giving a b12 injection in the arm can hcas give injections Kits vs. Professional B12 Injections: Weighing Pros and Cons Instructions for B12 Injection Intramuscular Injection: Definition and Patient

When you swallow it, digestive enzymes break it down before it can be absorbed

doi: 10.1016/S0928-4257(00)00147-9

Recent estimates have shown that 90% of people who follow a strict vegan or vegetarian diet are vitamin B12 deficient

The LD control group was particularly distinct from the other groups in the unweighted UniFrac and BrayCurtis dissimilarity analyses plots, suggesting that animals exposed to the same diet at an early age in life diet develop similar microbiome profiles that persist even after an acute change in diet

Reconstitution: 3.0 mL per 10 mg vial (~3.33 mg/mL) for accurate unit measurements

You can't just take a sample at any arbitrary time and expect it to reflect consistent exposure