1-TEST CYP (Dihydroboldenone Cypionate / DHB)


Dihydroboldenone (DHB), aka 1-testosterone (this product: 1-TEST CYP), is a 5α (5-alpha) reduced form of the steroid boldenone. The 5α-reductase enzyme is famous for reducing testosterone to DHT in humans, but with boldenone this reduction doesn’t work so well due to extremely low binding affinity. Because of this, it’s better to acquire DHB directly if seeking its benefits (boldenone and DHB have different side effect and benefit profiles). Our product is synthesized with a cypionate ester, and exhibits a half-life similar to other cypionate ester compounds (~6 days).
1-TEST CYP is:

  • structurally identical to methenolone, except for the 1-methylation of methenolone.
  • structurally identical to testosterone, except for a double bond between C-1 and C-2 in its A-ring that has instead moved between C-4 and C-5.
  • structurally identical to boldenone, except for stereospecific break of the double bond between C-1 and C-2 (Boldenone has double bond between both C-1==C-2 and C-4==C-5).

Some female athletes may be inclined to use 1-TEST-CYP. The potential for development of symptoms of virilization still remain but are not as severe as with synthetic Testosterone or other harsher drugs. This does not imply this is a mild drug. To simplify the explanation of exactly what 1-TEST-CYP is, it is to Boldenone as Dihydrotestosterone (DHT) is to Testosterone. This explains why the effects of 1-TEST-CYP, both positive and negative, are so dissimilar to those of boldenone. Dihydroboldenone, like dihydrotestosterone does not convert to anything else past that compound.

1-TEST-CYP, while not overly androgenic, is a potent anabolic. 1-TEST-CYP has been demonstrated to bind extremely well and selectively to the androgen receptor and stimulates androgen receptor transactivation of dependent reporter genes. This equates to a drug that possesses the ability to stimulate significant muscle growth while not producing androgenic side effects. 1-TEST-CYP has been shown to be far more anabolic than such compounds as boldenone, nandrolone, and even testosterone itself. Obviously this is of great benefit to many athletes and bodybuilders.

Anecdotally some users have indicated post-injection pain (PIP) with 1-TEST-CYP. Diluting the drug with either another injectable drug or some other type of sterile oil seems to alleviate at least some of this discomfort. The type of ester used does not appear to negate this pain for the users that experience it however. Keep in mind, proper injection technique is essential to mitigate PIP of most compounds, but especially ANY compounds that are not oil-carrier based or have high concentrations. Insufficient injection depth/bad technique can allow some of the injected compound to escape the muscle depot up into the subcutaneous space, which can create inflammation, irritation, and discomfort. We strongly recommend researching and applying techniques such as “Z-Track injection” for the best experience.


Dilution REQUIRED before use.
Consider yourself warned.
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Before Placing Your Order:

Please read our FAQ to understand more about the ordering process.
Packaging: Single vial with silicone stopper, containing 10ml of product.

Dosage & administration:

Half life
6 days
Adult dose (male)
100-400mg per injection E4D for 4 -10 weeks as required
Average Cycle Length
300-1200mg per week over 4-10 weeks gives the best results
Anabolic #
Androgenic #
IM Bioavailability
Estimated at 100%
CAS Name
17beta-hydroxyandrost-1-en-3-one, 5alpha-androst-1-en-3-one, 17beta-ol