why do vitamin b12 injections hurt What happens if you inject wrong? can b12 injection make you
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Seth T, Suri V, Balat D, Murthy S, Agarwal A, Pandurangan P, et al Rapid and safe correction of vitamin B12 deficiency using novel methylcobalamin nasal spray Int J Endocrinol Metab Disord

I hope you get some help from the dermatologist - please keep me posted and I'll do the same
The synergy stems from complementary mechanisms
PMID: 27456173
