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There was a high variability among the obtained results from the Se-only supplementation, but most studies (five of seven studies) have found positive effects, particularly on sperm motility (174, 186, 187, 216218), and in some, also sperm concentration and/or morphology (174, 186, 216, 217)
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Research indicates that endogenous growth hormone secretion declines substantially with aging, with levels at age 70 approximately 60% lower than at age 20
Glucagon-like peptide-1 (GLP-1) is an incretin secreted by L-cells in the small intestine in response to food intake [4]
Liao et al., 2010) (Table 1)
