whats b12 injections for Sublingual B12 vs. B12 Injections:

No validated human dose has been established

WADA specifies in its S0 clause that any pharmacological substance without regulatory approval for human use is banned at all times in sport (World Anti-Doping Agency)

That being said, coverage for Vitamin B12 injections varies among insurance providers and may depend on medical necessity

Constipation affects a smaller percentage but can be persistent

Individuals with specific single nucleotide polymorphisms (SNPs) impacting B12 absorption may benefit more from certain forms of Vitamin B12. However, since these SNPs are not typically included in commercial tests, individuals may need to experiment with different B12 forms sequentially or opt for a supplement containing a combination of all three naturally occurring forms of B12 for potentially faster clinical improvements