iron dextran and vitamin b12 injection INFeD (Iron Dextran): Uses, Side
Description
not approved for human or veterinary application.
Ordering multiple large items

Notably, this is a common anti-counterfeiting procedure for manufacturers who illegally produce medicinal products

Low levels slow the energy boost process

Note the confluence of drugs working on the growth hormone axis in this Table and the one above

What it does, if you are deficient, is fix the energy and metabolic drag that low B12 causes
