what amount should b12 injection be Cyanocobalamin (B12) 1000 mcg/mL, Multiple Dose Vial 30 mL How Often Can You Get

Your body also needs B12 for the development of your central nervous system (your brain and spinal cord)

In their review, Doets et al

They are not

Research Findings 5-Amino-1MQ is a selective Nicotinamide N-Methyltransferase (NNMT) inhibitor that has emerged as a significant research tool for investigating metabolic regulation and cellular energy homeostasis

(2001) Oral cobalamin therapy for the treatment of patients with food-cobalamin malabsorption

The compounds have been found in dietary supplements and products marked as "research only", creating exposure risk for athletes who may purchase such products for cognitive benefits without understanding they're consuming prohibited substances with no established safety profile