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Description
Zinc may be essential for the morphology of sperm because it is required to make outer layer and tail of the sperm (reduces apoptosis)

347 A separate study found that adults aged 20-40 years given 20 mg PQQ daily for 12 weeks had a significant improvement in processing speed and executive speed after eight weeks compared with placebo

A.YamaguchiS.SukegawaK.OrT.et al (1997)
Efficacy of antioxidant therapy on sperm quality measurements after varicocelectomy: a systematic review and meta-analysis
