Evidence

Apple Cider Vinegar and Blood Sugar: What the Trials Actually Found

Quick answer

In pooled trials, apple cider vinegar was linked to small drops in fasting glucose, about 8 mg/dL across 9 trials and about 22 mg/dL in people with type 2 diabetes. Those trials used about 15-30 mL of vinegar a day for weeks, and many were small or at high risk of bias. Glyco Reset publishes no vinegar amount, so the results cannot be applied to it directly.

Written by the Glycoresetformula editorial teamUpdated October 12, 2026 · 9 min read

The brand's ingredient graphic. Apple cider vinegar is listed first, but no tile shows an amount.

The short answer

Does apple cider vinegar affect blood sugar?

Somewhat, in trials, and by small amounts. A 2021 review of 9 randomized trials found fasting glucose about 7.97 mg/dL lower with apple cider vinegar than without it (Hadi 2021 ACV meta-analysis).

Vinegar has more trial data than many glucose-support ingredients. But the effects were modest and the trials small.

Memorial Sloan Kettering calls the evidence "not conclusive" because studies differ in design, dose and formulation (MSKCC: Apple cider vinegar monograph).

Can any of it tell you what Glyco Reset drops will do? No, and the reason is a missing number.

The big reviews

What did the apple cider vinegar meta-analyses find?

Three reviews pooled the trial data, and all three found small changes. Fasting glucose fell by about 8 to 22 mg/dL, and HbA1c by about 0.4 to 0.5 points.

Pooled results from vinegar reviews (sources linked in each row)
Review	Who was studied	Daily vinegar	Main result
Hadi 2021 (Hadi 2021 ACV meta-analysis)	9 randomized trials, 686 people	15-770 mL for 30-90 days	Fasting glucose about 7.97 mg/dL lower; HbA1c about 0.50 lower; no change in HOMA-IR or fasting insulin
Arjmandfard 2025 (Arjmandfard 2025 ACV meta-analysis (T2D))	7 controlled trials, 463 people with type 2 diabetes	13.75-30 mL for 4-12 weeks	Fasting glucose about 21.9 mg/dL lower (moderate certainty); HOMA-IR unchanged
Siddiqui 2018 (Siddiqui 2018 vinegar & diabetes review)	Vinegar trials in diabetes	Varied	HbA1c 0.39% lower after 8-12 weeks

HbA1c reflects average blood sugar over recent months, and your doctor sets your targets. The Siddiqui authors said larger trials are needed before vinegar can even be considered an add-on (Siddiqui 2018 vinegar & diabetes review).

Type 2 diabetes

Is the vinegar evidence stronger for people with type 2 diabetes?

The fasting glucose change was bigger in people with type 2 diabetes, about 21.9 mg/dL, but the trials behind it were weaker. The 2025 review rated most of them at high risk of bias (Arjmandfard 2025 ACV meta-analysis (T2D)).

Risk of bias means the way a trial was run could tilt its result. Most of those trials were also run in Iran, so results may not carry over to other diets.

WebMD says post-meal blood sugar changes from vinegar are "not likely to be meaningful for most people who have diabetes" (WebMD: Apple cider vinegar).

NCCIH says most supplements lack evidence of benefit for diabetes, and it warns never to replace medical treatment with an unproven product (NCCIH: Diabetes and dietary supplements). The ADA does not recommend supplements unless a deficiency is diagnosed (ADA: Vitamins & supplements).

After meals

Does vinegar change blood sugar after a meal?

In some meal tests, yes, mainly after starchy, high-glycemic meals. After a low-glycemic meal, vinegar made no clear difference (Liatis 2010 vinegar in type 2 diabetes).

The high-GI versus low-GI test

Liatis and colleagues gave 16 people with type 2 diabetes a meal with or without vinegar. After a high-GI meal, the 2-hour glucose area fell from 311 to 181 mmol·min/L. After a low-GI meal, it barely moved, 238 versus 229, and the gap was not significant (Liatis 2010 vinegar in type 2 diabetes).

Why it might happen

In 10 healthy adults, adding vinegar to white bread lowered both glucose and insulin responses. Slower stomach emptying was the likely cause (Liljeberg & Bjorck 1998 vinegar gastric emptying).

The 2 tablespoon studies

Science News reported that Carol Johnston's group gave 29 volunteers 2 tablespoons of vinegar, roughly 30 mL, before a high-carbohydrate breakfast. The first-hour glucose rise fell by about half in people with prediabetes (Science News on Johnston vinegar studies). That is news coverage of small groups, not the original paper.

The dose

What amount of apple cider vinegar did the studies use?

Most trials used about 15 to 30 mL of vinegar a day for 4 to 12 weeks (Hadi 2021 ACV meta-analysis) (Arjmandfard 2025 ACV meta-analysis (T2D)).

Trial vinegar amounts next to one bottle (bottle size from product images)
Low trial dose	About 13.75-15 mL a day (Arjmandfard 2025 ACV meta-analysis (T2D)) (Hadi 2021 ACV meta-analysis)
High common trial dose	About 30 mL a day (Arjmandfard 2025 ACV meta-analysis (T2D))
Whole Glyco Reset bottle	60 mL of all ingredients combined
Vinegar per Glyco Reset serving	Not published

Even a bottle of pure vinegar would cover only 2 to 4 days at trial rates. More on the ingredient itself: apple cider vinegar in Glyco Reset.

