Years ago I saw apple cider vinegar as one of those alternative remedies with no science behind it, but nowadays I hear more and more athletes, but also non-athletes asking about it — and it turns out there may actually be some evidence to support the claims made?
The claims are sometimes quite hefty and grotesque: fat burning, better blood sugar control, even longer life. Some of them are partly true, others are still fables. In this article I explain what apple cider vinegar actually does, where the evidence stands and how to use it safely — so you can decide for yourself whether this is something for you.
First 5 of the most important points
- Acetic acid slows down the breakdown of starch, causing your blood sugar spike to be lower
- One teaspoon per day seems safe, but undiluted it can damage your tooth enamel
- Weight loss was seen in studies, but the effect is modest — about one kilogram per month
- Antimicrobial action has been demonstrated in the lab, but not yet confirmed in human trials
- Live much longer? That remains theory for now — there are no convincing studies in humans
Reason 1: What is apple cider vinegar and how is it made
Apple cider vinegar is fermented apple juice. Apples are pressed, yeast converts the sugars into alcohol, and bacteria then turn it into acetic acid. That acetic acid gives the sharp smell and sour taste — and is responsible for the biological effects we’re going to discuss.
On the pH scale, apple cider vinegar is around 2 to 3, comparable to lemon juice but significantly more acidic than water (pH 7). That makes apple cider vinegar useful, but also something to be careful with — especially regarding your teeth and esophagus.
Reason 2: Proven effects of apple cider vinegar according to research
The strongest evidence you’ll find is with apple cider vinegar blood sugar control. A meta-analysis of 25 clinical trials with over 1,300 participants shows that daily use can improve fasting blood glucose, HbA1c and triglycerides — especially in people with type 2 diabetes. Acetic acid inhibits the enzyme that breaks down starch into glucose, causing the blood sugar spike after a meal to be lower and more gradual.
Additionally, acetic acid activates AMPK, an enzyme that prompts cells to burn fat and use glucose more efficiently. This is similar to the effect of exercise and metformin, a commonly used diabetes medication. Two people eat a bagel: without vinegar blood sugar shoots from 90 to 180, with vinegar the spike stays around 140.
Pros and cons of apple cider vinegar
Pros
- Lowers blood sugar spike after carbohydrate meals
- Increases sensitivity of muscle cells to insulin
- Inexpensive and easy to obtain in supermarkets
- Safe at the recommended dosage of maximum one teaspoon per day
Cons
- Can damage tooth enamel with frequent undiluted use
- Sometimes causes stomach complaints or esophageal irritation
- Insufficient long-term safety studies (only up to 12 weeks)
- Effect on weight loss is marginal and not consistently demonstrated
Reason 3: Weight loss — modest but measurable
A Japanese double-blind trial from 2009 showed that taking vinegar for 12 weeks led to a small but statistically significant loss of body weight and fat mass: approximately 1 to 2 kilograms in three months. However, more recent meta-analyses conclude that the evidence is insufficient to give apple cider vinegar weight loss as standard advice.
So the effect may be there, but it’s more of a gentle nudge in the right direction than a miracle cure. Think of it as a small push in the right direction — it doesn’t replace proper nutrition or structured exercise.
Reason 4: Antimicrobial properties — promising in the lab
Vinegar has been used for centuries as a disinfectant and preservative. Hippocrates is said to have prescribed it for colds and wounds. In-vitro studies and animal research show that acetic acid is effective against E. coli, Staphylococcus aureus (including MRSA), Pseudomonas and even Candida fungi.
Yet solid clinical evidence in humans is lacking. The laboratory data are interesting, but so far don’t translate into demonstrable health benefits in actual infections. So it remains speculative whether apple cider vinegar actually helps with inflammation or wound healing.
