can you be allergic to b12 injections Adverse reactions vitamin due... : Allergy B12 Shots Side Effects And

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What Ferritin Levels Mean for Your Hair Optimal ferritin levels for healthy hair growth typically range between 40-70 ng/mL, though research suggests levels above 40 ng/mL are necessary to prevent hair loss [1]

Am J Public Health

At the cellular level, B12 acts as a cofactor for two critical enzymatic reactions: Methionine synthase converts homocysteine to methionine, essential for DNA methylation and synthesis Methylmalonyl-CoA mutase involved in fatty acid metabolism and myelin production By restoring adequate B12 levels, injections enable normal red blood cell maturation in the bone marrow, correcting the megaloblastic anaemia

More common allergic symptoms might include mild rash or itching at the injection site