A recent analysis showed that in France, the concentration of sperm in men decreased by almost one third between 1989 and 2005. Most, but not all, studies by various European countries with large databases and the possibility
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Effect of estrogen receptor-subtype-specific ligands on fertility in adult male rats in: Journal of Endocrinology Volume 225 Issue 3 (2015)
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Fears over falling human sperm count may be overblown — Harvard Gazette
Male fertility: How everyday chemicals are destroying sperm counts in humans and animals - ABC News
(PDF) Metformin Improves Fertility in Obese Males by Alleviating Oxidative Stress-Induced Blood-Testis Barrier Damage
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Sperm Count and Omega-3: Is This the Cure for Male Infertility?