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Vitamin B12 supplementation is generally considered safe across diverse medication regimens
Bacteriostatic water is the best general-purpose solvent because its 0.9% benzyl alcohol preservative protects multi-use vials for weeks
The temporal association does not necessarily indicate causation
The verdict: in most situation, vitamin B12 likely has no effect on hair loss (and hair regrowth), but vitamin B12 might reverse premature hair graying in the presence of B12 deficiency Although hypothetical evidence suggests an absence of B12 activity could negatively impact hair growth, in vivo human studies indicate that either (1) there is no relationship between vitamin B12 deficiency and hair loss and/or (2) there is an overriding factor (like methionine provision outside of the methylation cycle) that prevents B12 deficiency from causing hair loss
Your doctor may arrange investigations including a full blood count, serum folate levels, and in some cases, anti-intrinsic factor antibodies if pernicious anaemia hasn't been previously confirmed
