Boldenone Undecylenate (Equipoise)
EQ · Equipoise · Boldenone
Equipoise; long half-life, slow steady gains. Notorious for long detection times.
Key takeaways
- Veterinary long-acting testosterone analog (Equipoise); no current approved human use.
- ~14-day half-life, peak around day 6; steady state takes weeks and clearance is slow.
- Aromatizes weakly and isn't hepatotoxic; hematocrit and long detection windows are the practical concerns.
- Human data is thin; most PK understanding is extrapolated from veterinary and analog studies.
Overview
What it is
Boldenone undecylenate (Equipoise, EQ) is a long-acting injectable androgen developed for veterinary use; the human version (Parenabol) was withdrawn decades ago. It's a testosterone analog with a 1,4 double bond that reduces androgenic and estrogenic activity, and it drives erythropoiesis strongly, which feeds its reputation for endurance and slow, lean gains.
Pharmacokinetics
The undecylenate ester gives a ~14-day half-life with a peak around 6 days post-injection and ~63% bioavailability. Levels build slowly, so steady state takes many weeks; community protocols inject once or twice weekly.
Harm reduction
Not hepatotoxic, and aromatization is weak relative to testosterone, but hematocrit can climb and detection windows run long. HPTA suppression is real, and the long ester means slow clearance after the last shot.
Reported dosing protocols
Protocols reported in research literature and clinic/community use — informational context, not a dosing recommendation.
| Use case | Dose | Route | Frequency | Duration |
|---|---|---|---|---|
| Performance (community) | 200–600 mg weekly | IM | 1–2× weekly | 10–14 weeks |
Pharmacokinetic summary
- Model tier
- Advanced (t½ + Cmax + Tmax + F)
- Half-life
- 14 days
- Cmax
- 600 ng/dL
- Tmax
- 6.0 days
- Bioavailability
- 63%
- Typical dose
- 200–600 mg
Harm reduction
- Aromatizes
- Yes
- DHT derivative
- No
- Injection frequency
- 2×/week
Frequently asked questions
Is Equipoise approved for humans?
No. Boldenone undecylenate is a veterinary product approved for horses. A human formulation (Parenabol) existed briefly in the 1970s and was withdrawn. Anything available today is veterinary or underground-lab product.
Why do EQ cycles run so long?
The undecylenate ester's ~14-day half-life means blood levels take 4–6 weeks to approach steady state, so short cycles end before the compound reaches full effect. Community protocols typically run 10–14 weeks to match that kinetics.
Does boldenone raise red blood cell count?
Yes; erythropoiesis stimulation is pronounced, which is part of why it interested clinicians originally. Hematocrit monitoring matters, especially stacked with other androgens. Weak aromatization means fewer estrogenic effects, not fewer cardiovascular ones.
References
- PubMed (boldenone PK)
- Boldenone pharmacokinetics (PubMed) — Primary PK source; the human data behind it is limited and largely extrapolated.
Related articles
Related compounds
Boldenone Cypionate
Boldenone with a cypionate ester. Model inherited from testosterone cypionate — treat as approximate.
Dihydroboldenone (DHB)
1-testosterone (DHB); potent, non-aromatizing. Limited human PK data.
Testosterone Enanthate
Long-acting testosterone ester; the most common TRT and cycle base. Reaches steady state in ~5 weeks.
Protocols featuring Boldenone Undecylenate (Equipoise)
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