Apple Cider Vinegar for Blood Sugar: How Much Did the Studies Use?
Written by the Glyco Reset editorial team
Last updated · Who reviewed this page · How we write and review
Trials in adults with type 2 diabetes used 13.75 to 30 mL of apple cider vinegar a day, about 1 to 2 tablespoons, for 4 to 12 weeks. A clear fasting sugar effect showed up only above about 10 mL a day. Glyco Reset publishes no amounts, and its whole 60 ml bottle equals 2 to 4 days of a study dose.
How much apple cider vinegar did blood sugar studies use?
Far more than a few drops. Trials in adults with type 2 diabetes used 13.75 to 30 mL of apple cider vinegar a day, most often 15 or 20 mL, for 4 to 12 weeks (Arjmandfard et al., 2025).
One tablespoon is about 15 mL and one teaspoon about 5 mL, so that is roughly 1 to 2 tablespoons a day. The key studies are lined up below.
| Study | Who took part | Daily amount | How long | What it found |
|---|---|---|---|---|
| Dose review, 2025 | 463 adults with type 2 diabetes, 7 trials | 13.75-30 mL | 4-12 weeks | Fasting sugar about 22 mg/dL lower; clear only above about 10 mL a day |
| Review, 2021 | 686 adults, 9 trials | Reported as 15 mL and up | 30-90 days | Fasting sugar about 8 mg/dL lower; HbA1c change not robust |
| Review, 2018 | Small trials, people with diabetes | Not verified per trial | 8-12 weeks | HbA1c about 0.39 points lower |
| Trial, 2023 | 73 adults with type 2 diabetes finished | 30 mL with or after lunch | 8 weeks | HbA1c fell; fasting sugar gap not significant |
| Pilot, 2007 | 11 adults with type 2 diabetes | 2 tablespoons at bedtime | 2 days per test | Morning sugar up to about 6% lower |
| Meal test, 2020 | 12 healthy adults | 25 g in water, one meal | Single meal | After-meal rise 31% lower; tablets did nothing |
What did the longer apple cider vinegar trials in type 2 diabetes find?
They found small to moderate drops in fasting blood sugar, and smaller changes in HbA1c. The 2025 review linked vinegar to fasting sugar about 22 mg/dL lower, but it called the trials few, small and short.
A 2021 review of 9 trials found a smaller average drop, about 8 mg/dL. It said the HbA1c result was not robust and that several trials had a high risk of bias (Hadi et al., 2021).
HbA1c shows your average blood sugar over about three months. Pooled small trials found it fell by about 0.39 points after 8 to 12 weeks of vinegar, and the authors asked for larger, better-planned trials (Siddiqui et al., 2018).
What did the 30 mL lunch trial show?
An 8-week trial gave adults with type 2 diabetes 30 mL a day with or after lunch. HbA1c and cholesterol fell more than with diet advice alone, but the fasting sugar difference between groups was not significant (Jafarirad et al., 2023).
The trial had no placebo, everyone knew their group, and the vinegar was homemade.
How long did apple cider vinegar studies last?
Between one meal and three months. Nothing in this research shows what happens after a year of daily vinegar.
- 1 meal
Liquid versus tablets
Healthy adults took liquid vinegar or tablets with a high-carb meal.
- 2 nights
Bedtime vinegar pilot
Eleven adults with type 2 diabetes took 2 tablespoons with a bedtime snack.
- 4-12 weeks
Daily trials in type 2 diabetes
Seven trials gave 13.75 to 30 mL a day and tracked fasting sugar and HbA1c.
- 30-90 days
The widest review
Nine trials of different sizes and quality were pooled together.
What did the single-meal and bedtime vinegar tests show?
Both showed a short-term effect at a full spoon-sized dose. In a small pilot, 2 tablespoons with an ounce of cheese at bedtime lowered morning blood sugar by up to about 6% (White et al., 2007).
Only 11 people took part, and the researchers said bigger studies were needed.
Do vinegar tablets work like liquid vinegar?
Not in the one head-to-head test we found. Liquid vinegar in water cut the after-meal blood sugar rise by 31%, while four commercial vinegar tablets did not (Feise et al., 2020).
The liquid dose held 1.25 g of acetic acid, the main active compound in vinegar. Form and amount both change the result.
What are the limits of apple cider vinegar research?
The evidence is early. The trials were small, short, often unblinded, and they used different vinegars and doses.
Small groups
The biggest review pooled 686 people across 9 trials.
Short follow-up
No trial in this set ran past about 12 weeks.
Bias risk
Some trials had no placebo, and people knew what they were taking.
