evidence: Activated charcoal isn’t commonly used to treat stomach problems caused by viruses, bacteria, or other germs. While there’s ongoing research in this area, there's not enough evidence to support it's effectiveness. [...] Health experts do not recommend giving activated charcoal multiple times to treat poisonings in people who’ve taken drugs that can slow gut motility (like opioids or anticholinergics). If you have taken one of these drugs and need more than one dose of activated charcoal, your doctor should closely monitor you for any problems. [...] There’s not enough research to support the use of activated charcoal supplements for health reasons outside of emergency poisonings. But some companies claim their products can treat gas, bloating, diarrhea, hangovers, or skin conditions.