Oral pregnenolone as hormone replacement therapy (HRT) in humans

As many of my readers know, the first step in steroid synthesis is the so-called “side-chain cleavage”, which converts cholesterol into pregnenolone (P5). That step is known as the rate-limiting step in the steroid cascade, and its function depends on the redox status and ATP levels. In other words, the rate-limiting step of steroid synthesis … Read more

Topical DHEA has potent anti-aging effects on human skin

I often get emails in regards to possible interventions with anti-aging effects on skin. The study I usually quote is an old one (circa 1967) that did extensive tests on 200+ people with age range of 57-88 years residing in a retirement home, and demonstrated that topical testosterone (1%) cream had the most potent anti-aging … Read more

Pregnenolone (P5) may be ergogenic and helps recovery from exercise

Take this study with a grain of salt simply because the only link to it is from a scientific conference, which means the study is not yet published in peer-reviewed journals. Yet, the results it reports are quite interesting. Namely, a single 100mg pregnenolone (P5) dose accelerated recovery from intensive physical exertion in the form … Read more

Pregnenolone may be a potent antibiotic, even for lethal infections

This is an old case study, reporting dramatic results from treatment with high doses pregnenolone (acetate ester) for an intractable bacterial infection that was rapidly spreading and proved resistant to all other therapies. The dose of pregnenolone (acetate) used was high – 100mg twice daily for a 6 year old child. That would correspond to … Read more

Pregnenolone (P5) – a new osteoporosis drug

About a month ago, I made a post in regards to aspirin becoming a new treatment for osteoporosis. Several months ago, I made another post about an in-vitro study demonstrating powerful anabolic effects of pregnenolone (P5) on bones. Apparently, the protective effects of P5 on bone health are known in certain circles and there have … Read more

Pregnenolone safe and effective in big human trial for back pain

About 2 years ago I posted about a study that suggested pregnenolone may relieve low-back pain in humans. At the time, a bigger human clinical trial was planned and the results of that trial were just released. Pregnenolone, slowly titrated to reach doses of 500mg/day, was found to be safe and effective for low-back pain … Read more

Male fertility depends on intensity of (sperm) metabolism

Yet another aspect of health that turns out to be directly controlled by quality/speed of metabolism. I made a few posts in the past demonstrating that progesterone and pregnenolone activate a calcium channel (CatSper) specific to progesterone, which greatly increases sperm motility. https://www.nature.com/articles/nature09767 https://www.sciencedaily.com/releases/2016/03/160317150803.htmhttps://www.sciencedaily.com/releases/2016/03/160317150803.htm However, I suspected that this is not the whole story behind … Read more

Pregnenolone (P5) fully prevents testicular atrophy due to steroid (ab)use or high estrogen

I often get emails from bodybuilders, athletes and others who have used or currently use steroids and want to either protect themselves while using those steroids or want to recover after long-term usage. It is well-known that most performance enhancing steroids, including plain testosterone (T) or DHT, suppress gonadal function through a negative feedback mechanism … Read more

Allopregnanolone as a treatment of Alzheimer Disease (AD)

It looks like the recent FDA approval of allopregnanolone (ALLO) for postpartum depression may open the floodgates to ton of new research with this steroid, as well as with its reliable precursors such as pregnenolone and progesterone. I posted several studies in the past demonstrating that pregnenolone, progesterone and ALLO are all endotoxin antagonists and … Read more

Progesterone may bind and deactivate endotoxin (LPS) directly

I made a few posts recently discussing the blocking effects of pregnenolone on TLR4 and TLR family receptors in general, and the reduction of systemic inflammation stemming from this blockade/regulation. http://haidut.me/?p=17 It is well-known that glucocorticoids and mineralocorticoids are protective against endotoxemic shock, possibly due to blocking the hypotensive and inflammatory effects of endotoxin. However, … Read more