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4 peer-reviewed studies
What the evidence says
Most Activated Charcoal studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from mixed-quality randomised trials published 1981–1989 with a typical study size of 99 participants.
Based on 4 studies · 4 RCTs · 116 total participants
Confidence
ModerateNewest study from 1989
Activated charcoal significantly reduced breath hydrogen and symptoms of bloating and abdominal cramps versus placebo in two populations.
Jain NK, Patel VP, Pitchumoni CS. · Am J Gastroenterol (1986)
Activated charcoal reduced the absorption of the H2-blocker nizatidine by about 30%, illustrating its broad capacity to bind co-ingested drugs.
Knadler MP, Bergstrom RF, Callaghan JT, Obermeyer BD, Rubin A. · Clin Pharmacol Ther (1987)
Oral activated charcoal prevented the large rise in flatus events and breath hydrogen that normally follows a gas-producing meal.
Hall RG Jr, Thompson H, Strother A. · Am J Gastroenterol (1981)
Activated charcoal lowered total and LDL cholesterol in a dose-dependent way (up to 29% and 41%), comparable to cholestyramine in this small cross-over study.
Neuvonen PJ, Kuusisto P, Vapaatalo H, Manninen V. · Eur J Clin Pharmacol (1989)