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While B-12 is typically found in foods like meat, dairy, and eggs, some individuals may have difficulty absorbing it through their digestive system
Without enough B12, nerves can get damaged
See here for further information
In an open uncontrolled trial in 20 men with idiopathic infertility and a low testosterone-to-estrogen ratio, three months of treatment with letrozole resulted in improved sperm motility and morphology, reduced sperm DNA fragmentation, increased testosterone-to-estrogen ratio, and four spontaneous pregnancies
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