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Charcoal will turn the stools black, and may lead to diarrhea or constipation in some people. No other adverse effects have been reported.
People with a rare disease called variegate porphyria who were given activated charcoal experienced a worsening of their condition.15 Until more research is available, people with variegate porphyria should not take activated charcoal.
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The information presented by Healthnotes is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2017.