superGrover
Member
RP has said/written it in several places. Thyroid, Vitamin A, and cholesterol must combine in the right quantities in the mitochondria to produce pregnenolone, which is the source of all other steroids, including cortisol and estrogen. If there is 0 Vitamin A then steroids can't be produced.
Cholesterol, longevity, intelligence, and health. -- "Thyroid hormone and vitamin A are used in the process of converting cholesterol into pregnenolone, the immediate precursor of progesterone and DHEA. Anything that interfered with these processes would be disastrous for the organism. The supply of cholesterol, thyroid and vitamin A must always be adequate for the production of steroid hormones and bile salts."
I can find sources on thyroid aiding the production of steroids, but not vitamin A. Peat himself didn't note a source either. :/