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Excellent dietary sources include: Liver and organ meats : Beef liver provides approximately 70 mcg per 100gfar exceeding daily needs Shellfish : Clams, mussels, and crab are exceptionally rich sources Fish : Salmon (5 mcg per 100g), trout, tuna, and mackerel provide substantial amounts Meat and poultry : Beef, lamb, and chicken contain 13 mcg per 100g Dairy products : Milk (0.4 mcg per 100ml), cheese, and yoghurt contribute meaningfully Eggs : One large egg provides approximately 0.6 mcg For vegans and vegetarians , reliable B12 sources are essential as plant foods contain no bioavailable B12 (despite some claims about algae or fermented products)
View on PubMed Malinda KM, Sidhu GS, Mani H, et al
Intramuscular (IM) injection: A smaller dose of NAD+ is injected directly into muscle tissue
Others come in weekly for B12 when theyre feeling run down
If you take antacids, PPIs, or other acid blockers, you likely need B12 in a non-oral form