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Importantly, functional B12 deficiency can sometimes coexist with high total B12 levels, especially in kidney disease, and may require additional testing with methylmalonic acid (MMA) or holotranscobalamin if deficiency is suspected clinically

While you may feel a brief pinch, the process is generally well-tolerated, and any discomfort is minimal

Benfotiamine B1 Not B12 but often combined to relieve nerve pain

The body needs time to respond to Vitamin B12 according to age-related factors and health status, and potential absorption difficulties that may slow down its effects