Lab research comparing acidic beverages found that apple cider vinegar and plain vinegar caused the most severe enamel demineralization of all samples tested, worse than lemon juice, energy drinks, or soft drinks. A 2012 case report linked daily apple cider vinegar consumption directly to erosive tooth wear.
To protect your teeth, never sip undiluted ACV. Dilute it well, drink it through a straw to minimize contact with your teeth, and rinse your mouth with plain water afterward. Avoid brushing your teeth immediately after, since acid-softened enamel is more vulnerable to abrasion. Waiting 20 to 30 minutes before brushing is a reasonable precaution.
Throat and Digestive Risks
Undiluted vinegar is corrosive. A case report documented an adolescent who drank a vinegar beverage daily without sufficient dilution (100 to 150 mL each morning for about a month) and developed severe esophageal ulcers, with multiple areas of bleeding and tissue destruction visible on endoscopy. Other case reports have specifically noted esophageal injury from apple cider vinegar. The lesson is straightforward: always dilute, and never take large amounts.
Even in diluted form, vinegar slows the rate at which your stomach empties. For most people this is harmless and may even help with blood sugar control. But if you have gastroparesis (delayed stomach emptying), which is common in people with long-standing diabetes, daily ACV can make the problem worse. A pilot study in people with type 1 diabetes and gastroparesis found that apple cider vinegar significantly slowed their already delayed gastric emptying, and one participant reported more frequent episodes of low blood sugar during two weeks of daily use.
Low Potassium and Bone Health
At typical doses, potassium depletion from ACV is unlikely. But in large amounts over long periods, it becomes a real concern. A case report in a patient consuming large quantities of cider vinegar documented dangerously low potassium levels along with osteoporosis. This is an extreme scenario, but it illustrates why exceeding two tablespoons per day or using ACV as a primary “health treatment” for months on end without monitoring is unwise.
Medications That Don’t Mix Well With ACV
If you take any of the following medications, daily apple cider vinegar use deserves extra caution:
- Insulin and other diabetes drugs. ACV lowers blood sugar on its own, so combining it with diabetes medication could push your levels too low, especially if you’re not monitoring regularly.
- Diuretics (water pills). Drugs like furosemide and hydrochlorothiazide already increase potassium loss. Adding ACV, which can also lower potassium, raises the risk of dangerous depletion.
- Digoxin. This heart medication becomes more toxic when potassium levels drop. Since ACV can contribute to low potassium, the combination increases the chance of side effects from digoxin.
- ACE inhibitors and ARBs. These blood pressure medications affect potassium balance, and adding ACV to the mix can make levels less predictable.
The interaction risk is highest in people who consume large amounts of ACV or use concentrated supplement forms rather than diluted liquid vinegar.
How to Use It Safely Every Day
If you want to make apple cider vinegar part of your daily routine, a few simple habits minimize the risks. Stick to one to two tablespoons per day. Dilute it in at least a full glass of water, or use it in cooking and dressings. Drink it through a straw and rinse your mouth with water afterward. Don’t take it on a completely empty stomach if you notice digestive discomfort.
Avoid concentrated ACV supplements like tablets or gummies, which can deliver unpredictable doses and have caused reports of throat burns when tablets lodge in the esophagus. Liquid vinegar, properly diluted, gives you the most control over how much you’re actually consuming.