Of all the claims made about apple cider vinegar, its effect on blood sugar has the most research behind it. That research is real, but the effects are modest, the studies are small, and nearly all of them used liquid vinegar at meals.
Written by Vita Globe Editorial Team | Reviewed against meta-analyses and peer-reviewed clinical trials
Does apple cider vinegar lower blood sugar?
Modestly, in studies using liquid vinegar. Taken with a meal, vinegar lowers the blood sugar and insulin rise afterward[1]. Over weeks, a meta-analysis of nine trials found fasting glucose fell by about 8 mg/dL on average[2]. These are small effects, not a substitute for diabetes care.
Caveat: The studies are small and used tablespoon-level liquid doses. ACV gummies haven't been tested for blood sugar.
Sources: Shishehbor 2017 · Hadi 2021 · Verified 2026-09-27
IN THIS ARTICLE
What happens to blood sugar after a meal with vinegar?
This is the most consistent finding. A 2017 meta-analysis pooled controlled trials that gave people vinegar with a meal and compared their blood sugar and insulin with a control meal. Vinegar significantly reduced both the glucose and insulin response[1]. The authors suggested vinegar may be a useful add-on for managing post-meal blood sugar.
Individual studies add detail:
- In a small 2004 trial, vinegar taken before a high-carbohydrate meal improved insulin sensitivity after the meal, with the clearest effect in people with insulin resistance[3].
- In healthy adults, about two teaspoons of vinegar at mealtime lowered the post-meal blood sugar rise by about 20% compared with placebo. The effect was stronger at mealtime than five hours earlier, and there was no effect when the meal was simple sugar rather than starch[4].
Want the practical version of this? See Best Time to Take Apple Cider Vinegar Gummies, which also covers a small bedtime study.
Does apple cider vinegar affect fasting glucose or A1C?
A 2021 meta-analysis looked at nine randomized trials with 686 participants who took apple cider vinegar over several weeks[2]. It found:
| Measure | Result |
|---|---|
| Fasting blood glucose | Down about 8 mg/dL on average (significant) |
| HbA1c (A1C) | Down about 0.5%, but the result depended on individual studies |
| Fasting insulin | No significant change |
| Insulin resistance (HOMA-IR) | No significant change |
| Total cholesterol | Small decrease (significant) |
The authors concluded apple cider vinegar "might" benefit blood sugar and lipids, and urged caution given the limitations of the studies[2]. For context, an 8 mg/dL change in fasting glucose is small next to what diabetes medications and lifestyle changes typically achieve.
How might vinegar affect blood sugar?
Researchers have proposed a few mechanisms, mostly involving acetic acid:
- Slower stomach emptying. If food leaves the stomach more slowly, sugar enters the blood more gradually. A pilot study in people with type 1 diabetes and gastroparesis found apple cider vinegar slowed gastric emptying[5].
- More glucose uptake by muscle. In people with type 2 diabetes, vinegar increased insulin-stimulated glucose uptake in forearm muscle after a meal[6].
These mechanisms help explain why effects show up around meals, and why the carbohydrate in the meal matters.
What are the limits of this research?
- Small, short studies. Many trials had a few dozen participants or fewer and lasted from a single meal to a few months.
- Liquid doses. Studies generally used 10 to 30 grams of vinegar, often diluted in water, with or right before meals.
- Safety data are thin. A systematic review of apple vinegar found limited evidence on long-term safety and noted side effects such as throat irritation with undiluted or tablet forms[7].
Important: if you take insulin or medication that lowers blood sugar, talk to your doctor before adding vinegar products, because the effects could add up. And if you have gastroparesis, the slowed stomach emptying seen in research is a reason for caution[5].
Do ACV gummies lower blood sugar?
We don't know, because they haven't been tested. Here's why it's hard to assume they'd work the same way: a tablespoon of vinegar contains roughly 750mg of acetic acid, while many ACV gummies list 500mg of total apple cider vinegar per serving without saying how much acetic acid that includes. The gummy dose is almost certainly lower.
