ResearchSafe

Progesterone (Micronized Progesterone (Prometrium))

Category: Hormone Replacement. Status: FDA Approved.

A bioidentical hormone with neuroprotective, sleep-promoting, and anti-estrogenic properties. Used in both male and female HRT protocols for mood stabilization, deep sleep enhancement, and estrogen balancing.

How it works

Agonizes progesterone receptors and GABA-A receptors (via allopregnanolone metabolite). Inhibits 5-alpha reductase, opposes estrogen proliferative effects, and promotes myelination in neural tissue.

Key facts

  • Molecular weight: 314.46 Da
  • Half-life: ~16-18 hours (oral micronized)
  • Bioavailability: ~10% oral (first-pass); ~100% topical/vaginal
  • Storage: Room temperature. Protect from light and moisture.

Dosing overview

  • Typical dose: 100-200 mg oral or 20-40 mg topical
  • Frequency: Nightly (oral) or daily (topical)
  • Duration: Ongoing
  • Route: Oral capsule, topical cream, or vaginal

Reported benefits

  • Enhanced deep sleep (GABA modulation)
  • Neuroprotection
  • Estrogen opposition
  • Reduced anxiety
  • DHT reduction (5AR inhibition)
  • Cardiovascular protection

Possible side effects

  • Drowsiness
  • Mild dizziness
  • Breast tenderness
  • Mood changes (rare)
  • Bloating

Research

  • Progesterone and neuroprotection after TBI (2020): Progesterone reduced neuronal cell death by 40% and improved cognitive outcomes in traumatic brain injury models.
  • Oral progesterone and sleep architecture (2019): Micronized progesterone increased slow-wave sleep by 25% without next-day sedation, via allopregnanolone GABA modulation.

Community reviews of Progesterone

Rated 4.7 out of 5 from 10 community reviews by ResearchSafe members.

  • longevity_anna rated it 5/5 - Worth adding to the protocol: Progesterone has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you want.
  • morning_protocol rated it 5/5 - Solid compound with real results: Been using Progesterone for about 1 month and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
  • injection_journal rated it 4/5 - Noticed clear benefits within weeks: Added Progesterone to my protocol about 6 weeks ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
  • dose_math_derek rated it 5/5 - Consistent improvement over 2 months: Added Progesterone to my protocol about 2 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
  • fasted_frank rated it 5/5 - Genuinely effective after 6 months: Been using Progesterone for about 6 months and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
  • experiment705 rated it 5/5 - Finally slept through the night: For me the big thing was sleep. I started micronised progesterone because my nights were getting choppy and I was dragging through training and work in Sweden. After about 4 months, I was falling asleep easier and waking less. It felt calm and very steady, just my own experience.

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Community discussions about Progesterone

Research and educational reference only. Not medical advice.