Deltoid (upper arm) if someone else administers
If you are specifically targeting thinning hair, receding hairlines, or general follicle health, the peptide research record supports AHK-Cu as a purpose-built option
The serum test measures all B12 present in the blood, as well as all substances that are chemically similar to vitamin B12
Switching is possible but not straightforward
Zitvogel, has held research contracts with Glaxo Smyth Kline, Incyte, Lytix, Kaleido, Innovate Pharma, Daiichi Sankyo, Pilege, Merus, Transgene, 9 m, Tusk and Roche, was on the on the Board of Directors of Transgene, is a cofounder of everImmune, and holds patents covering the treatment of cancer and the therapeutic manipulation of the microbiota