Pregnenolone

Pregnenolone is the master steroid hormone, the first substance synthesized from cholesterol within the mitochondria, from which all other steroid hormones are derived. 9 Peat argued that its production is fundamentally dependent on the delivery of thyroid hormone, vitamin A, and cholesterol to the mitochondria in the right proportion. 4 When this system is compromised by factors like lipid peroxidation from unsaturated fats, energy deficiency, or hypothyroidism, pregnenolone synthesis fails, leading to a compensatory over-production of cortisol. 4 Peat explicitly rejected the "pregnenolone steal" theory as a mechanical oversimplification, insisting that a well-nourished body naturally produces enough pregnenolone and progesterone to inhibit the stress systems, and that deficiencies arise from a lack of supportive factors like thyroid hormone, not a simple substrate diversion. 1

The physiological role of pregnenolone is to provide a buffer against stress and degeneration. Peat observed that in healthy, unstressed individuals, even massive doses produce no detectable hormonal changes, but in stressed or sick organisms, it normalizes elevated cortisol. 2 He described this as a saturation effect: once cortisol is brought down to normal, additional pregnenolone has no further hormonal action. 7 Its protective effects are wide-ranging, including improving memory and performance, protecting brain cells from excitotoxic damage, and restoring youthful properties to aged skin by improving circulation and contracting muscle-like cells. 2 Peat noted that pregnenolone stabilizes the cytochrome P-450 enzyme system against degradation, which he believed was a general mechanism explaining its anti-toxic and anti-hemolytic effects. 8 It also tends to normalize the function of the thyroid and other glands, which accounts for its broad benefits. 2

Clinically, Peat used pregnenolone as a primary intervention for conditions rooted in stress and hormonal deficiency. He reported dramatic, near-instantaneous effects, such as the recession of bulging eyes in Graves' disease within an hour, and the rapid improvement of joint mobility in arthritis and tissue elasticity in emphysema. 10 He considered the agitated depression involving elevated cortisol to be primarily a pregnenolone deficiency. 6 For supplementation, Peat found that a single oral dose of roughly 300 mg could remain active for about a week due to intestinal recycling and its ability to improve the body's own production. 2 He personally experimented with doses ranging from a pinch to several grams daily, noting the main side effect was a tightening of loose skin and a more youthful appearance. 5 He advised that sometimes an initial dose of a few hundred milligrams is needed to lower cortisol, and that it converts to either DHEA or progesterone based on the body's needs, offering an advantage over supplementing those hormones directly. 3

Peat and Dinkov discussed why pregnenolone was never adopted by the pharmaceutical industry. Peat explained that like progesterone, pregnenolone is a non-patentable substance that supports the body's endogenous production rather than suppressing it, making it a "terrible drug" from a commercial standpoint because it tends to cure diseases rather than create dependency. 11 He noted that a 1950 symposium had already revealed its curative effects, but the drug industry had no interest in its very generality, which made it seem unlike a drug. 2 Dinkov questioned why it was never developed as a universal hormone replacement therapy, given its role as the precursor to all steroids. 11 Peat affirmed that if made available massively and cheaply, pregnenolone, along with progesterone and DHEA, could essentially cure most of the current degenerative and stress-related diseases. 11