Overview
DHB / 1-Testosterone is a testosterone ester used in hormone replacement and performance protocols. It has a half-life of ~6 days (144 hours). It is tracked in Milligram with one-compartment pharmacokinetic modeling for accurate level predictions.
With a half-life of ~6 days (144 hours), DHB / 1-Testosterone supports less frequent dosing schedules. Administered via IM injection, it has a bioavailability of approximately 95% via its primary route.
Half-life approximately 6 days. Does not undergo aromatization. One-compartment model.
Mechanism of Action
DHB / 1-Testosterone's pharmacological activity involves the following key pathways:
Androgen Receptor Binding
DHB / 1-Testosterone binds to androgen receptors in skeletal muscle and other tissues, initiating transcription of androgen-responsive genes involved in protein synthesis and nitrogen retention.
Non-Aromatizing
DHB / 1-Testosterone does not undergo aromatization to estrogen, which is a distinguishing pharmacological property among anabolic compounds.
Ester Hydrolysis
After injection, the ester bond is cleaved by esterase enzymes, releasing free testosterone into circulation. The ester length determines the rate of release and thus the half-life.
Dosing Protocols
The following protocols represent commonly observed dosing patterns. These are observational summaries, not recommendations.
Dose
200 mg/week
Route
Intramuscular
Frequency
2x per week
Duration
8-16 weeks
Dose
400 mg/week
Route
Intramuscular
Frequency
2x per week
Duration
8-16 weeks
Frequently Asked Questions
What is DHB (1-Testosterone) and how is it different from regular testosterone?
DHB, also known as Dihydroboldenone or 1-Testosterone, is the 5-alpha reduced form of Boldenone – in the same way that DHT (dihydrotestosterone) is the 5-alpha reduced form of regular testosterone. Unlike testosterone, DHB does not aromatize to estrogen, which means users do not observe the estrogenic side effects (water retention, gynecomastia) commonly associated with testosterone. It is typically available as the cypionate ester (Dihydroboldenone Cypionate), giving it a half-life of approximately 48 hours. Despite the '1-Testosterone' name, it is a distinct compound from testosterone and is not typically used for hormone replacement therapy.
Does DHB aromatize to estrogen?
DHB is commonly reported to be non-aromatizing – it does not convert to estrogen via the aromatase enzyme. This property is considered one of its primary appeals: users typically observe lean, dry muscle gains without the water retention associated with aromatizing androgens. However, because endogenous testosterone production is suppressed during any exogenous androgen cycle, some users choose to run DHB alongside a testosterone base to maintain estrogen at a physiological level, as excessively low estrogen carries its own commonly observed effects on joints, mood, and libido.
What is post-injection pain (PIP) with DHB and why does it occur?
DHB (1-Testosterone Cypionate) is widely reported to cause significant post-injection pain – often described as one of the most painful injectable compounds available. The pain, which typically peaks 24 – 48 hours after injection and can last several days, is believed to result from the compound's crystalline nature and the high concentration at which it is often brewed (100 – 200 mg/mL). Common mitigation strategies reported by users include injecting slowly, using a larger injection volume to dilute the compound, warming the oil before injection, and blending with a higher proportion of carrier oil (e.g. miglyol or MCT oil with higher benzyl benzoate content).
How does DHB compare to Primobolan (Methenolone)?
DHB and Primobolan are frequently compared as both are considered 'dry', non-aromatizing compounds associated with lean muscle gains. DHB is generally regarded as more anabolic and androgenic than Primobolan – users commonly report more pronounced strength and muscle gains from DHB at equivalent doses. Primobolan is typically considered milder and better tolerated, with less androgenic activity and a more established safety profile. DHB's significant post-injection pain is a practical limitation Primobolan does not share. Both suppress natural testosterone production and are typically run with a testosterone base.
What cycle length and dose is DHB commonly used at?
Due to its 48-hour half-life, DHB reaches steady state relatively quickly – approximately 10 days with consistent dosing. Users commonly report doses in the range of 200 – 400 mg per week, injected in split doses (e.g. every other day or twice weekly) to maintain stable levels given the relatively short half-life. Cycle lengths of 10 – 14 weeks are most commonly reported. Higher doses (above 400 mg/week) are associated with increased androgenic effects without a proportional benefit according to user reports, and the post-injection pain becomes more pronounced at higher concentrations.
Is DHB detectable on a drug test?
Yes – DHB (Dihydroboldenone) is detectable under WADA-compliant anti-doping testing. It appears on the World Anti-Doping Agency's prohibited list as an exogenous anabolic androgenic steroid. Urine detection windows vary based on dose, individual metabolism, and testing sensitivity, but detection is possible for several weeks after the last injection. Users subject to sports drug testing should be aware that DHB, like all exogenous androgens, will produce a positive result.