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Solid-phase peptide synthesis of D-amino acid chains of this length requires specialized reagents (D-Fmoc amino acids are significantly more expensive than their L-counterparts), extended synthesis times, and careful quality control to ensure correct sequence and sufficient purity

If the cause isn't dietary then it is an absorption problem so you need to find another way of replenishing B12 initially

The FDA has cited concerns over the lack of large-scale, randomized, placebo-controlled human trials demonstrating its safety and efficacy

GHK-Cu is a bioregulator peptide that works at a cellular level to boost collagen and elastin production, resulting in smoother, firmer, more resilient skin