Hiya! I'm injecting hydroxy B12. If I understand this right, it is better for injecting as you get more of a steady level, provided you don't have a genetic impairment to activating this to methyl B12. Since I was perfectly healthy as a kid, it is safe to assume I don't have genetic methylation impairments. He has put my son on methyl B12 (he got ill when he was less then a year old.) BTW it's still going really well, no headaches and generally feeling drastically better.