Many of my Black patients report taking apple cider vinegar to treat almost anything! Unfortunately, it’s not that simple and it doesn’t cure everything.
Apple cider vinegar has been touted for weight loss, better digestion, and lower blood sugar. Some of those claims hold up modestly; others do not. (See my article on diabetes differences in African Americans.)
What is vinegar?
Vinegar is a liquid consisting mainly of acetic acid and water. It is commonly used in cooking, cleaning, and as a natural remedy. Vinegar is produced through the fermentation of alcohol by acetic acid bacteria. It has a sour taste and a strong odor, and its acidity makes it a versatile ingredient in various culinary and household applications.
What does apple cider vinegar actually do?
Apple cider vinegar is made by fermenting apple juice, and its main active ingredient is acetic acid. Here is what the research shows:
- Blood sugar: the best-supported benefit. A review of 9 randomized trials (686 people) found apple cider vinegar lowered fasting blood sugar by about 8 mg/dL, with the biggest effect in people with type 2 diabetes who took it for more than 8 weeks (BMC Complementary Medicine and Therapies, 2021). Vinegar slows how fast the stomach empties, which blunts the sugar spike after a meal.
- Cholesterol: a small drop in total cholesterol (about 6 mg/dL) and possibly triglycerides, but no effect on LDL, the “bad” cholesterol that drives heart attacks. It is not a substitute for cholesterol medicine.
- Weight loss: modest at best. Vinegar can make you feel full for a couple of hours, and fat-burning effects have been shown mainly in animal studies. A widely shared 2024 study claiming big weight losses was retracted in 2025 over concerns about its data.
- Acid reflux and skin: no good evidence. Because it is an acid, vinegar can make heartburn worse for some people.
Black people and apple cider vinegar
With the highest rates of obesity, diabetes, and high blood pressure, Black Americans could benefit from anything that helps with weight and blood sugar. But apple cider vinegar is a helper, not a treatment. It will not replace diabetes medicine, a healthy diet, or exercise.
The precision medicine connection
Precision medicine asks how a remedy fits your body and your medicines. For Black patients, apple cider vinegar has one real advantage and a few cautions.
1. A salt-free way to add flavor
Many Black Americans are more salt-sensitive: their blood pressure rises more with salt. A splash of vinegar in greens, beans, and marinades adds the bright flavor people often reach for salt or salt pork to provide. That swap may do more for your blood pressure than drinking vinegar ever will.
2. Watch your potassium if you take a “water pill”
Guidelines often recommend a thiazide diuretic (“water pill”) such as chlorthalidone or hydrochlorothiazide as a first blood pressure medicine for Black adults. These pills lower potassium. Large amounts of apple cider vinegar have also been linked to dangerously low potassium (case report). If you take a water pill, ask your doctor to check your potassium before making vinegar a daily habit.
3. Diabetes medicines and kidney disease
If you take insulin or a sulfonylurea such as glipizide, vinegar’s blood sugar effect can add to your medicine and cause lows. Because vinegar slows stomach emptying, it can also worsen gastroparesis, a diabetes complication. And if you have kidney disease, which is more than three times as common in Black Americans, talk with your doctor before taking any daily supplement.
These are the kinds of differences covered in Better Black Health, written for patients and families, and Precision Medicine for African Americans (Springer Nature), written for clinicians.
How much apple cider vinegar should you take?
- Dose: 1 to 2 tablespoons a day. More is not better and can upset your stomach.
- Always dilute it: mix each tablespoon in a full glass of water. Straight vinegar can burn the throat and erode tooth enamel.
- Protect your teeth: drink it with a straw and rinse your mouth with water afterward.
- Take it with meals: that is when it helps blunt the blood sugar spike.
While you are working on your health, consider a multivitamin tailored for our community, like GNetX Sequence Multivitamins. It has the right amounts of vitamin D, vitamin C, zinc, magnesium, and potassium.
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