This 1997 study investigated the effects of allopregnanolone, a neuroactive steroid derived from progesterone, on sleep patterns in rats. The findings revealed that allopregnanolone enhances high-frequency EEG activity (≥17 Hz) during REM sleep, particularly within the first hour post-injection, mirroring the effects of benzodiazepines. The study suggests that allopregnanolone modulates
This 2014 review explores the role of allopregnanolone, a neuroactive steroid derived from progesterone, in the pathophysiology of depression and anxiety. Allopregnanolone acts as a potent positive allosteric modulator of GABA_A receptors, enhancing inhibitory neurotransmission. Reduced levels of allopregnanolone have been associated with major depression, anxiety disorders, premenstrual dysphoric disorder,
This 1997 double-blind, placebo-controlled crossover study investigated the effects of oral progesterone on sleep architecture in nine healthy male volunteers. Administration of 300 mg micronized progesterone at 9:30 PM significantly increased non-REM sleep, particularly stage 2, and decreased slow-wave activity (0.4–4.3 Hz) in EEG recordings. There was also a trend
This observational study investigated the effects of low-dose finasteride (1 mg/day for 4 months) on circulating neuroactive steroids in 12 men with premature androgenetic alopecia. The treatment led to a gradual decrease in several 5α-reduced and 5-ene steroids, including DHT, allopregnanolone, pregnenolone, and others. These changes, particularly the reduction in
This study, published in Gynecological Endocrinology in 2003 (PMID: 12724021), examined the effects of various hormone replacement therapy (HRT) regimens on neurosteroid levels in 186 postmenopausal women over 12 months. Results showed that all HRT preparations significantly increased allopregnanolone levels, a neurosteroid with sedative and anxiolytic properties, suggesting a potential
