b12 injection stomach pain Best Vitamin Sites: Where to Inject B12 · PA Relief Vitamin B12 Side Effects
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Huemer M, Burer C, Jesina P, Kozich V, Landolt MA, Suormala T, et al
Aggressive mixing can denature peptide chains and reduce potency
The exact amount depends on the patients health, how bad the deficiency is, and the doctors advice

Arsenault JE 1 , Mora-Plazas M, Forero Y, Lpez-Arana S, Marn C, Baylin A, Villamor E

1 2 BMJ

The injectable form is reserved for people whose intestines or kidneys cannot absorb, synthesize, or conserve enough carnitine