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Definition of Activated charcoal
Medically reviewed by Min Clinic Staff | Updated: January 2026
Activated charcoal: Charcoal that has been heated to increase its ability to absorb molecules. Activated charcoal is used to help relieve intestinal gas. It is also used to filter and purify liquids, to absorb poisons (as in gas mask filters), and in emergency situations to neutralize swallowed poisons.