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. 2020 Jan 31;11:11. doi: 10.3389/fendo.2020.00011

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Copyright © 2020 Hackney.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

Testosterone production is controlled by the hypothalamic -pituitary-gonadal (HPG) regulatory axis which involves the hormones gonadotrophin-releasing hormone (GnRH), luteinizing hormones (LH), and follicle-stimulating hormones (FSH). Reprinted with permission: Artoria2e5 [CC BY 3.0 (https://creativecommons.org/licenses/by/3.0)].