What is Testosterone Propionate 100 (Astera Labs)?
Astera Labs testosterone propionate at 100mg/ml, in a 10ml multidose vial. The fast testosterone ester, in the format that means one item rather than ten ampoules.
Also sold as Test-P, propionyltestosterone, testosterone propanoate or Testoviron.
The propionate ester is the smallest in common use, which makes it quick in and quick out. That buys results early in a cycle and a fast exit if something needs stopping. It costs injection frequency, because the same speed means levels fall within a couple of days.
Testosterone Propionate 100 benefits
- Works within days rather than the three to four weeks a long ester needs
- Clears fast, so post-cycle therapy starts sooner and problems can be stopped quickly
- Less water retention than the long esters at the same weekly total
- One vial covers the whole run instead of ten ampoules to open and dispose of
- Draw any volume, so a 50mg dose is half a millilitre rather than half an ampoule wasted
Testosterone Propionate 100 dosage
- Standard
- 50 to 100mg every other day, which is 0.5 to 1ml
- Weekly equivalent
- Roughly 175 to 350mg
- Higher end
- 100mg daily, experienced users only
- Frequency
- Every other day, daily at higher doses
- Half-life
- About 2 days
At 100mg/ml the arithmetic is direct: 1ml is 100mg. The vial's advantage over ampoules shows at the lower end, where 50mg is simply half a millilitre drawn rather than half an ampoule thrown away.
Every other day is the minimum frequency, not a suggestion. Stretch it to twice a week and levels crash between shots, which is worse than running a long ester properly.
Package content
- Vial
- 10ml sterile multidose
- Strength
- 100mg/ml
- Testosterone per vial
- 1000mg
- Carrier
- Miglyol 812
- Brand
- Astera Labs
At 100mg every other day one vial covers 20 days.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Testosterone Propionate 100 for?
Two uses. As the opener on a long cycle, covering the first four weeks while enanthate or cypionate build. And as the testosterone base of a short cutting cycle, where low water retention and fast clearance both matter.
This is the one product where our two brands are genuinely identical on paper: TESTOMED P 100 is the same 100mg/ml, the same 1000mg, at the same 29.00. Choose on format alone. Ampoules suit this compound slightly better, since every-other-day dosing means around fifteen entries into a vial stopper against ten sealed single doses. The vial wins if you dose at 50mg, where an ampoule would be half wasted.
Before you run it. This replaces your own testosterone production for the cycle and for some time after, so
post-cycle therapy is part of the plan, not an optional extra. Testosterone aromatises, which is what the
estrogen management guide covers, and
bloodwork is how you know where you stand. Not for anyone under 18, and not for women who are pregnant or breastfeeding.
How to use Testosterone Propionate 100
Intramuscular injection, every other day. Wipe the stopper with alcohol before every draw and use a fresh needle each time, which matters more here than on a weekly compound because of how often you are entering the vial. Rotate sites on a fixed pattern. The injection technique guide covers it.
Frequently asked questions
Vial or ampoules for propionate?
Ampoules have the edge on this compound specifically. Every-other-day dosing means around fifteen draws from one 10ml vial, so fifteen entries through the same rubber stopper, against ten sealed single doses that are sterile until opened.
The vial wins if you dose at 50mg, where half an ampoule would be discarded each time. At 100mg doses the ampoule is exactly one dose and nothing is wasted either way.
Why does propionate sting?
The short ester means a higher concentration of compound relative to oil, and faster dispersal into the tissue. That combination irritates more than a long ester does. It is characteristic of propionate, not a fault.
Injecting slowly, using a larger muscle, and letting the vial reach room temperature first all reduce it. Soreness that worsens over days, or comes with heat and redness, is a different matter and needs checking.
How often do I have to inject it?
Every other day. The half-life is around two days, so anything less frequent means levels drop between injections rather than holding.
Some run it daily at the higher end of the range. Nobody successfully runs propionate twice a week.
Propionate or enanthate for a first cycle?
Enanthate, almost always. One injection a week is far easier to sustain than fifteen a month.
Propionate's advantages, fast onset and fast exit, matter most to people who already know how they respond.
Do I need PCT after testosterone propionate?
Yes. It suppresses your own production the same as any exogenous testosterone.
The one advantage is timing: because it clears in a few days rather than a couple of weeks, post-cycle therapy can start much sooner after the final injection.
