What is Nandrolone Decanoate 300 (Astera Labs)?
Astera Labs nandrolone decanoate at 300mg/ml, in a 10ml vial. Deca at the highest concentration we stock, so less oil for the same dose.
Also sold as Deca or Deca Durabolin.
Nandrolone is a 19-nor compound, which puts it in a different family from testosterone rather than being a variant of it. It builds mass more slowly than testosterone but holds it well, and it has a long reputation for making joints feel better under heavy loading. The decanoate ester is the long one, so levels build over weeks and clear over weeks.
Nandrolone Decanoate 300 benefits
- Steady mass gains that hold rather than dropping off after the cycle
- The joint comfort nandrolone is known for, which is why it turns up in heavy training blocks
- Mild on the liver, since nothing here passes through it the way an oral does
- One injection a week is enough, thanks to the long decanoate ester
- 300mg/ml, so a 600mg week is 2ml rather than 2.4ml at the standard 250
Nandrolone Decanoate 300 dosage
- Beginner
- 300 to 400mg per week, which is 1 to 1.3ml
- Intermediate
- 400 to 600mg per week
- Advanced
- 600 to 800mg per week
- Run alongside
- Testosterone at or above the nandrolone dose
- Frequency
- Once or twice weekly
- Half-life
- About 15 days
Nandrolone is not a compound you push. More does not produce proportionally more, and the progestagenic side effects climb faster than the mass does.
Cycles run long because the ester does: twelve to sixteen weeks minimum.
Package content
- Vial
- 10ml sterile multidose
- Strength
- 300mg/ml
- Nandrolone per vial
- 3000mg
- Carrier
- Miglyol 812
- Brand
- Astera Labs
At 400mg a week one vial covers seven weeks.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Nandrolone Decanoate 300 for?
Experienced users adding mass on a testosterone base, and anyone who trains heavy enough that joints are part of the calculation. It is not a first-cycle compound.
At 300mg/ml this is the most concentrated nandrolone we sell. DECAMED 250 is the same compound at 250mg/ml in sealed ampoules if you prefer that format.
Before you run it. Nandrolone suppresses your own testosterone hard, more than the dose suggests, so it is run alongside testosterone rather than on its own and
post-cycle therapy is not optional. It is also progestagenic, which means gyno can develop through prolactin rather than estrogen, and an aromatase inhibitor alone will not stop that. The
estrogen management guide covers the difference.
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 Nandrolone Decanoate 300
Intramuscular injection, once or twice weekly. Wipe the stopper with alcohol before every draw and use a fresh needle each time. Rotate sites. The injection technique guide covers the technique.
Frequently asked questions
Do I have to run testosterone with it?
Yes. Nandrolone suppresses your own production heavily while doing little for the things testosterone handles, libido and erectile function among them. Running it alone is the direct route to what people call deca dick.
The standard approach is testosterone at or above the nandrolone dose, so the ratio favours testosterone rather than the other way around.
Will it affect libido?
It can, and it is common enough to plan around. Nandrolone is progestagenic, and raised prolactin alongside suppressed testosterone is what produces the effect.
Keeping testosterone higher than the nandrolone dose is the first defence. If symptoms appear anyway, prolactin is the marker to check rather than assuming it is estrogen.
Will an aromatase inhibitor stop gyno from nandrolone?
Not on its own. Nandrolone aromatises only weakly, so most of the gyno risk here comes through progesterone and prolactin rather than estrogen. An aromatase inhibitor addresses the estrogen route and does nothing for the other one.
This is the part people get wrong, and it is why nandrolone gyno has a reputation for appearing despite an AI being run.
How long should a deca cycle be?
Twelve to sixteen weeks. The decanoate ester takes four to six weeks to reach working levels, so a short cycle spends most of its length still building.
One 10ml vial at 400mg a week covers seven of those weeks, so a full cycle is two vials.
Is 300mg/ml better than 250?
Not stronger, just more concentrated. A 600mg week is 2ml rather than 2.4ml.
Less oil per injection matters more on a compound you run for sixteen weeks than on something you take for four.
