Melanosis coli** Melanosis coli is a benign, reversible condition characterized by brown black pigmentation of the colonic mucosa, most often due to chronic use of anthraquinone laxatives. The discoloration is caused PT 141 vs Trimix: Comparing Two Powerful ED Treatments Melanosis coli PT 141 Nasal Spray: The Breakthrough Peptide for Intimacy, Energy, and Vitality Your Health Magazine Pathology Outlines Melanosis coli PT 141 Research Peptide Alpha Carbon Labs