This information is for research and educational purposes only. No medical recommendations. Products are not approved for human use. For health questions, consult a doctor.

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Muscle & performance

Equipoise (Boldenone Undecylenate)

The slow building steroid - mild gains, increased appetite, EPO-like effect.

1 min read 2 sources Titration Updated June 2026

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Class: Testosterone derivative (very long undecylenate ester)
Use: Intramuscular or subcutaneous, 1x per week
Half-life: about 14 days
WADA: banned (anabolic)

Getting started

Typical dosing (research context)

Per-week figures in mg. Very long ester - builds over many weeks, hence long cycles.

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What is Equipoise?

Equipoise (Boldenone Undecylenate, EQ) is a testosterone derivative with an extra double bond and a very long undecylenate ester. It builds slowly and mildly, is known for its appetite-increasing effect and a marked increase in red blood cells (EPO-like, more endurance/pump). Originally from veterinary medicine.

This information is for research and educational purposes only. No medical advice.

How it works

Boldenone activates the androgen receptor and markedly raises erythropoiesis (red blood cell formation). It aromatizes mildly (about half as much as testosterone). Gains are slow but qualitatively "clean" and well retained.

Use and dosing

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What the research shows

Boldenone is primarily veterinary; human studies are scarce. The AAS pharmacology (Kicman 2008, Hartgens & Kuipers 2004) describes the properties as a mildly aromatizing testosterone derivative.

Side effects

Hematocrit: the marked EPO effect can thicken the blood - monitor regularly.
Estrogen: mildly aromatizing, AI if needed.
HPTA suppression: PCT topic.
Some report increased anxiety/restlessness at high doses.

Storage

Store the oil solution at room temperature, protected from light - no fridge needed. Out of reach of children.

Practice

PCT / after coming off

Anabolic substances suppress the body's own testosterone production in the research context. Anyone who comes off a cycle (rather than running it continuously) typically uses a post-cycle therapy (PCT) to restart the natural axis (HPTA).

The standard scheme in the research/literature context combines a SERM (tamoxifen and/or clomifene, alternatively enclomiphene) over roughly four weeks, optionally preceded by HCG to re-sensitise the testes before the SERM block. An aromatase inhibitor (anastrozole/exemestane) belongs more to on-cycle estrogen control than to the PCT itself.

Tip: order the PCT items together with the cycle so they are already on hand when you come off.

This information serves research and educational purposes only. Not medical advice.

Tamoxifen (Nolvadex) SERM, core of PCT Clomid (Clomifen) SERM, core of PCT Enclomiphene (Androxal) SERM alternative HCG testicular restart before PCT Arimidex (Anastrozole) aromatase inhibitor, on-cycle Aromasin (Exemestane) aromatase inhibitor, on-cycle

Evidence

Sources

1 Pharmacology of anabolic steroids - comprehensive review. Kicman, Br J Pharmacol, 2008
2 Effects of androgenic-anabolic steroids in athletes. Hartgens & Kuipers, Sports Med, 2004

Keep reading

More in the lexicon

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Equipoise (Boldenone Undecylenate) in the catalog

Sizes, prices and availability for research use. Straight from the lexicon to the product page.

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