does vitamin b12 injections need to be refrigerated injection do vitamin b12 expire How Much Vitamin Sublingual B12 vs. B12 Injections:
Description
Vitamin B12 is absorbed through the digestive tract

includes warnings that parenteral thiamine may cause anaphylaxis and that the benzyl alcohol preservative is contraindicated in neonates due to risk of serious reactions)

Additionally, the NNMT substrate nicotinamide 12 is metabolized by the microbiome 56,57 , and thus NNMTi may modulate substrate availability, potentially influencing microbial metabolic capacity to drive the NNMTi-mediated weight loss
Its possible, if you have an iron deficiency together with a vitamin C deficiency