1-Androsterone
Mechanism of Action +
### Structural Biochemistry 1-Androsterone (3β-hydroxy-5α-androst-1-en-17-one), commonly referred to as 1-DHEA, is an isomer of the naturally occurring prohormone dehydroepiandrosterone (DHEA). The critical structural divergence lies in the placement of the double bond: while standard DHEA features a double bond at the C5 position, 1-Androsterone features a double bond at the C1 position. This C1 double bond is of paramount pharmacological importance because it alters the molecule's spatial conformation, rendering it incompatible with the aromatase enzyme (CYP19A1). Consequently, 1-Androsterone and its downstream metabolites cannot be aromatized into estrogenic compounds like estradiol, eliminating the risk of estrogen-mediated side effects such as gynecomastia and water retention.
### Enzymatic Conversion Pathway In its native state, 1-Androsterone is largely inactive and must function as a prohormone. Upon ingestion and systemic absorption, it relies on two primary steroidogenic enzymes to convert into its target active androgen, 1-testosterone (17β-hydroxy-5α-androst-1-en-3-one), also known as dihydroboldenone.
This conversion occurs via a two-step process utilizing 3β-hydroxysteroid dehydrogenase (3β-HSD) and 17β-hydroxysteroid dehydrogenase (17β-HSD). The pathway can proceed in two directions: 1. **Pathway A:** 17β-HSD reduces the 17-ketone group of 1-Androsterone to a 17β-hydroxyl group, forming the intermediate 1-androstenediol. Subsequently, 3β-HSD oxidizes the 3β-hydroxyl group to a 3-ketone, yielding 1-testosterone. 2. **Pathway B:** 3β-HSD oxidizes the 3β-hydroxyl group first, forming the intermediate 1-androstenedione. Then, 17β-HSD reduces the 17-ketone, yielding 1-testosterone.
### Androgen Receptor Activation Once converted, 1-testosterone exhibits a highly favorable anabolic-to-androgenic ratio. It binds with high affinity to the intracellular androgen receptor (AR) located in the cytosol of skeletal muscle cells. Upon binding, the AR undergoes a conformational change, dissociates from heat shock proteins, dimerizes, and translocates into the nucleus. There, it binds to androgen response elements (AREs) on the DNA, recruiting coactivators to modulate the transcription of target genes. This process upregulates the expression of insulin-like growth factor 1 (IGF-1) and downregulates myostatin, culminating in robust skeletal muscle hypertrophy and increased myofibrillar protein synthesis.
### Pharmacokinetics and Delivery Systems Unmodified 1-Androsterone suffers from exceptionally poor oral bioavailability (often estimated at less than 5%) due to extensive first-pass hepatic metabolism. In the liver and intestinal wall, it is rapidly subjected to phase II metabolism, primarily glucuronidation and sulfation, rendering it inactive and marking it for renal excretion. To circumvent this pharmacokinetic hurdle, modern sports nutrition formulations frequently employ advanced delivery vectors. Cyclodextrin complexation (such as hydroxypropyl-beta-cyclodextrin) is used to increase aqueous solubility and sublingual absorption, while liposomal encapsulation is utilized to protect the molecule from hepatic degradation by routing it through the lymphatic system via chylomicrons.
What does androsterone do? +
What does andro 1 do? +
Is androsterone the same as DHEA? +
Is androsterone the same as testosterone? +
What medications should not be taken with testosterone? +
Is androsterone a steroid? +
What are the negative side effects of testosterone boosters? +
How does androsterone affect the body? +
Does 1-Andro cause hair loss? +
Do I need a PCT for 1-Andro? +
Does 1-Andro aromatize into estrogen? +
What is 1-Andro lethargy? +
How long should a 1-Andro cycle last? +
Can women take 1-Andro? +
Is 1-Andro legal? +
What is the best dosage for 1-Andro? +
Should I take 1-Andro with food? +
Everything About 1-Androsterone Article
## What is 1-Androsterone?
1-Androsterone, commonly known as 1-Andro or 1-DHEA, is a powerful, non-methylated prohormone utilized by bodybuilders and strength athletes to rapidly increase lean muscle mass and strength. Chemically identified as 3β-hydroxy-5α-androst-1-en-17-one, it is an isomer of the naturally occurring hormone DHEA. However, unlike standard DHEA, 1-Androsterone features a unique double bond at the 1st carbon position. This structural nuance is the secret to its popularity: it completely prevents the molecule from aromatizing into estrogen.
