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Starting body composition: Leaner individuals see slower but cleaner results

While most men tolerate B12 well, those with Lebers disease (a rare genetic eye disorder) should avoid injections, as high doses of B12 may worsen symptoms

How to Get a Prescription for B12 Shots You do need a prescription, yes

A common pattern is a Myers Cocktail (which already has B12) once or twice a month, plus a quick standalone B12 shot in between if energy dips during a heavy stretch

A 2025 meta-analysis of 16 studies involving 6,098 participants found no statistically significant difference between intramuscular, oral, and sublingual B12 supplementation routes (p=0.270)

The abdomen provides consistent absorption, easy access for self-administration, and adequate fatty tissue in most individuals