Boldenone (Equipoise)
Also known as: EQ, Equipoise, Boldenone, Boldo
Very long-acting injectable with slow onset, known for a steady increase in appetite and red blood cell production — and for hematocrit values that rise further than with almost any other compound.
Substance family
Built on the testosterone skeleton. Most convert to estradiol via aromatase, which is why estrogen management is a topic here — water retention, gynecomastia risk, and the option of an aromatase inhibitor.
Effects on
Which outcomes this substance acts on — descriptive, not a recommendation.
Strain profile
Where this substance is most likely to hit — a rough orientation, individually dependent on dose, duration and predisposition.
Ester variants
Same active substance, same risk profile — only release rate and injection rhythm differ. The ester determines the timing, not the effect.
| Variant | Half-life | Injection interval |
|---|---|---|
| UndecylenateEQ, EquipoisePractically the only form in circulation. One of the longest esters at all — noticeable effects take 4–6 weeks. | ~14 days | 1–2× / week |
| CypionateBold CypRare. Shortens both the ramp-up and the carry-over considerably, but is hard to obtain. | ~5–6 days | 1–2× / week |
The ester also determines how long the substance stays active after the last injection — relevant when planning a recovery phase.
Dosing & protocols by goal
Rough orientation ranges as reported in harm-reduction literature — not an individual treatment plan. Doses are individual and open-ended; frequency depends on the ester or half-life.
Not medically indicated
MedicalDose
—
Frequency
—
Cycle length
—
No human-medical indication. Boldenone was developed for veterinary use, primarily in horses.
Mass building — Intermediate
IntermediateDose
300–600 mg / week
Frequency
1–2× / week
Cycle length
16–20 weeks
Cycles are run longer than usual because the effect only builds noticeably after 4–6 weeks. Shorter runs largely miss the point of the compound.
Higher doses
AdvancedDose
> 600 mg / week
Frequency
1–2× / week
Cycle length
Varies
HematocritHematocritThe percentage of blood made up of red cells — rises on androgens and thickens the blood. becomes the limiting factor long before the anabolic effect scales further.
Side effect & countermeasure
Typical problems and what you can do to reduce harm — at a glance. Does not replace medical monitoring.
Problem
Strongly elevated hematocrit — the characteristic problem of this compound
Countermeasure
Check hematocrithematocritThe percentage of blood made up of red cells — rises on androgens and thickens the blood. and hemoglobin every 6–8 weeks, not just at the end. Cardio and generous hydration; donating blood is the most effective measure when values climb. Above roughly 54% hematocrit this is a reason to stop, not to manage. Nattokinase supports fibrinolysis but does not lower the cell count — donation remains the measure that works.
Problem
Elevated blood pressure, driven partly by the thicker blood
Countermeasure
Measure at home regularly. Cardio, control salt and water balance; medically, telmisartan, amlodipine or lisinopril, and low-dose tadalafil. Lowering hematocrithematocritThe percentage of blood made up of red cells — rises on androgens and thickens the blood. usually improves blood pressure at the same time.
Problem
Aromatization to estradiol (water retention, gynecomastia risk)
Countermeasure
Boldenone aromatizesaromatizesThe body converting testosterone into estrogen via the aromatase enzyme. about half as strongly as testosterone but does so steadily. Measure estradiolestradiolThe main estrogen — needed in men too, and damaging in both directions when out of range. rather than guessing; if genuinely needed, anastrozole in the lowest effective dose — do not crash it.
Problem
Unfavourable lipid profile (HDL drops)
Countermeasure
Milder than with the DHTDHTA far more potent androgen the body makes from testosterone — responsible for hair loss and prostate effects. derivatives, but relevant over long cycles: cardio, omega-3, possibly citrus bergamot. Because runs last 16+ weeks, check the lipid panel mid-cycle rather than only afterwards.
Problem
Restlessness and anxiety
Countermeasure
Frequently reported and dose-dependent. If it appears, lower the dose — with an esteresterA chemical chain attached to a steroid to slow its release from the injection site. this long, stopping takes weeks to take effect, so react early.
