What is Mesterolone 50 (Astera Labs)?
Astera Labs mesterolone in 50mg tablets, 50 to a sachet. Proviron at the strength for people running it at the top of the range.
Also sold as Proviron, Provironum or mesterolone.
Mesterolone is a DHT derivative that cannot aromatise and, unusually for an oral, is not 17-alpha-alkylated. It binds strongly to SHBG, the protein that holds testosterone in an inactive state, which frees up more of whatever testosterone is already in your system. That, rather than any anabolic effect of its own, is what it actually does.
Mesterolone 50 benefits
- Frees up testosterone already in your system by binding SHBG
- Not 17-alpha-alkylated, so the liver is not what limits it
- Cannot aromatise, and mildly reduces conversion from other compounds
- Commonly used for libido and a harder look rather than for size
- Can be run for longer than an alkylated oral, because the usual ceiling does not apply
- 50mg tablets suit the higher 50 to 100mg range
Mesterolone 50 dosage
- Standard
- 50mg per day, which is one tablet
- Higher end
- 100mg per day, two tablets
- Frequency
- Once or twice daily
- Half-life
- About 12 hours
- Cycle length
- Can run the length of the cycle, the liver is not the limit
At 50mg per tablet, one tablet is a full standard dose. If you want to sit at 25mg, the 25mg tablets are the better buy rather than halving these.
Running it alone achieves very little. Mesterolone frees up testosterone that is already there. At 100mg a day it also becomes noticeably suppressive, which is worth knowing before you sit at the top of the range.
Package content
- Tablets
- 50 per sachet
- Strength
- 50mg mesterolone per tablet
- Mesterolone per sachet
- 2500mg
- Half-life
- About 12 hours
- Brand
- Astera Labs
At 50mg a day one sachet covers 50 days.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Mesterolone 50 for?
People running mesterolone at 50 to 100mg a day alongside a cycle, where a tablet is a whole dose.
PROVIMED 25 is the same compound at 25mg, which is where most people actually sit and the better choice if you have not run it before.
How to use Mesterolone 50
Swallow with water, once or twice daily. It can be taken alongside food. No cycling limit is imposed by the liver.



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