Glossary
- Acetic acid: The active acid that forms during fermentation and is responsible for the biological effects of apple cider vinegar
- HbA1c: Glycated hemoglobin, a measure of average blood sugar levels over the past 2-3 months
- AMPK: Adenosine monophosphate-activated protein kinase, an enzyme that regulates fat burning and glucose uptake
- In-vitro: Research conducted in a laboratory environment, outside a living organism
Reason 5: Safe dosage and timing of use
Most trials use a maximum of 15 ml per day — about one teaspoon. Always dilute it in at least 250 ml of water. How much apple cider vinegar per day you can safely use depends on your tolerance, but it’s better not to exceed that amount.
The best time is just before a meal with carbohydrates, because acetic acid can then slow down the blood sugar spike. Use a straw to limit contact with your teeth — apple cider vinegar tooth enamel is not a myth. The acidity damages enamel, especially with repeated undiluted use.
| Dosage | Timing | Note |
|---|---|---|
| 1 teaspoon (15 ml) | Before meal with carbohydrates | Always dilute in water |
| Maximum 1x per day | Morning or evening possible | Use a straw |
| Longer than 12 weeks? | Insufficient safety data | Consult with doctor |
Possible side effects and interactions
Most people tolerate the recommended dose well. However, apple cider vinegar side effects can include an upset stomach, burning sensation in the throat or worsening of reflux symptoms. Especially those already sensitive to stomach acid should be careful.
Serious complications are rare with correct use, but long-term safety (longer than three months) has barely been studied. So discuss it with your doctor if you use medication or have underlying conditions.
Practical applications in cooking and skincare
In addition to internal use, apple cider vinegar is sometimes applied to apple cider vinegar skin — diluted as a toner or rinse. The acidity can restore your skin’s pH and inhibit acne bacteria, although clinical evidence for this is scarce.
In the kitchen it works as a flavoring in dressings and marinades. It replaces salt in recipes and may increase the bioavailability of minerals like iron. So practical applications extend beyond supplement use alone — as long as you keep dilution and frequency in mind.
Conclusion
Apple cider vinegar is not a miracle cure, but it seems to be a safe and affordable option for people struggling with blood sugar regulation or prediabetes. The strongest evidence you’ll find is there: acetic acid slows down starch digestion and improves insulin sensitivity of muscle cells.
For weight loss, antimicrobial action and anti-aging, the data remains too thin or too theoretical. Want to try it? Then stick to a maximum of one teaspoon per day, diluted in water, and preferably drink it with a straw. This way you minimize risks and make use of what science has supported so far.
Verified Sources
- Etos – Apple cider vinegar: what do you use it for? – Overview of applications, dosage and points to note (last updated Feb 4, 2025).
- Gezondheid.be – What can apple cider vinegar do for your health? – Explanation of effects on blood sugar with reference to studies.
- Consumentenbond – Healthy aspects of apple cider vinegar – Critical Q&A about claims and what is known from research.
- Healthline – 6 Health Benefits of Apple Cider Vinegar – Evidence-based overview with recent updates and FAQ.
- Verywell Health – Risks of Drinking Too Much Apple Cider Vinegar – Recent risk analysis and safety advice.
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Frequently Asked Questions
What is apple cider vinegar used for?
Mainly as a flavoring in dressings and marinades, sometimes diluted as a drink and occasionally in skincare. Always use diluted and test on skin on a small scale.
How can you drink apple cider vinegar?
Mix a small amount in a large glass of water and take it preferably with or just before the meal. Use a straw to limit contact with tooth enamel.
How much apple cider vinegar can you use?
Start with 1 teaspoon (5 ml) diluted in water and gradually build up to a maximum of 1–2 tablespoons (15–30 ml) per day, spread throughout the day and always diluted.
Are there cons to apple cider vinegar?
Possible Cons are irritation of the stomach and esophagus, enamel damage, lowered potassium levels and interactions with medication. Diluting and moderation helps limit risks.
What can apple cider vinegar do for your health?
Research points to a modest effect on blood sugar and possibly lipid profile. Results vary per person and long-term evidence is limited. Consult your doctor about conditions.