Problem
Very long carry-over after the last injection
Countermeasure
The undecylenate esteresterA chemical chain attached to a steroid to slow its release from the injection site. releases for weeks. Use the ester half-lifehalf-lifeHow long it takes for half the substance to leave the body — it determines dosing frequency, not duration of effect. calculator to plan the end of the cycle and stop considerably earlier than with short esters, otherwise the recovery phase starts while the substance is still active.
Problem
Marked increase in appetite
Countermeasure
Useful in a mass phase, a problem in a deficit. Plan meals in advance rather than eating by feel, and track weight weekly so the gain stays intentional.
Overview
Boldenone undecylenate is a testosterone derivative with an additional double bond in the A-ring, originally developed for veterinary medicine and still used primarily in horses. It has never been approved as a human medicine, so there is no clinical data on long-term effects in people.
In the bodybuilding context, it is known for two things above all: a pronounced increase in appetite and a marked rise in red blood cell production. Both stem from the same profile — and the second is precisely what makes this substance require monitoring, despite otherwise moderate side effects.
Mechanism of Action
Structurally, boldenone is testosterone with a double bond between carbon atoms 1 and 2. This modification reduces its conversion to estradiol to roughly half that of testosterone and increases stability against enzymatic breakdown.
The effect on erythropoiesis — the formation of red blood cells — is more pronounced than with most other anabolic steroids. All androgens raise hematocrit; boldenone does so particularly reliably and particularly persistently. Higher hematocrit means thicker blood, which raises both blood pressure and cardiovascular risk.
The undecylenate ester is the longest in common circulation. It determines the practical rhythm of the substance: noticeable effects only appear after four to six weeks, and after the last injection it continues to release for a comparably long stretch.
Typical Context
Boldenone is used in longer mass phases, generally over sixteen to twenty weeks, and practically always alongside a testosterone base. The long ramp-up is the reason for those cycle lengths — a run of eight weeks would end roughly when the effect is beginning to establish itself.
The increase in appetite is a genuine part of the effect profile and is often the reason it is chosen for a mass phase. In a deficit, this same property turns into a disadvantage.
Side Effects & Risks
- Markedly elevated hematocrit and hemoglobin — the leading side effect
- Elevated blood pressure, partly as a consequence of the thicker blood
- Aromatization to estradiol, roughly half as strong as testosterone but steady
- Shift in the lipid profile (HDL drops), moderate but relevant over long cycles
- Restlessness and anxiety, described frequently and dose-dependent
- Suppression of natural testosterone production
- Very long carry-over after the last injection
- Acne and accelerated hair loss with a genetic predisposition
Blood Work & Monitoring
Because cycles run long, mid-cycle checks matter more here than with short compounds — a value that only gets measured at the end has been out of range for months.
- Hematocrit & hemoglobin — every 6–8 weeks, the key marker for this substance
- Blood pressure — measured at home regularly
- Estradiol (sensitive) — boldenone aromatizes; measure instead of guessing
- Lipid profile (LDL, HDL, triglycerides) — baseline, mid-cycle and after
- Total/free testosterone — to check the base
- Liver values (ALT, AST, GGT) — usually unremarkable, part of the baseline
- Ferritin — helpful for interpreting repeated blood donations
Harm-Reduction Notes
- Hematocrit is the defining limit of this compound; measure it during the cycle, not just at the end
- Blood donation is the most effective measure against rising values — plan it rather than improvising
- Do not use an aromatase inhibitor blindly; boldenone aromatizes less than testosterone and crashing estradiol causes its own problems
- Because of the very long ester, plan the end of the cycle well in advance with the half-life calculator
- Since it is a veterinary product, black-market quality varies; underdosing and mislabeling are common
- Sterile single-use needles, rotate injection sites; the large injection volumes typical here make site rotation especially relevant
Legal status by region
Regulation differs considerably between jurisdictions and changes over time. This is a rough orientation, not legal advice — check the rules that apply where you are.
| Region | Regulatory status |
|---|---|
| United States | Schedule III controlled substanceNo approved human indication; distribution is a federal offence. |
| EU / UK | Not approved for human useSome compounds exist only as veterinary products or not at all. |
| Canada / Australia | Controlled substanceNo human indication. |
| Parts of Asia & Latin America | Grey market, largely unregulatedAvailability does not imply pharmaceutical quality — underground-lab product dominates. |
| Competitive sport | Prohibited at all timesListed by WADA. |