Sublingual tablets and nasal sprays bypass some of the digestive steps, which may be helpful if you have absorption challenges or prefer not to swallow pills. Vitamin B12 injections deliver the vitamin directly into your bloodstream, bypassing the digestive tract and providing faster, more reliable absorption
[106] Other drugs [edit] Certain medications can decrease the absorption of orally consumed vitamin B 12 , including colchicine, extended-release potassium products, and antibiotics such as gentamicin, neomycin and tobramycin
Vitamin B12 Deficiency Your body stores 1,000-2,000 times as much vitamin B12 as you'd eat in a day, so it can take many years to see symptoms of vitamin B12 deficiency
Stopping cold often leads to gradual rebound, which is consistent with how all incretin therapies behave
Safety Profile and Regulatory Considerations for Research Use