Ray Peat on Growth Hormones

January 3, 2026

Critical Views on Long-Term Estrogen Therapy

"Constance Martin writes in her textbook of endocrine physiology (1976) that estrogens are not useful when administered over long periods.... M. R. Urist (in Biochemistry and Physiology of Bone, Vol. 2, edited by G. H. Bourne, 1972 edition) states that estrogen does not restore bone mass to an extent detectable by X-rays, that an excess of growth hormone can worsen the disorder, and that estrogen stimulates the release of growth hormone."

Nutrition for Women - Nutrition For Women

LH, Growth Hormone, and the Role of Prolactin in Stress and Estrogen

"LH (luteinizing hormone) increases when progesterone or testosterone are lacking, and growth hormone and prolactin (which are closely linked in evolution) both rise in a variety of stress situations as well as with estrogen stimulation."

May 1998 - May Ray Peat's Newsletter

Hormone Levels and Survival of Prostate Cancer Patients

"Prostate cancer patients with higher LH levels and lower testosterone died the fastest. (Harper et al., 1984.) Additionally, a high ratio of testosterone to estradiol or testosterone to prolactin was associated with better survival (Rannikko et al., 1981). Considering the factors separately, patients with higher testosterone levels had a better prognosis than those with lower levels, and patients with lower growth hormone levels fared better than those with higher growth hormone levels. (Wilson et al., 1985.)"

May 1998 - May Ray Peat's Newsletter

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