what size needle to inject b12 should be used for injections B12 Shots: Benefits, Uses, Safety, Cost & How They Work size needle for b12 injection

Preferred sites are the periumbilical abdomen (at least 2 cm from the navel), lateral thighs, and the dorsal upper arm

High doses of Vitamin C taken within 1 hour of the shot may lower B12 in blood (minor, stagger doses)

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[1] The cyclic disulfide structure is thought to contribute to conformational rigidity and resistance to peptide degradation in biological environments. Pharmacokinetic studies in murine plasma indicated a plasma half-life of approximately 4 minutes under in vitro conditions, reflecting rapid enzymatic metabolism of the peptide backbone

What changes across the cycle is how your body responds, not how often you inject