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*Nutrients*, 5(11), 4284-4304

R 2 is an amino acid (D or L), such as, for example, tyrosine, cysteine, phenyalanine, aspartic acid, glutamic acid, glycine, tryptophan, lysine, homocysteine, homoserine, homophenylalanine

17 = 5,65

doi:10.1007/s00441-019-03016-8 Chang CH, Tsai WC, Lin MS, Hsu YH, Pang JH

Elevated LH directly signals the Leydig cells in the testes to increase testosterone production (3)

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