melanotic coli Melanosis coli: a disappearing act Melanosis coli - Wikipedia
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Caveat One cannot draw cause-effect relationships from these epidemiological studies

Zhenglai Hua, Xinyi Luo, Xiaoxia Xue, Xiangpeng Wang, and Mingshi Pang searched and collected literature

especially as he was scribbling down his foolproof plan to earn the latest hockey pads

doi: 10.1007/s10545-011-9406-5

d) no drugs co-ingestion
Exceeding that amount typically just increases the likelihood of side effects without providing any additional benefit
