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Do not ignore persistent black stool, especially if it does not resolve within a day or two after stopping suspected dietary causes

[DOI] [PubMed] Ortz, C., Botti, H., Buschiazzo, A
G.KansanenE.ZhangJ.Darley-UsmarV

But what exactly is this tetrapeptide, and what does the research actually show, and how is it typically used