Try Glyco Reset for 60 daysLiquid drops · 2 oz / 60 mL per bottle · price shown at secure checkout

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Drops versus trials

Why can't Glyco Reset drops be compared with the vinegar trials?

Because the one number you need is missing. Glyco Reset lists apple cider vinegar first but prints no amount, and no serving size is published online.

A fair comparison needs three facts: vinegar per serving, its strength, and how often you take it. None of the three is published.

The bottle is 2 fl oz (60 mL), shared by vinegar, purified water, pure cane sugar, apple pectin, citric acid and sodium citrate.
The brand graphic tells you to take the serving "as directed on the label", with no number.

So a dropper serving likely holds far less vinegar than a trial day, though that is an inference, not a fact. The drops also add sugar and pectin, which no trial tested. See every known fact on the label page.

The brand's how-it-works graphic calls the formula a "proprietary blend". It names six ingredients and shows no amounts or serving size.

Limits

What are the limits of the apple cider vinegar research?

Most trials were small, many were at high risk of bias, and they used different vinegars in different amounts (Arjmandfard 2025 ACV meta-analysis (T2D)) (MSKCC: Apple cider vinegar monograph).

What the evidence does show

Small average changes in fasting glucose across pooled trials
A small HbA1c change after 8-12 weeks
Lower after-meal glucose with starchy, high-GI meals

What it does not show

Any change in insulin resistance (HOMA-IR)
Effects after low-GI meals
Any result for Glyco Reset or other vinegar drops

There is a safety side too: regular use of pure vinegar can harm teeth and throat (WebMD: Apple cider vinegar). The ACV safety article covers it.

Next steps

What should you do with the vinegar evidence?

Treat it as interesting but limited. Keep your care plan and talk with your doctor before adding any vinegar product.

Talk to your doctor first
RxList lists a moderate interaction between vinegar and diabetes medicines, with a risk of low blood sugar (RxList: ACV interactions). The medicines page lists the others.
Read the bottle you receive
Check the name, ingredients and directions; other formulas share the name.

Plain habits have stronger evidence: the CDC's lifestyle program cut type 2 diabetes risk by 58% (CDC: Prediabetes, prevent type 2). See the blood sugar guide.

FAQ

Apple cider vinegar and blood sugar FAQ

What did studies find about apple cider vinegar and fasting glucose?

In pooled trials, only a little. A 2021 meta-analysis of 9 trials found fasting glucose about 7.97 mg/dL lower (Hadi 2021 ACV meta-analysis). In people with type 2 diabetes, a 2025 review found about 21.9 mg/dL lower, but most trials were at high risk of bias (Arjmandfard 2025 ACV meta-analysis (T2D)).

How much apple cider vinegar a day was used in studies?

Most trials used about 15 to 30 mL of vinegar a day, roughly 1 to 2 tablespoons, for 4 to 12 weeks (Hadi 2021 ACV meta-analysis) (Arjmandfard 2025 ACV meta-analysis (T2D)). Those are study amounts, not a recommended dose.

Does apple cider vinegar lower A1C?

A small change was seen. One review found HbA1c about 0.50 lower (Hadi 2021 ACV meta-analysis), and another found 0.39% lower after 8-12 weeks, with authors calling for larger trials (Siddiqui 2018 vinegar & diabetes review). Your doctor sets your A1C targets.

How much vinegar is in Glyco Reset drops?

It is not published. The brand names apple cider vinegar first among six ingredients but prints no amount and no serving size. The whole bottle is 60 mL of all ingredients combined, while trials used 15-30 mL of vinegar a day.

Can apple cider vinegar replace diabetes medication?

No. NCCIH warns never to replace medical treatment for diabetes with an unproven product (NCCIH: Diabetes and dietary supplements), and RxList lists a risk of low blood sugar when vinegar is combined with diabetes medicines (RxList: ACV interactions). Talk to your doctor before adding vinegar.

Why do experts say the vinegar evidence is not conclusive?

Because the trials differ in design, dose and type of vinegar, as Memorial Sloan Kettering notes (MSKCC: Apple cider vinegar monograph). Many were small, short and at high risk of bias.

Who wrote this

Written and reviewed by

Written byThe Glycoresetformula editorial teamGlycoresetformula, licensed U.S. retail desk for Glyco Reset

A small team that reads every Glyco Reset image, listing and public source line by line, checks each claim against NIH, NCCIH, NIDDK, CDC, ADA, FDA, FTC and peer-reviewed research, and rewrites it in plain English. We do not write for the manufacturer, and we update a page whenever the label, the prices or the evidence changes.

Medically reviewed byDr. Edward Rico, MD, MBA, FACE, MD, PhysicianRole: Medical reviewerReview date: October 13, 2026

Last updated October 12, 2026. Read about our editorial standards and how we check reviews. This website is run by a licensed U.S. retail desk, not by the manufacturer. We are paid a commission when you buy through our order links.

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