Quick answer
No study has shown an effect from apple cider vinegar pills, so there is no timeline to expect. What has been measured: acetic acid from capsules, tracked in the blood as acetate, peaked about 30 minutes after a dose and was gone within 2 hours, and daily trials of liquid vinegar ran for 4 to 12 weeks.1,2
Key facts
- Acetate from a vinegar drink peaked at 15 minutes and was back to its starting level by 90 minutes.1
- The tablet comparison study tracked participants for 60 minutes after a meal.3
- A pooled analysis of 10 daily trials found none that used vinegar powder capsules.2
- A 2020 systematic review called for larger and longer studies before conclusions can be drawn.4
Within hours: what reaches the blood
After a vinegar drink, acetate in the blood peaked at 15 minutes and was back to its starting level by 90 minutes. After capsules with the same 750 mg of acetic acid, it rose more slowly, peaked at 30 minutes and returned to baseline by 120 minutes.1
Acetate is what acetic acid becomes once it is absorbed, so this curve shows when a capsule's acid arrives, not whether it does anything. Over three hours, the total from capsules came to about 80% of the drink's, a gap that was not statistically significant. The study was run by a vinegar company.1
Within the hour after a meal
The one study that compared tablets with liquid vinegar at a meal measured each participant at 30 and 60 minutes after eating, on four separate days a week apart. Liquid vinegar changed the result within that hour. Tablets swallowed whole did not, and crushed tablets dissolved in water landed in between.3
That makes the honest answer for pills unusual: within the window where liquid vinegar showed an effect, whole tablets showed none. Waiting longer for a single dose to act is not supported by anything we found.3
Over weeks: what the longer trials measured
Trials of daily liquid vinegar lasted 4 to 12 weeks, and a 2020 systematic review called for larger and longer studies before firm conclusions can be drawn.2,4
The longer trials gave liquid vinegar, or an effervescent tablet, to adults taking part because of their weight or a medical condition. A 2025 analysis pooling ten of them reported small differences in body weight, mostly at 30 mL of liquid a day, and it counted a trial that the journal later retracted.2,5
None of that tells you how long a capsule of vinegar powder takes, because no capsule of vinegar powder was among the products tested.2
How long can you take them?
We found no safety study of vinegar pills lasting more than a few weeks. Daily liquid vinegar has been studied for up to 12 weeks, and no tolerable upper intake level has been set.2,4
Problems tied to long or heavy use come from liquid vinegar: worn enamel in a teenager who drank a glass every day, and low potassium in a person who drank large amounts. Neither involved pills, but both are reasons not to raise the dose or stretch use indefinitely without asking a doctor.6,7
If you take medicine for blood sugar
The hour after a meal is when liquid vinegar's effect showed up: it lowered the rise in blood sugar by 31% in 12 healthy adults, while whole tablets did not. If you use insulin or another medicine that lowers blood sugar, ask your doctor before adding vinegar in any form.3
Questions people ask
How long can you take apple cider vinegar pills?
There is no study of long-term pill use. Liquid vinegar has been taken daily for up to 12 weeks in trials. Ask your doctor before long-term use, especially if you take medicines.2
When will I notice a difference?
No study has measured a noticeable effect from pills, so we cannot give a time. Acetate from a capsule peaks in the blood at about 30 minutes and is back to its starting level by about 2 hours.1
Is the acid in pills absorbed faster than from the liquid?
No, more slowly. In the absorption study, acetate peaked 15 minutes after a vinegar drink and 30 minutes after capsules with the same amount of acetic acid.1
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Sources
- Sugiyama S, Fushimi T, Kishi M, et al. Bioavailability of acetate from two vinegar supplements: capsule and drink. J Nutr Sci Vitaminol (Tokyo). 2010;56(4):266-9. Opened 2026-10-01.
- Castagna A, Ferro Y, Noto FR, et al. Effect of Apple Cider Vinegar Intake on Body Composition in Humans with Type 2 Diabetes and/or Overweight: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutrients. 2025;17(18):3000. Opened 2026-10-01.
- Feise NK, Johnston CS. Commercial Vinegar Tablets Do Not Display the Same Physiological Benefits for Managing Postprandial Glucose Concentrations as Liquid Vinegar. J Nutr Metab. 2020;2020:9098739. Opened 2026-10-01.
- 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. Opened 2026-10-07.
- Abou-Khalil R, Andary J, El-Hayek E. Apple cider vinegar for weight management in Lebanese adolescents and young adults with overweight and obesity: a randomised, double-blind, placebo-controlled study. BMJ Nutr Prev Health. 2024;7(1):61-67. Retracted: BMJ Nutr Prev Health. 2025;8(2):693. Opened 2026-10-01.
- Gambon DL, Brand HS, Veerman EC. Unhealthy weight loss. Erosion by apple cider vinegar. Ned Tijdschr Tandheelkd. 2012;119(12):589-591. Article in Dutch. Opened 2026-10-07.
- Lhotta K, Höfle G, Gasser R, Finkenstedt G. Hypokalemia, hyperreninemia and osteoporosis in a patient ingesting large amounts of cider vinegar. Nephron. 1998;80(2):242-243. Opened 2026-10-07.
This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.