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folic acid only, zinc only, a combination, and placebo.[30] After 26 weeks of treatment, a statistically significant increase in sperm concentration was noted among subfertile men receiving combination therapy

Brewer, Redox-Dependent Regulation of Sulfur Metabolism in Biomolecules: Implications for Cardiovascular Health

The delay wasn't scientific

doi: 10.1210/jc.2017-01210 52 HjelholtAJCharidemouEGriffinJLPedersenSBGudiksenAPilegaardHet al

This places physician sentiment at a critical moment in U.S