No product trials
None of these studies tested a sweetened vinegar drop.
Our apple cider vinegar and blood sugar guide covers timing, dilution and who should skip vinegar altogether.
How does Glyco Reset compare with the vinegar study doses?
We cannot say exactly, because no amount is published. Glyco Reset lists six ingredients, and apple cider vinegar is only one of them, next to purified water, pure cane sugar, apple pectin, citric acid and sodium citrate.
The bottle size still allows simple math. The whole 60 ml bottle would equal only 2 to 4 days of a study dose even if it were pure vinegar.
| Daily trial dose | Days one 60 ml bottle would cover if it were pure vinegar |
|---|---|
| 15 mL (about 1 tablespoon) | 4 days |
| 20 mL | 3 days |
| 30 mL (about 2 tablespoons) | 2 days |
The Glyco Reset ingredients page explains each of the six ingredients and what is not published.
Is daily apple cider vinegar safe at study doses?
Vinegar is an acid, even at study doses. It can wear down tooth enamel, so never sip it undiluted, and rinse your mouth with water afterward.
Vinegar may also interact with insulin and water pills (diuretics), and that mix can lead to low potassium (Mayo Clinic, 2025).
Very large amounts over a long time carry more risk. One woman who drank about 250 mL of cider vinegar a day for about six years developed low potassium and weak bones (Lhotta et al., 1998). That is a single case, at many times a trial dose.
How do you compare a supplement label with a vinegar study?
Put the label amount and the study amount in the same unit. Then check the form and the length.
- 1
Find the amount
Look for apple cider vinegar or acetic acid in the Supplement Facts panel, per serving.
- 2
Convert the unit
Turn the serving into mL. One teaspoon is about 5 mL and one tablespoon about 15 mL.
- 3
Compare the dose
Set it next to 15 to 30 mL a day, and the 10 mL level where effects began.
- 4
Check the form
Liquid vinegar worked in a meal test while whole tablets did not.
- 5
Check the length
Trials ran 4 to 12 weeks. A few days of use is not the same test.
What do the vinegar study doses mean for Glyco Reset buyers?
They mean you should treat Glyco Reset as a small daily vinegar habit, not as a study-strength dose. Its claims are “Supports Healthy Glucose Utilization*” and “Support Healthy Blood Sugar Levels”, and no study has tested the finished drops.
It is not a diabetes treatment and does not replace insulin, metformin or any medicine.
Several different formulas also sell under the same name, so check the ingredient list on your bottle. Our post on which Glyco Reset formula you are looking at shows how. If you still like the idea of a dropper routine, the Glyco Reset pricing page explains the 1, 3 and 6 bottle packs and the 60-day money-back window.
Apple cider vinegar study doses: common questions
Questions people type into Google and Bing, answered from the label and the sources on this page.
What vinegar amounts did blood sugar studies use?
Most trials in adults with type 2 diabetes used 13.75 to 30 mL a day, with 15 or 20 mL the most common. That is roughly 1 to 2 tablespoons a day, taken for 4 to 12 weeks.
Is 1 tablespoon of apple cider vinegar enough?
One tablespoon is about 15 mL, which sits inside the range most trials used. Those trials found modest changes, and none showed that vinegar can treat diabetes or replace medicine.
How many mL is 2 tablespoons of apple cider vinegar?
About 30 mL. That matches the top of the daily range in the diabetes trials and the bedtime amount in a small 2007 pilot study.
How long did apple cider vinegar diabetes studies last?
The longer trials ran 4 to 12 weeks, or 30 to 90 days in one review. Some tests lasted only one meal or two nights, so they say nothing about long-term use.
Can a few drops of apple cider vinegar do anything?
No study we found tested a few drops. A 2025 review saw a clear fasting blood sugar effect only above about 10 mL a day, which is about 2 teaspoons.
Is more apple cider vinegar better for blood sugar?
Not past the amounts that were studied. One woman who drank about 250 mL a day for years developed low potassium and weak bones, and more acid also means more wear on your teeth.
Do vinegar tablets match liquid vinegar in studies?
Not in the one direct test we found. Liquid vinegar cut the after-meal blood sugar rise by 31%, while four whole vinegar tablets did not.
How much does apple cider vinegar lower fasting glucose?
Reviews found average drops of about 8 mg/dL across mixed trials and about 22 mg/dL in adults with type 2 diabetes. HbA1c changes were small, about 0.39 points at most.
What are the limits of apple cider vinegar research?
The trials were few, small and short, and several had a high risk of bias. Some were unblinded or used homemade vinegar, and no trial has tested a finished vinegar supplement.