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Intramuscular shots put B12 right into the muscle

Nunes J, Andrieux P, Brochet P, Almeida RR, Kitano E, Honda AK, Iwai LK, Andrade-Silva D, Goudenge D, Alcntara Silva KD, Vieira RS, Levy D, Bydlowski SP, Gallardo F, Torres M, Bocchi EA, Mano M, Santos R, Bacal F, Pomerantzeff P, Laurindo F, Teixeira PC, Nakaya HI, Kalil J, Procaccio V, Chevillard C, Cunha-Neto E

Its amazing how one protein impacted fracture healing, says Daniell, corresponding author on the paper

Decreased osteogenesis of adult mesenchymal stem cells by reactive oxygen species under cyclic stretch: a possible mechanism of age related osteoporosis

The most common side effect is temporary mild irritation at the injection site