why do i feel tired after my b12 injection Worse I Feel Tired All the

Since multiple species of Propionibacterium produce no exotoxins or endotoxins and have been granted GRAS status (generally regarded as safe) by the United States Food and Drug Administration, they are the preferred bacterial fermentation organisms for vitamin B 12 production

In vitro studies have characterised its binding interactions with nitric oxide-related signalling systems and its effects on extracellular matrix protein expression in cell culture models

However, injections have an important edge over oral supplements that you may not be aware of

And freezing, while it preserves the unreconstituted powder, destroys the reconstituted solution by forming ice crystals that shear peptide molecules apart