Diurnal rhythm
of testosterone secretion before and throughout puberty in healthy girls: Correlation with 17β - estradiol and dehydroepiandrosterone sulfate
Studies have shown that greater vitamin A concentrations in the testes increase
basal testosterone secretion and a variety of growth factors including IGF - binding protein 4 (which transports IGF), androgen - binding protein (which transports androgens), transforming growth factor - beta (which causes cell growth but suppresses cancer) and steroidogenic acute regulatory protein (which is responsible for the transport of cholesterol into the mitochondria for its conversion to steroids).
Changes in diurnal rhythm and levels of total and
free testosterone secretion from pre to late puberty in boys: Testis size of 3 mL is a transition stage to puberty
Unfavorable effects
of testosterone secretion, due to changes of the circadian timing system, were suggested as one explanation.
The goal of HCG is a short - term increase of
testosterone secretion to improve fertility.
This decrease in Leptin causes an immediate stimulation of
testosterone secretion.