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Such experiments require careful control of preparation variables because small concentration drift can reshape response curves and complicate interpretation

If a peptide is not part of an approved drug product or does not have a verified bulk substance monograph, it may be illegal to compound for human use

Importantly, functional B12 deficiency can sometimes coexist with high total B12 levels, especially in kidney disease, and may require additional testing with methylmalonic acid (MMA) or holotranscobalamin if deficiency is suspected clinically

doi: 10.3390/molecules29040866