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Because B12 injections deliver B12 straight into your muscle and bloodstream, they skip the slow digestive route that oral pills rely on, so you notice the difference far sooner than you'd expect
Subcutaneous administration achieves 7085% bioavailability compared to 4050% for oral routes due to hepatic first-pass metabolism
[Crossref] Wang H, Li L, Qin LL, Song Y, Vidal-Alaball J, et al
Add a B12 supplement to your routine if youre vegan or over 50, since absorption drops with age and plant-only diets miss the mark
If you dont get enough vitamin B12 or you have low B12 absorption, your body will start to respond