What is Oxymetholone 50 (Astera Labs)?
Oxymetholone is Anadrol, the fastest mass and strength compound there is, and the one with the strangest side effect profile.
Also sold as Anadrol, Adrol, A50 or oxymetholone.
Oxymetholone puts on weight faster than anything else available, largely through water and glycogen alongside real tissue. It is 17-alpha-alkylated, so injecting it changes nothing about the liver load. And it behaves oddly with estrogen in a way that catches people out.
Oxymetholone 50 benefits
- The fastest weight and strength gain of any compound here
- Noticeable inside the first week, which is why it opens cycles
- Strong effect on fullness and pump, useful when calories are high
- Injectable form avoids the stomach upset the tablets are known for
Oxymetholone 50 dosage
- Standard
- 50mg per day
- Higher end
- 100mg per day, experienced only
- Run alongside
- Testosterone as the base
- Frequency
- Daily, split at higher doses
- Cycle length
- 4 to 6 weeks maximum
50mg a day is where most people should stay. The jump to 100mg increases side effects considerably more than it increases results.
Four to six weeks is the ceiling and the liver sets it.
Package content
- Vial
- 10ml sterile multidose
- Strength
- 50mg/ml
- Oxymetholone per vial
- 500mg
- Brand
- Astera Labs
At 50mg a day one vial covers ten days.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Oxymetholone 50 for?
People opening a bulking cycle who want visible movement in the first fortnight, and who understand that a portion of it is water that will not stay.
It is the wrong compound for anyone cutting, anyone with blood pressure concerns, and anyone unwilling to have liver markers checked.
Before you run it. Injecting this does not protect your liver. The 17-alpha-alkyl group is what makes the compound survive digestion, and it is also what stresses the liver. That group is present whether you swallow it or inject it, so the hepatotoxicity is the same. The only thing injecting avoids is the digestive tract. Four to six weeks is the limit. The part that catches people out is estrogen:
oxymetholone does not aromatise, yet it still causes gyno and water retention, so an aromatase inhibitor does nothing about it. That side needs a SERM instead, which the
estrogen management guide explains. Blood pressure rises sharply on this compound and is worth monitoring at home.
Post-cycle therapy is required and
bloodwork should include liver markers. Not for anyone under 18, and not for women who are pregnant or breastfeeding.
How to use Oxymetholone 50
Intramuscular injection, daily. Split higher doses. Wipe the stopper before every draw and rotate sites. The injection technique guide covers it.
Frequently asked questions
Is an injectable version easier on the liver?
No, and this is the most common misconception about injectable orals. The liver load comes from the 17-alpha-alkyl modification built into the molecule, not from the route it takes to get into you.
That modification is there because the compound was designed to survive being swallowed. Injecting it bypasses the stomach, not the liver. Cycle length and liver monitoring should be exactly what they would be for the tablets.
Will an aromatase inhibitor stop gyno from Anadrol?
No, and this is the thing almost everyone gets wrong. Oxymetholone does not aromatise at all, so there is no estrogen for an aromatase inhibitor to act on, yet gyno and water retention still happen.
The mechanism is different, and a SERM is what addresses it. Running an AI and assuming you are covered is how people end up with gyno on this compound despite doing everything they thought was right.
How much of the weight stays?
Less than the scale suggests. A significant part of the early gain is water and glycogen, and that goes when the compound does.
What remains depends on whether the calories and training behind it were there. Anadrol accelerates a bulk, it does not replace one.
Why does it raise blood pressure so much?
The water retention is the main driver, and oxymetholone produces more of it than almost anything else. Combined with the effect on cholesterol, blood pressure often climbs quickly.
A home monitor is worth having on this compound specifically. It is the side effect most likely to end the cycle early and the easiest to actually measure.
How long should I run it?
Four to six weeks. The liver sets the ceiling.
Like Dianabol, it is a kickstart rather than a full cycle. Run it at the front, then drop it and let the injectables carry the rest.
