why give vitamin b12 injections shot Vitamin B12 Injections Cost Near

Cyanocobalamin (intramuscular route)

The chronic use of any of these medications has the potential to cause complications related to vitamin B12 deficiency, which includes impaired DNA synthesis, impaired cell division, hematopoiesis, hyperhomocysteinemia, and metabolism of odd-chain fatty acids that is necessary in preventing demyelination of nerves

Only testing can tell you the answer, but a daily B12 injection schedule should be your starting point

Consider complementary NAD+ precursors (NMN/NR) per emerging stack protocols [11]

Beyond Use Date 90 Days from compounding (USP ) Use within this window from the date your vial is compounded