why does b12 injection hurt so much Vitamin Injections: What You Need To Know Feeling Tired All the Time?

Injections can cause minor effects such as irritation or itching at the injection site, and the consumer fact sheet is a good plain-language reference on what B12 does and does not do

Individuals over 50, you likely need supplemental B12

Do not get B-12 injections without your physician's approval.

Rohr, M

Research indicates a strong association between low vitamin D levels and alopecia areata, with studies showing significantly lower serum vitamin D concentrations in affected patients

[4] Pharmacokinetics and Distribution Pharmacokinetic work in mice reported systemic exposure and distribution of 5-Amino-1MQ to metabolically active tissues, including adipose, muscle, and liver, after subcutaneous compound application