spec sheet7 rows
Activated charcoal is carbon processed to an enormous internal pore surface; in medicine it is swallowed to adsorb ingested poisons and drugs before they cross the gut wall.
- Enormous internal pore surface per single gram
- Swallowed to adsorb ingested poisons before absorption
- A real emergency intervention in poisoning
- Purely physical binding inside the gut lumen
- Cheap, shelf stable and keeps for years
- Activated charcoal has no receptor, enzyme or transporter target; it works purely by physical adsorption of luminal contents, so 'mechanism of action' questions have a physical rather than pharmacological answer [1].
- The 2021 Clinical Toxicology Recommendations Collaborative systematic review screened 22,950 titles and found 83% of the 559 included studies to be Low or Very Low GRADE, yet still reported benefit beyond one hour post-ingestion in many clinical scenarios, softening the old 'useless after 60 minutes' rule [3].
- The largest randomised trial, 4,632 self-poisoning patients in Sri Lanka, found no mortality reduction from multiple-dose activated charcoal in a mixed-ingestion population [5], whereas the earlier single-toxin yellow-oleander trial did show benefit [6]; the toxin matters more than the charcoal.
- Charcoal does not adsorb metals such as iron and lithium, alcohols, corrosives or hydrocarbons, and giving it in those ingestions adds risk without benefit [1].
- No study has ever established the optimal dose for either single-dose or multiple-dose activated charcoal, which is a striking gap for a therapy in use for over a century [3].
Mechanism
Adsorption here is physical rather than chemical. A gram of activated charcoal carries on the order of a thousand square metres of pore surface, and non-polar organic molecules stick to it by van der Waals forces. It works only on what is still in the gut lumen, and it does not meaningfully bind alcohol, iron, lithium, cyanide, strong acids or alkalis, which is why the hangover and detox marketing does not follow from the pharmacology. It will also adsorb any other drug taken at the same time, including oral contraceptives.
receptor fingerprint
No molecular target: non-specific physical adsorption onto a microporous carbon surface (typically 900-2000 m2/g)Binds unabsorbed drug or toxin in the gastrointestinal lumen by van der Waals adsorption, preventing systemic absorption
Enterohepatic and enteroenteric recirculation ('gut dialysis')Repeated dosing maintains a lumen-to-blood concentration gradient that pulls already-absorbed drug back across the gut wall
Poorly adsorbed species: metals (iron, lithium), alcohols, strong acids and alkalis, hydrocarbonsNo meaningful binding; charcoal is inert against ionic and small polar molecules
Safetyrisks and cautions, not medical advice
Activated Charcoal is a single molecule in the gastrointestinal class. A full adverse effect profile has not been compiled for this entry yet, so nothing here should be read as evidence that it is well tolerated; the absence is missing work rather than a finding. What is documented is what the compound is and what it is used for.
Subjective profileweighing the evidence above
Almost every jar sold for wellness is sold on a mechanism that does not apply to it. Adsorption stops at the gut wall, so nothing already in the blood is touched, and alcohol, iron, lithium and the strong acids and alkalis barely bind at all; the detox and hangover claims are an emergency department indication borrowed for marketing. The genuine hazard of casual use is the opposite of what buyers expect, because the same indiscriminate binding strips whatever else is in the stomach, oral contraceptives included. In poisoning it is a real intervention with a narrow time window, which makes it a hospital decision rather than a cupboard staple.
Where to buy
Suppliers
Vendors carrying Activated Charcoal, with live product details and codes. Links are affiliate links that support the wiki at no cost to you.
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Activated Charcoal
Research
- 1997first citedPosition statement: single-dose activated charcoal. American Academy of Clinical Toxicology; Eu…
- 2008controlled trialMultiple-dose activated charcoal in acute self-poisoning: a randomised controlled trial.
- 2026most recentRecommendations from the Clinical Toxicology Recommendations Collaborative on the administratio…
- 1.Position paper: Single-dose activated charcoal.
- 2.Position statement: single-dose activated charcoal. American Academy of Clinical Toxicology; European Association of Poisons Centres and Clinical Toxicologists.
- 3.Systematic review on the use of activated charcoal for gastrointestinal decontamination following acute oral overdose.
- 4.Recommendations from the Clinical Toxicology Recommendations Collaborative on the administration of activated charcoal in acute oral overdose.
- 5.Multiple-dose activated charcoal in acute self-poisoning: a randomised controlled trial.
- 6.Multiple-dose activated charcoal for treatment of yellow oleander poisoning: a single-blind, randomised, placebo-controlled trial.
- 7.Activated Charcoal and Poisoning: Is It Really Effective?
7 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
Notes and cautions
- The serious harm from activated charcoal is pulmonary aspiration, which can cause charcoal pneumonitis, ARDS and death; it must not be given to anyone with a depressed or unprotected airway, and it should not be given if the airway cannot be secured first.
- Do not give it for corrosive ingestions, where it obscures endoscopy and offers nothing, or for hydrocarbons, where aspiration risk is already high.
- Charcoal also adsorbs oral medicines and enteral nutrition indiscriminately, so it can render regular prescriptions ineffective, and repeat dosing with sorbitol-containing preparations has caused dehydration and electrolyte disturbance, particularly in children.
- The consumer trend of taking activated charcoal daily as a 'detox' or whitening product has no supporting evidence and carries a real risk of blunting the absorption of prescription drugs, including oral contraceptives.