When you consume 1-Androsterone, it is inactive on its own. It must travel through the body and interact with specific enzymes (3b-HSD and 17b-HSD) to undergo a two-step conversion process. The end result of this conversion is 1-testosterone (dihydroboldenone), a highly potent androgenic and anabolic compound that is significantly stronger than base testosterone.
## The Science Behind the Muscle
According to clinical data compiled by Examine.com, 1-Androsterone has a notable effect on muscle mass (graded as a 'C' level of evidence based on limited human trials) and a minor effect on fat mass reduction. In the primary clinical trial evaluating its efficacy, resistance-trained males taking 330 mg of 1-Androsterone per day experienced significant increases in lean body mass compared to placebo.
Once converted to 1-testosterone, the hormone binds directly to androgen receptors inside muscle cells. This binding triggers a cascade of genetic transcriptions that upregulate insulin-like growth factor 1 (IGF-1) and downregulate myostatin (a protein that limits muscle growth). The result is a dramatic increase in myofibrillar protein synthesis—your body's ability to build new muscle tissue from dietary protein.
Because 1-Androsterone cannot convert to estrogen, the weight gained during a cycle is entirely 'dry' lean tissue. Users do not experience the subcutaneous water retention or 'bloat' often associated with other muscle-building compounds.
## Dosage and Delivery Systems
Clinical studies have utilized a dosage of 330 mg per day, typically split into three 110 mg doses to maintain stable blood plasma levels. However, a look at the commercial supplement market reveals that many products dose 1-Androsterone at 50 mg to 100 mg per serving.
Why the discrepancy? Unmodified 1-Androsterone has notoriously poor oral bioavailability. If you swallow a raw 1-Andro powder, the liver destroys the vast majority of it before it ever reaches your bloodstream. To combat this, modern formulations use liposomal encapsulation or cyclodextrin complexation. These advanced delivery systems protect the prohormone from liver breakdown, meaning a 50 mg liposomal dose may yield higher active blood levels than a 300 mg unencapsulated dose.
## Risks, Side Effects, and Safety
While 1-Androsterone is highly effective for building muscle, it is not without significant risks. As noted by the Mayo Clinic and Drugs.com regarding performance-enhancing androgens, introducing exogenous hormones into the body carries severe potential side effects.
**Cardiovascular Strain:** The most clinically significant side effect of 1-Androsterone is its devastating impact on lipid profiles. It drastically reduces HDL (good cholesterol) and elevates LDL (bad cholesterol), which can increase blood pressure and the risk of major adverse cardiovascular events (MACE).
**Testosterone Suppression:** Because 1-Androsterone floods the body with exogenous androgens, the hypothalamus and pituitary gland signal the testes to shut down natural testosterone production. Post Cycle Therapy (PCT) is absolutely mandatory after a 1-Andro cycle to restart the body's natural endocrine function.
**1-Andro Lethargy:** A unique side effect of 1-Androsterone is profound lethargy. Because the body's natural testosterone is shut down, and 1-Andro cannot convert to estrogen, the body becomes starved of estrogen. Estrogen is critical for energy, mood, and joint lubrication. Many users stack 1-Andro with 4-Andro (which does convert to estrogen) to combat this lethargy.
**Organ Stress:** While non-methylated prohormones are less liver-toxic than older methylated designer steroids, they still require hepatic processing. Liver support supplements (like TUDCA or NAC) are highly recommended during use.
## Who Should Avoid 1-Androsterone?
1-Androsterone is strictly for healthy adult males over the age of 21. Women should absolutely avoid 1-Androsterone due to the high risk of virilization (development of male physical characteristics like a deepened voice and facial hair). Furthermore, individuals with a history of high blood pressure, high cholesterol, liver issues, or prostate enlargement should avoid this compound entirely.