Gummies also come in regular (with sugar) and sugar-free versions. If blood sugar is your main concern, it makes sense to avoid adding sugar with your supplement. We compare the two in Sugar-Free vs. Regular ACV Gummies, and look at the formats in Apple Cider Vinegar: Liquid vs. Gummies.
The honest summary
- Liquid vinegar with a starchy meal modestly lowers the blood sugar and insulin rise afterward.
- Over weeks, fasting glucose fell about 8 mg/dL on average in pooled trials; insulin and insulin resistance didn't change significantly.
- The studies are small, short and used gram-level liquid doses.
- ACV gummies haven't been tested and likely provide less acetic acid.
- Vinegar isn't a diabetes treatment. Talk to your doctor if you take glucose-lowering medication.
Our option
Vita Globe Sugar Free Apple Cider Vinegar Gummies with The Mother
If you're watching sugar, this is our sugar-free ACV option: apple cider vinegar with "the Mother" plus vitamin B12, keto-friendly, vegan and gluten-free. Chew 2 once daily. It's a routine-friendly way to include ACV, not a blood sugar treatment.
Frequently asked questions
How much does apple cider vinegar lower blood sugar?
In pooled trials, fasting glucose dropped about 8 mg/dL on average[2]. After a single meal, one study found about a 20% smaller blood sugar rise with two teaspoons of vinegar[4].
Can apple cider vinegar replace diabetes medication?
No. The effects are modest and don't replace medical treatment. Never stop or change medication without your doctor.
Is apple cider vinegar safe for people with diabetes?
Many people with diabetes use vinegar in food, but check with your care team before using supplements, especially with insulin or if you have gastroparesis[5][7].
Do ACV gummies work for blood sugar like liquid vinegar?
There's no research showing they do. Their acetic acid content is likely much lower than the liquid doses studied.
Does apple cider vinegar lower A1C?
One meta-analysis found about a 0.5% reduction, but the result depended heavily on individual studies[2]. It's not a reliable effect to count on.
Sources
- Shishehbor F, Mansoori A, Shirani F. Vinegar consumption can attenuate postprandial glucose and insulin responses; a systematic review and meta-analysis of clinical trials. Diabetes Res Clin Pract. 2017;127:1-9. doi:10.1016/j.diabres.2017.01.021
- Hadi A, Pourmasoumi M, Najafgholizadeh A, Clark CCT, Esmaillzadeh A. The effect of apple cider vinegar on lipid profiles and glycemic parameters: a systematic review and meta-analysis of randomized clinical trials. BMC Complement Med Ther. 2021;21(1):179. doi:10.1186/s12906-021-03351-w
- Johnston CS, Kim CM, Buller AJ. Vinegar improves insulin sensitivity to a high-carbohydrate meal in subjects with insulin resistance or type 2 diabetes. Diabetes Care. 2004;27(1):281-282. doi:10.2337/diacare.27.1.281
- Johnston CS, Steplewska I, Long CA, Harris LN, Ryals RH. Examination of the antiglycemic properties of vinegar in healthy adults. Ann Nutr Metab. 2010;56(1):74-79. doi:10.1159/000272133
- Hlebowicz J, Darwiche G, Björgell O, Almér LO. Effect of apple cider vinegar on delayed gastric emptying in patients with type 1 diabetes mellitus: a pilot study. BMC Gastroenterol. 2007;7:46. doi:10.1186/1471-230X-7-46
- Mitrou P, Petsiou E, Papakonstantinou E, et al. Vinegar consumption increases insulin-stimulated glucose uptake by the forearm muscle in humans with type 2 diabetes. J Diabetes Res. 2015;2015:175204. doi:10.1155/2015/175204
- Launholt TL, Kristiansen CB, Hjorth P. Safety and side effects of apple vinegar intake and its effect on metabolic parameters and body weight: a systematic review. Eur J Nutr. 2020;59(6):2273-2289. doi:10.1007/s00394-020-02214-3
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
