However, in plasma most proteins are reversibly post-translationally modified by cysteinylation 114 and, as mentioned above, s-cysteinylated albumin represents a major source of cysteine for cells, including cancer cells
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Lambert, A
Safety, Sourcing, and Why Medical Oversight Is Non-Negotiable BPC-157 has a strong safety record in animal studies notably, the lethal dose (LD1) has not been achieved across decades of preclinical research, and it has been used in human ulcerative colitis and multiple sclerosis trials without reported toxicity.6 But the absence of adverse events in animals does not translate directly to human safety, particularly at unregulated doses from unverified sources