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Macrocytic anemia occurs when your body doesnt have enough normal red blood cells, and can cause symptoms including muscle weakness and paresthesias (paresthesias is the technical term for the pins and needles feeling on your skin)

It might not just be stress or a busy lifestyle

Cyanocobalamin (Vitamin B12) 5000 mcg, Benzyl Alcohol (preservative) 1.0% v/v, Sodium Chloride 0.22% w/v, Ammonium Sulfate 0.1% w/v, Citric Acid 0.01% w/v, Sodium Citrate 0.008% w/v

In its absence, peripheral neuropathy can occur, leading to numbness in your extremities

Advances in the understanding of cobalamin assimilation and metabolism