Compound or practice · Supplement
Apple Cider Vinegar
The acetic acid modestly blunts post-meal glucose — small, real, and easy to overhype.
- Overall grade
- Grade C
- Last revised
- 2
- graded outcomes
- 0
- references listed
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
2 at grade C · 1 at grade D — 3 graded rows
What is known
Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.
- Post-meal glucoseEvidence grade C
Modest
Smallmixed
- Weight lossEvidence grade D
Negligible
Triviallow
Conditions
How the entry reads its effect on diagnosed conditions: the direction first, then the grade. Never a substitute for the person who treats you.
- Type 2 diabetes / prediabetes May improveEvidence grade CPost-meal onlyGrade C
What is uncertain
Read off the same rows as above. Nothing here is added that the entry does not itself record.
- Thin evidence: Post-meal glucose (grade C); Weight loss (grade D).
- Caution with Metformin: Additive glucose lowering.
Interactions
Documented pairings with supplements and medicines. A medicine on this list is a conversation for whoever prescribes it.
MetforminCaution
Additive glucose lowering.
The evidence in words
What it is
Apple cider vinegar (acetic acid) is a folk remedy widely used for blood sugar and weight.
How it works
Acetic acid slows gastric emptying and starch digestion, blunting the post-meal glucose spike.
What the evidence shows
Small trials show a modest reduction in post-meal glucose and slightly improved fasting glucose; weight-loss effects are trivial. Real but small — not a metabolic therapy. Undiluted vinegar erodes tooth enamel and irritates the throat.
How to use it
1–2 tablespoons diluted in water before carbohydrate meals.
Safety & interactions
Dilute it — undiluted vinegar damages enamel and the esophagus; additive glucose lowering; caution with low potassium. metformin — Additive glucose lowering.
Bottom line
A small, genuine post-meal glucose blunter, badly oversold for weight loss. Always dilute it; don't expect much.
How it is used
As the entry records it, from the studies it summarises. Not a recommendation for you — doses that suit a trial population may not suit you.
- Standard
- 1–2 tbsp diluted before carb meals.
Related reading
Entries that share this one's tags or conditions.
- Apple Cider Vinegar for Weight lossEvidence grade D — NegligibleEvidence grade D
- CinnamonA modest, inconsistent glucose helper — and a reminder that cassia cinnamon's coumarin can stress the liver at high doses.Evidence grade C
- Banaba (Corosolic Acid)A glucose-lowering leaf whose corosolic acid shows small post-meal effects in limited trials.Evidence grade C
- BerberineA plant alkaloid that behaves like a metabolic drug — real glucose and lipid effects, and it deserves drug-level caution.Evidence grade B
Sources
This entry lists no references of its own.
Last revised . A grade is this entry's reading of the evidence, not medical advice.