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That makes it theoretically safer metabolically compared to growth hormone

In lab and clinical research, its been observed to activate fibroblasts (the cells that produce collagen), increase glycosaminoglycan synthesis (which helps skin retain water), modulate matrix metalloproteinases (MMPs, the enzymes that break down old tissue), and act as a copper cofactor in antioxidant pathways

Vitamin B12 has a long history of effective subcutaneous delivery, with little to no muscle pain after B12 injections

Cellular energy

The injections are relatively painless, with most patients experiencing only a slight pinch at the injection site