Overview
Hair loss is fundamentally an energy problem. Hair growth requires huge amounts of energy and the follicle cells cannot use fatty acids efficiently the way they can use glucose, so the body treats hair as a luxury and shuts it down whenever metabolic rate falls. The mainstream story that DHT is the villain is essentially the same logic as the "cholesterol causes heart-disease story": a co-occurring marker mistaken for the cause. The scalp of balding people shows elevated cortisol, estrogen, prolactin and DHT. The rising DHT is best understood as an adaptive response to high local estrogen, not as the driver. Treating hair loss is treating chronic systemic stress. The same approach that protects against heart disease, dementia and cancer (high metabolism, adequate calcium and vitamin D, low PUFA, low estrogen, etc) is what protects the hair follicle.
Key Points
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Hair loss is a sign of insufficient energy production. Hair growth is treated by the body as non-essential, so it gets sacrificed early when metabolism declines. This is why women lose hair after menopause, men accelerate hair loss after andropause, and almost no man over 60 has full hair regardless of genetic predisposition. Even seasonal patterns matter: hair loss often improves in summer when metabolic rate is higher and worsens in winter when it drops.
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Prolactin is the actual molting hormone, and it terminates the growth cycle of the hair shaft. In chickens and other birds, prolactin is known as the molting hormone. In humans it is mainly the milk-producing hormone, but it regulates practically every cell in the body, and it has the same hair-shaft-terminating effect. Cortisol and prolactin both rise during stress, which is why baldness is statistically associated with heart disease and with the diagonal earlobe crease (both linked to high cortisol and prolactin). The healthy range for prolactin in men is around 4 to 7 on the standard scale, and 12 to 15 for women, despite labs having raised the upper "normal" limits to 20 and 30 respectively.
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Estrogen and prolactin are the hormones found in excess in balding scalps. In studies of the hormone content of the scalp itself, balding people have high levels of estrogen and prolactin, both of which are known to thin and destroy the follicle. Dogs go completely bald when their owners apply estrogen on their skin, and dogs who go bald spontaneously turn out to have very high estrogen levels. Menopausal women losing hair are not suffering from an estrogen deficiency, they are suffering from a progesterone deficiency with maintained or rising estrogen.
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Parathyroid hormone alone is enough to knock out the hair follicle. PTH interrupts the use of oxygen, so it acts as an antithyroid signal. A short shock of PTH does start regenerative processes (which is why people occasionally grow new hair around a scar, and why one old man who fell with his head in a fireplace and burned his scalp regrew a whole head of hair), but chronic PTH elevation destroys the follicle. The way to keep PTH low is to consume adequate calcium (up to 2,000 milligrams a day, mostly from dairy), vitamin D, vitamin A, and maintain a favourable calcium to phosphate ratio in the diet.
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The basic protocol for hair loss is to support thyroid and oxidative metabolism. That means avoiding polyunsaturated fats and all vegetable oils, eating liver and eggs for vitamin A, getting daily sunshine for vitamin D, and using thyroid supplementation if needed to bring resting body temperature up to around 98.6 Fahrenheit. Aspirin has antistress and pro-hair effects. The whole energy-providing system of the hair follicle centers on calcium, vitamin D, parathyroid hormone, and prolactin, so keeping PTH and prolactin low while keeping calcium and vitamin D adequate is the foundation.
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Topical caffeine, T3, progesterone, and DHEA all stimulate hair regeneration. Caffeine added to lotions and ointments stimulates hair growth and is cheap, neat (no smell or residue), and available as a pharmaceutical. Topical T3 applied to the skin stimulates regeneration and renewal. A mix of olive oil with about 50 milligrams of natural progesterone and 25 milligrams of DHEA per dose (lasting about a week) regenerates many skin functions including hair growth, though it leaves a sticky oily residue. Ray Peat applied DHEA in oil to the sides of his eyebrows, which had thinned with aging, and in six months he grew new dark normal hairs.
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Lidocaine topically may help by acting as a mast cell stabilizer. Some research has called for investigation of mast cell inhibitors for pattern baldness. Lidocaine works in that direction with antihistamine, antiserotonin, anti-inflammatory effects, and has produced almost immediate, dramatic improvements in eczema, burns, and other inflammatory skin conditions when applied early. Working at the level of available energy, lidocaine prevents energy waste and tends to make everything better.
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Finasteride is "an unfounded, insane decision" that disrupts the morphogenetic field. 5-alpha reductase produces both DHT and allopregnanolone, both essential to brain development, well-being, consciousness, and stress regulation. The same enzyme is involved in bile acid synthesis, in converting cortisol to its less potent reduced form, and in stabilizing the entire steroid system. Even snails given a 5-alpha reductase inhibitor fail to coil properly, and the effect persists for several generations, demonstrating how fundamental the enzyme is to morphogenesis. Whatever hair regrowth finasteride produces seems to come from artificially shocking the system into a kind of false puberty rather than from any specific anti-DHT mechanism.
