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These processes include assisting in DNA synthesis and repair, supporting protein synthesis, and activating essential enzymes

With guidance from a licensed provider, B12 injections are safe for regular use

3 A widely used non-radioactive alternative is the C breath test , in which a stable-isotope-labeled substrate (often octanoate or spirulina) is metabolized after it passes into the small intestine, so the rate of labeled CO appearance in the breath reports on emptying

For unapproved compounds like these peptides, the judicial picture is even less settled

Read our full coverage: FDA to Review 7 Peptides for Compounding List in July 2026