What Is Equipoise? Half-Life, Dosing Math & How to Track It
Also known as: Boldenone · Boldenone Undecylenate · EQ · Ganabol
Equipoise is the trade name for boldenone undecylenate, a testosterone-derived anabolic steroid attached to one of the longest common AAS esters — undecylenate, half-life roughly 14 days. About 63% of the milligrams in the vial are boldenone itself. It aromatizes to estrogen at roughly half testosterone’s rate but is notable for stimulating red blood cell production more than most AAS, which makes hematocrit the single most important thing to monitor. Educational only; not a recommendation to use.
What Equipoise is and how it works
Equipoise is the trade name most associated with boldenone undecylenate — boldenone is structurally very close to testosterone, differing by one extra double bond, and was originally developed as a veterinary drug (sold to this day as Ganabol and similar names) rather than for human medical use.
Because its structure is so close to testosterone’s, boldenone does aromatize to estrogen through the same enzyme — just at roughly half the rate testosterone does. It is also notable among AAS for stimulating erythropoietin, the hormone that drives red blood cell production, more than most comparable compounds — a property that carries directly into what needs monitoring.
About 63% of the milligrams in boldenone undecylenate are boldenone itself; the undecylenate ester makes up the rest and is what gives the compound one of the longest release profiles of any common injectable AAS.
Dosing math & the mg/mL trap
Equipoise is labeled by concentration like any injectable ester: volume (mL) = dose (mg) ÷ concentration (mg/mL). Because the ester is so long and per-injection amounts tend to be larger given the weekly-or-less frequency, small concentration mix-ups translate into larger absolute volume errors.
If splitting a weekly total across two injections, divide by two before applying the volume formula — the same math either way, just applied to a smaller per-shot amount.
| Amount | 200 mg/mL | 300 mg/mL | 400 mg/mL |
|---|---|---|---|
| 200 mg | 1.00 mL (100u) | 0.67 mL (67u) | 0.50 mL (50u) |
| 300 mg | 1.50 mL (150u) | 1.00 mL (100u) | 0.75 mL (75u) |
| 400 mg | 2.00 mL (200u) | 1.33 mL (133u) | 1.00 mL (100u) |
Volume to draw at three reference concentrations (U-100 syringe units in parentheses). Reference numbers for the arithmetic only — the HRT tab of the calculator handles any concentration.
Half-life & what it means for frequency
At roughly 14 days, the undecylenate ester’s half-life is among the longest of the common injectable esters — long enough that Equipoise is usually run weekly or twice weekly, and long enough that it can take roughly 8–10 weeks of consistent injections before blood levels stop climbing and settle at steady state.
That slow build has a mirror image on the way out: after the last injection, boldenone stays in circulation and physiologically active for months, not weeks — worth planning around if hematocrit or lipids need to come back down.
What to monitor & the real risks
Hematocrit is the headline monitoring point for Equipoise specifically: its erythropoietin-stimulating effect can push red blood cell concentration up meaningfully, and thicker blood raises the risk of clots and elevated blood pressure. A baseline CBC before starting and periodic rechecks are the standard approach — this is not a “check once and forget” number for boldenone.
Because it does aromatize, though at a lower rate than testosterone, estradiol is still worth tracking, along with a lipid panel and, as with any AAS, total/free testosterone and LH/FSH given HPTA suppression. The long ester means all of these move slowly — which argues for monitoring on a longer, more patient cadence rather than expecting week-to-week change.
How to track Equipoise in Stackeddd
Log every Equipoise injection with its dose and site, and keep hematocrit — the marker that matters most here — trending alongside estradiol, lipids, and testosterone. With a ~14-day ester, the pattern only tells you something once you have several weeks of consistent logging behind it.
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Dosing Calculator (HRT tab)
Model it yourself: enter your dose and vial concentration on the HRT tab and get the exact mL and syringe units for any amount — the same math built into the Stackeddd app.
Related compounds
Related reading: TRT Math: what mg/mL actually means · Injection frequency: daily vs EOD vs weekly
Frequently asked questions
What is Equipoise’s generic name?
Boldenone undecylenate. Equipoise is the trade name, originally developed as a veterinary drug for horses (also sold as Ganabol) rather than for human medical use.
What is the half-life of Equipoise?
Roughly 14 days for the undecylenate ester — one of the longest common AAS esters — which means it can take roughly 8–10 weeks to reach a steady blood level and stays active for months after the last injection.
How do you calculate an Equipoise dose in mL?
Volume (mL) = dose (mg) ÷ concentration (mg/mL). A 300 mg amount from a 300 mg/mL vial is 1.00 mL, or 100 units on a U-100 syringe. The HRT tab of the calculator handles any concentration.
What should I monitor on Equipoise?
Hematocrit above all — boldenone stimulates red blood cell production more than most AAS, raising clot and blood-pressure risk if it climbs unchecked. Estradiol, a lipid panel, and total/free testosterone with LH/FSH round out a reasonable panel.
This is educational information, not medical advice. Doses and protocols above reflect published references and community practice — protocol decisions belong with your prescribing physician. Generic names used throughout. How this reference is built & how the AI is tested →
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