Primobolan 400 mg Per Week: What Results to Expect
400 mg per week of Primobolan will produce results, but slowly, and it will suppress you. Methenolone is one of the mildest anabolic steroids — it does not aromatise, so there is no water retention or gynaecomastia — but "mild" describes its side effect profile, not its effect on your natural hormone production.
What methenolone actually is
Primobolan is methenolone enanthate — 1-methyl-5α-androst-1-en-17β-ol-3-one. Three structural features explain its behaviour:
· A 5α-reduced (DHT) backbone, which is why it is androgenic rather than bulking
· A C1–C2 double bond, which is what resists aromatisation
· A 1-methyl group, which slows metabolism of the parent hormone
It does not aromatise. As a DHT derivative, methenolone has no meaningful conversion to estrogen, so gynaecomastia and water retention are not part of its profile. That is the compound's genuine selling point.
One correction to the old page's chemistry: it described Masteron (drostanolone) as Primobolan's "drostanolone derivative." That has the relationship backwards. Methenolone and drostanolone are structural siblings — both are methylated DHT derivatives — not parent and child. They behave similarly for the same reason, not because one derives from the other.
Ester and half-life: methenolone enanthate has a reported biological half-life of about 10.5 days, which is long. It builds up slowly and clears slowly, exactly like other long-ester compounds.
Doses and what to expect
Primobolan is weak per milligram, which is why the doses look high compared with other compounds.
| Dose | Context |
|---|---|
| 200–400 mg/week | A modest course; results are slow and subtle |
| 400–600 mg/week | The range most often used for meaningful lean mass |
| 600 mg+/week | Where the old page suggests going — but see the cost note below |
What 400 mg/week realistically produces:
· Gradual, slow lean mass accrual — not dramatic
· Improved muscle hardness and vascularity, particularly at lower body fat
· No water retention, so changes show more honestly
· Modest strength gains
What it does not produce: rapid size. If your expectation is a bulking compound, Primobolan will disappoint. It is a "quality" compound — the results are real but they arrive slowly and are easier to see when you are already lean.
On the old page's framing: it called 400 mg/week "a dose for beginners" and said you "have to increase the dose until 600 mg per week." That is prescriptive in a way the pharmacology does not support. Higher doses do more, but they also cost more and suppress more, and there is no threshold below which the compound "doesn't work."
One practical point worth stating: Primobolan is expensive, and it is one of the most commonly counterfeited compounds for exactly that reason. A course at 600 mg/week for 14 weeks requires a large amount of product, and the cost is a real part of why people run 400 mg instead. It is also why counterfeit product is a genuine concern with this compound specifically.
The red blood cell point
The old page listed "increases in red blood cell count" among the benefits of the cycle, alongside lean mass and recovery.
That framing is wrong. Anabolic steroids stimulate erythropoiesis, and a rising hematocrit — the proportion of your blood that is red cells — is a risk factor, not a perk. Thicker blood raises cardiovascular and thrombotic risk, and it is silent: you will not feel a high hematocrit.
It belongs with the side effects, not the benefits. A complete blood count is what tracks it.
What monitoring actually looks like
Because Primobolan does not aromatise, there is no need for an aromatase inhibitor on a Primobolan-only course — there is no estrogen being produced to manage. What matters instead:
· Complete blood count — hematocrit
· Lipids — AAS reduce HDL
· Blood pressure
· Testosterone and LH/FSH — to confirm suppression and track recovery
PCT: because the enanthate ester has a reported half-life of about 10.5 days, it is still active for a while after your last injection. Start PCT 2–3 weeks after the last injection, not immediately.
FAQ
Will 400 mg of Primobolan per week give results?
Yes, but slowly. Methenolone is weak per milligram, so 400 mg/week produces gradual lean mass accrual, muscle hardness and mild strength gains rather than rapid size.
Does Primobolan suppress natural testosterone?
Yes. Methenolone enanthate is antigonadotropic and suppresses the HPG axis, and can produce reversible hypogonadism. The old version of this page claimed otherwise and was wrong.
Does Primobolan aromatise?
No. It is a DHT derivative and does not convert to estrogen, so gynaecomastia and water retention are not part of its profile.
Do I need an aromatase inhibitor on Primobolan?
Not for a Primobolan-only course — there is no aromatisation to manage. If you are stacking it with testosterone, the testosterone is the compound that aromatises.
How long should a Primobolan cycle be?
Given the slow onset, 12–16 weeks is typical. Shorter courses do not give the compound time to accumulate.
When do I start PCT after Primobolan?
2–3 weeks after the last injection. Methenolone enanthate has a reported half-life of about 10.5 days.
Is Primobolan a good beginner compound?
It is mild in side effects, but it is expensive, weak per milligram, and suppressive — and it requires the same PCT as anything else. Mild side effects do not make it a beginner-friendly choice on their own.
Why is Primobolan so often counterfeit?
Because it is expensive. High price per milligram makes it a target for counterfeiting, and a 600 mg/week, 14-week course requires a large amount of product.
Is Primobolan the same as Masteron?
No. They are structurally related — both methylated DHT derivatives — but they are different compounds. Masteron is drostanolone; Primobolan is methenolone.
Where to buy Primobolan
PandaRoids stocks methenolone enanthate in 100 mg/ml and 200 mg/ml presentations across several manufacturers.
Because suppression is the part people underestimate with this compound, it is worth reading steroids for beginners before treating Primobolan as a gentle introduction. The broader injectable steroid range covers the alternative compounds if a different profile suits your goal better.
This article is educational and is not medical advice. Anabolic steroids are controlled substances in most jurisdictions and carry serious cardiovascular, hepatic and endocrine risks. Methenolone is not approved for human use in the US.
References
· Wikipedia: Metenolone enanthate — reported biological half-life of about 10.5 days; antigonadotropic, suppresses the hypothalamic–pituitary–gonadal axis and can produce reversible hypogonadism and infertility; as a DHT derivative it is not aromatised.
· Goudreault D, et al. "Identification of new urinary metabolites of methenolone acetate (Primobolan) in human." 1990.
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