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More effective if you have to stump up your hard earned cash
Thats because your body doesnt absorb all of it
Do vitamin B12 injections work immediately
PMID 10730193
Available options include: B12 Shots : Intramuscular injections (IM) are the most commonly used treatment because they bypass absorption barriers and deliver the vitamin directly into the bloodstream[21]
Intended Use: Strictly for in-vitro laboratory research
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