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None of that is the same as a promised jump in strength, speed, or endurance on demand, and any source implying otherwise is overselling

My understanding is that testing B12 during treatment is not normally needed

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In rodent studies its been linked to tissue repair, the growth of new blood vessels (angiogenesis), and gut healing

[16] [41] : 972 However, looking at the same scientific evidence, the European Food Safety Authority (EFSA) sets adequate intake (AI) at 4.5 g/d for pregnancy and 5.0 g/d for lactation

This process is fundamental to tissue repair, as an adequate blood supply is essential for the regeneration of damaged tissues