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Stress, low metabolism, and a cold scalp form the systemic background. A balding area of scalp tends to be cooler and quieter than the rest of the head. Progesterone is closely connected to maintaining oxidative metabolism and higher resting body temperature. It stabilizes the brain so that it does not produce heat needlessly while also keeping the energy supply intact. Living at high altitude appears protective, with much lower rates of heart disease, dementia, cancer, and (in at least one case Georgi followed) reversal of classic androgenic alopecia in a man who moved to 14,000 feet in Kyrgyzstan and regrew a full head of hair.
Notable Quotes
"The belief in testosterone as the cause is similar to the old belief that males got prostate cancer because of having testosterone"
[Ray Peat — Hair Loss, Inflammation, and Osteoporosis]
"The parathyroid hormone, in itself, is enough to knock out the hair follicle."
[Ray Peat — Thyroid Function and Pulse Rate]
"It's such an unfounded, an insane decision (taking finasteride)... Any information that you get is going to make a thoughtful person fear it. And it's a very powerful intervention in your steroid chemistry, which especially affects your brain."
[Ray Peat — Finasteride as an Insane Decision]
"Hair loss is basically a sign that we're not producing sufficient amounts of energy. And since hair growth takes a significant amount of resources, when the body is not producing sufficient amount of energy, it says, okay, I'm going to get rid of or at least neglect things that I don't consider crucial. And guess what? Hair growth is one of those things."
[Georgi Dinkov — Bioenergetics & Supplements - Georgi Dinkov Part 2 - Hair Loss Remedy, Gut, Thyroid Health & more!]
Important Things To Consider
Synthetic progestins used in hair regrowth studies are not interchangeable with natural progesterone. Cyproterone acetate and other synthetic progestins were used at 600 to 800 milligrams daily in hair regrowth studies. Few people try natural progesterone in those kinds of doses, which is part of why reports of "I tried progesterone and my hair did not come back" are not necessarily evidence that progesterone does not work, only that the dose was much lower than the synthetic equivalent dose.
Progesterone alone is not enoughin; the underlying factors have to be addressed. Progesterone with vitam D, calcium, and thyroid is what optimizes hair growth, not progesterone alone. Without thyroid function, vitamin D adequacy, and calcium intake, the inflammatory factors blocking the follicle stay active. Progesterone cannot do the work by itself.
Aggressive scalp massage can cause inflammation and is counterproductive. The point of massage is gentle pleasure and increased blood flow, not redness and irritation. If you increase blood flow by causing damage, you produce lactic acid and block good energy production, the opposite of what the follicle needs. A soft, oil-based massage is the model, not the kind that leaves the scalp visibly inflamed.
Frontal fibrosing alopecia after menopause is an estrogen-driven collagen disorder. This is a relatively recent inflammatory pattern of baldness that progresses much faster than traditional gradual male pattern baldness. Estrogen is a major factor in shifting the balance of collagen production, and PTH, aldosterone, and general energy failure drive the fibrosis of the tissues. Keeping estrogen low and energy production up, with calcium, vitamin D, and progesterone, is the protective approach.
Topical caffeine has no fixed dose but is itchy at high concentrations. Caffeine is poorly soluble in water; aspirin can increase the amount that dissolves. The safe approach is to apply whatever concentration is comfortable. It can be mixed into a lotion or applied directly.
Premature gray hair can respond to copper. Shellfish (shrimp, clam, lobster, crab, squid) is the best food source of copper without excess iron, and shellfish are lower on the food chain so they carry less heavy metal contamination than fish. Iron should be limited (a coffee with iron-heavy meals reduces absorption) since iron interacts with PUFA and estrogen to drive lipofuscin and oxidative damage.
Finasteride and dutasteride should be avoided. The damage from these 5-alpha reductase inhibitors continues for years, sometimes decades, after stopping. Effects include destruction of the androgen receptor, raised prolactin, and binding to the estrogen receptor in some tissues. The drug interferes with allopregnanolone synthesis, which is why depression and muscle loss were documented in the clinical trials. There is also evidence of carcinogenicity and an association with castration-resistant aggressive prostate cancer.
Minoxidil benefits reverse after roughly six months of consistent use. Whatever shock-injury mechanism it uses to trigger regrowth wears off, and continued use at the same frequency starts producing hair loss. The pattern resembles menopausal women getting initial relief from estrogen and then deteriorating.