Boldenone 250 (Boldenone Undecylenate 250 mg/ml)

Boldenone 250 (Boldenone Undecylenate 250 mg/ml) is Evolve Biolabs' classic equipoise presentation, supplied as a 10 ml multi-dose vial. The long undecylenate ester provides slow, sustained release at the standard 250 mg/ml concentration.

What Boldenone 250 Is

Boldenone 250 is boldenone undecylenate in an oil carrier at 250 mg per millilitre, the strength most closely associated with traditional Equipoise. Boldenone itself is a testosterone analogue with an extra double bond in the A-ring, which makes it less prone to aromatisation than testosterone while preserving anabolic activity. The undecylenate ester extends the release window to several weeks. Each 10 ml vial contains 2,500 mg of the ester.

The History of Boldenone

Boldenone was synthesised in the late 1940s and introduced clinically in the 1950s as Parenabol before finding its lasting identity as the veterinary product Equipoise. In livestock and equine practice it was valued for improving appetite and feed conversion, and those observations carried into physique research. The 250 mg/ml strength became the reference concentration, and it remains the yardstick against which higher-strength boldenone products are compared.

How It Works

Esterases in muscle and plasma hydrolyse the undecylenate group over a period of weeks, releasing free boldenone gradually. The hormone binds the androgen receptor and promotes nitrogen retention and protein synthesis. A portion is aromatised to oestradiol and a portion reduced to a 5-alpha metabolite, giving a mixed hormonal profile. Because release is slow, blood levels rise and fall gently, but clearance after the final injection is correspondingly prolonged.

What the Research Shows

• Equine and bovine studies document boldenone's effects on appetite, weight gain and feed efficiency.
• Residue analysis has characterised its long detection window in urine and hair.
• The undecylenate ester is established as a slow-release prodrug.
• Human pharmacokinetic data remains sparse compared with veterinary evidence.

Research Context

Boldenone's reputation for increasing appetite is one of the more consistent observations in veterinary research, and it has shaped how the compound is described in physique literature. Analytical work has also shown that boldenone metabolites can persist far longer than the parent ester's visible activity, which complicates any assumption about washout. Those findings are important for anyone reading detection studies or comparing boldenone with faster-clearing injectables.

Strength, Pack and Authentication

Each millilitre contains 250 mg of boldenone undecylenate, for 2,500 mg per 10 ml vial. The vial is filled under controlled conditions, sealed with a flip-off cap and packed in a printed, tamper-evident carton showing the compound, strength and volume. A verification code on the carton allows the pack to be checked against Evolve Biolabs' records.

Buying Boldenone 250 Online

Boldenone 250 remains one of the most searched long-ester injectables. If you are researching equipoise, comparing boldenone undecylenate 250 products or looking to buy Boldenone 250 online from a verified Evolve Biolabs supplier, this page gives you the complete specification, pack size, price and live stock status. Browse more Evolve Biolabs injectables at NotNatty.