As mentioned earlier, in patients suffering from anemia (a condition in which your body is unable to produce adequate red blood cells), vitamin B12 injections can be used as a treatment
When deficiency develops, symptoms can include fatigue, weakness, numbness or tingling in the feet or hands, difficulty walking, mood changes such as depression, and problems with memory or concentration. Untreated, severe deficiency can lead to anemia and neurological damage, so medical attention and proper supplementation are essential. Why Choose B12 Injections
Cyanocobalamin (Vitamin B12) - 200g
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Natural animal-based foods , such as liver, sardines, and eggs that are rich in B12
This is a commonly referenced study from 1963 claiming a half-life of 5-6 days: nature.com/articles/198200a0 Although I would not cite it as an authority, the six-day half-life has also made it onto the B12 page in Wikipedia, seemingly unchallenged