Promestanolone

Diagram of molecule

Chemical Name(s):
17a-methyl etioallocholan 17b-ol 3-hydroxyimine
Chemical Formula: C20H33NO2
Molecular Weight: 319.5
CAS: NA
Q Qatio: 2.4
Anabolic #: 380/24
Androgenic #: 158/20
Oral Bioavailability: Estimated at 40%
AR Binding Affinity: NA
SHBG Binding Affinity: High
Half Life: NA
Legal Status (US): Not listed as a controlled substance
Average Dose:
75-100mg/day standalone
50-75mg/day when stacking
Average Cycle Length: 4-6 weeks
Stimulator
Inhibitor

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Muscle Gain

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Strength Gain

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Fat Gain (negative indicates fat loss)

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Water Retention (extra-cellular bloat)

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Aggression

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Libido

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Acne

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Hair Loss

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Prostate Enlargement

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Liver Toxicity

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Lethargy

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Characteristics

Promestanolone is a 17aa pro-steroid which converts to the illegal anabolic steroid methyl-DHT (mestanolone).

There is no human clinical data on promestanolone, but it is most likely exerting its effects by converting to methyl-DHT. The acidic environment in the stomach would be responsible for converting the 3-hydroxyimine group to a 3-one — thus rapidly changing it to methyl DHT. Therefore results and side-effects would be considered to be very similar to methyl-DHT.

Although DHT can be deactivated in skeletal muscle tissue by 3b-HSD it is likely that this enzyme pathway can be overwhelmed if this compound is taken at a high enough dose. Methyl-DHT has some activity on the progestin receptor, but not to a high degree. It has moderate anabolic but high androgenic effects. It binds strongly to SHBG, therefore free testosterone and estrogen can be expected to rise by displacement from SHBG.

Since this is a 17aa compound, liver toxicity will be an issue with high doses or long term use. For this reason users should consider priming the liver with a liver supporting supplement before and during a Promestanolone cycle. Users will also experience minimal subcutaneous water retention since there is no conversion to estrogen. However, intracellular water and sodium retention will increase by inhibition of 11-beta hydroxylase and mineralocorticoid build up.

Users may also experience an increase in aggression and mood swings which is a common side effect of many steroids with high androgenic value. This makes this compound an excellent pre-lifting or pre-competition steroid.

Promestanolone should produce solid lean gains in muscle as a standalone. However for those looking to add additional bulk to their cycle, promestanolone would stack with with virtually any other non-17aa oral.

Common Clones:

D-Plex by Competetive Edge Labs (CEL)
The ONE by Applied Nutraceuticals


Related Discussion

The Official Promestanolone Thread
Posted by Eric

References

“Effect of 1-alkyl substitution on the biological action in a series of androstanes.”

Cekan Z, Pelc B.
Steroids. 1966 Aug;8(2):209-18.

“Relative binding affinity of anabolic-androgenic steroids: comparison of the binding to the androgen receptors in skeletal muscle and in prostate, as well as to sex hormone-binding globulin.”
Saartok T, Dahlberg E, Gustafsson JA.
Endocrinology. 1984 Jun;114(6):2100-6.

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Insulin’s Effect on Blood Pressure

lower blood pressureFebruary 19th, 2010 – In a previous article, I talked about how high carbohydrate diets can increase triglycerides (blood fats), or high cholesterol. It also appears that high carbohydrate consumption can increase hypertension, or high blood pressure.  Check this out.

It’s not actually the carbohydrates doing the damage; rather it’s their corresponding hormone – insulin.  The more carbs we eat, the more insulin our bodies pump into the blood stream to shuttle the glucose into cells for storage.  When we are in a hyperinsulinemic (high insulin) state, like the one you’re in when you eat a high carbohydrate diet, the kidneys will retain more sodium than normal. (1)  This is the body’s protective mechanism to maintain proper electrolyte balance, by retaining water to keep the sodium sufficiently diluted.  More water leads to increased blood volume, and thus more pressure on the walls of the blood vessels.

Insulin also stimulates the smooth muscle cells of the arterial walls, acting like a growth hormone and causing them to enlarge and thicken. (2) As they grow, the interior space of the blood vessels decreases, which further increases blood pressure.  Combine narrowed vessels with increased blood volume and you have a perfect recipe for a heart attack.

References –

1. Insulin and renal sodium retention in obese adolescents.

Rocchini AP, Katch V, Kveselis D, Moorehead C, Martin M, Lampman R, Gregory M.

Hypertension. 1989 Oct;14(4):367-74  PMID: 2676858

2. Protein Power

Dr. Michael Eades

New York, NY: Creative Paradox LLC (2000)

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