STROMUSC Premium YK11 10mg For Bodybuilding CAS:1370003-76-1

    What is YK-11?

    YK-11, chemically known as (17S)-17-hydroxy-17-methyl-2-oxa-5α-androst-1-en-3-one, is a synthetic steroidal compound often misclassified as a Selective Androgen Receptor Modulator (SARM). In reality, its mechanism is more complex and unique. It is a partial agonist of the androgen receptor (AR), but its defining characteristic is its function as a potent myostatin inhibitor. Myostatin is a protein that acts as a primary negative regulator of muscle growth, limiting skeletal muscle size. By disrupting myostatin signaling, YK-11 theoretically removes a fundamental biological brake on hypertrophy. This dual-pathway approach-moderately stimulating the AR while significantly inhibiting a growth-limiting factor-places it in a novel and poorly understood category of performance-enhancing research chemicals.

    ●Dual Mechanism: Unlike pure anabolic steroids (full AR agonists) or classic SARMs (tissue-selective AR agonists), YK-11 operates on two fronts. It exhibits moderate binding to the androgen receptor, promoting anabolic signaling. Concurrently, it interferes with the myostatin pathway, preventing it from binding to its receptor (ActRIIB) and thus halting the signal that tells muscle cells to stop growing or even promotes breakdown.

    ●Follistatin Upregulation: Research indicates YK-11 may increase the expression of follistatin, a natural myostatin-binding protein that neutralizes myostatin's activity, thereby amplifying its muscle-growth-promoting effects.

    ●Steroidal Backbone: Despite its novel action, YK-11 possesses a steroidal structure derived from dihydrotestosterone (DHT). This is crucial because it implies the compound can be prohormone-like, potentially converting into more potent androgens via metabolic processes in vivo. This also suggests it may carry risks similar to steroids, including hepatotoxicity and strong suppression of the hypothalamic-pituitary-gonadal (HPG) axis.

    ●Non-Aromatizable: The compound does not convert to estrogen via the aromatase enzyme, eliminating risks of estrogen-related side effects like gynecomastia or water retention. However, this also means it lacks the protective cardiovascular and neurological effects of estrogen.

    Given its experimental status, any discussion of "applications" is speculative and derived from preclinical research and anecdotal reports from the research chemical community.

    ●Lean Mass Accrual Phases: The primary theorized use is during "lean bulk" or "recomp" phases, where the goal is to add skeletal muscle tissue with minimal fat or water gain, courtesy of its non-aromatizing nature and myostatin inhibition.

    ●Breaking Plateaus: For athletes who have reached a genetic or trained plateau in muscular size, the myostatin-inhibiting property is seen as a potential method to bypass natural growth limitations.

    ●Strength-Power Phases: The combined anabolic and anti-catabolic (via myostatin inhibition) effects could theoretically support significant gains in absolute strength and power output.

    Purported Benefits (Anecdotal/Theoretical):

    ●High-Quality Muscle Growth: Potential for dense, lean, and dry muscular gains due to lack of estrogenic bloat.

    ●Enhanced Muscle Hardness and Density: Often reported as a pronounced "full" and hard look to the muscles.

    ●Rapid Strength Increases: Users frequently report disproportionate strength gains relative to muscle size.

    ●Joint and Tendon Strengthening: Some data suggests myostatin inhibition may positively affect connective tissue, though this is highly speculative for YK-11 specifically.

    Substantial Risks & Side Effects:

    ●Profound Hormonal Suppression: As a steroidal AR agonist, it will suppress natural testosterone production severely, necessitating Post-Cycle Therapy (PCT).

    ●Hepatotoxicity: The steroidal structure, particularly the 17-alpha methylation (common in oral steroids), is likely stressful to the liver. Liver enzyme elevations are a common concern.

    ●Androgenic Side Effects: Despite being a partial agonist, its DHT-derived structure can trigger androgenic effects like accelerated hair loss, increased body hair growth, and acne in predisposed individuals.

    ●Cardiovascular Strain: Potential negative impacts on lipid profile (lowering HDL, raising LDL cholesterol) and blood pressure are expected, similar to other oral steroids.

    ●Tendon Injury Risk: A paradoxical and dangerous risk. While muscles may grow and strengthen rapidly, tendons and ligaments may not adapt at the same pace, increasing the risk of rupture or severe strain.

    ●"Unknown Unknowns": The long-term consequences of pharmacological myostatin inhibition in humans are entirely uncharted. Potential impacts on cardiac muscle (which also expresses myostatin) and other systemic functions are a major concern.

    All dosage information is extrapolated from non-human research and uncontrolled user reports. There is no safe or established human dose.

    ●Theoretical Dosage Range: Anecdotal protocols typically suggest 5mg to 15mg per day, split into two administrations due to its relatively short half-life. A common starting point in research communities is 10mg daily (e.g., 5mg twice per day). Doses exceeding 15-20mg daily are reported to drastically increase side effects with diminishing returns.

    ●Half-Life: The exact half-life in humans is unknown. Based on its structure and anecdotal reports, the half-life is estimated to be between 4 to 8 hours. This necessitates multiple daily doses to maintain stable blood levels and consistent myostatin inhibition.

    ●Administration: YK-11 is typically found as a raw powder or in oral suspensions/capsules. It is very poorly bioavailable when taken orally in its raw form due to significant first-pass liver metabolism. Most users seek sublingual administration (holding a solution under the tongue) or use it in a transdermal formulation to improve bioavailability, though data on efficacy is purely anecdotal.

    Due to its steroidal and suppressive nature, a robust PCT is non-negotiable to restore endogenous testosterone production. Simply waiting for recovery is insufficient and can lead to prolonged hypogonadism and loss of all gains.

    ●PCT Timing: Begin after the compound has cleared the system, typically 3-5 days after the last dose due to its short half-life.

    ●PCT Protocol: A standard PCT would involve a SERM (Selective Estrogen Receptor Modulator) protocol over 4-6 weeks. A common example:

    ○Weeks 1-4: Nolvadex (Tamoxifen Citrate) at 20mg daily OR Clomid (Clomiphene Citrate) at 50mg daily.

    ○Optional Extension/Stronger Protocol: Weeks 1-2 at a higher dose (e.g., Nolvadex 40mg, Clomid 100mg), followed by weeks 3-6 at a lower dose.

    ●Support During PCT: Continue liver support. The use of a natural testosterone booster (containing ingredients like D-Aspartic Acid, Ashwagandha) may provide ancillary benefit, but cannot replace SERMs. Blood work (testosterone, LH, FSH, lipids, liver enzymes) before, during, and after the cycle is the only responsible way to gauge recovery.

Brand	STROMUSC
Trade names	YK11; (17α,20E)-17,20-diene-21-carboxylic acid methyl ester
CAS	1370003-76-1
Molar mass	430.541
Formula	C25H34O6
Purity	Above 98%
Apprarance	10mg*100

 

 

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    YK-11 represents a fascinating but perilous frontier in experimental bodybuilding pharmacology. Its unique proposition as a myostatin-inhibiting, steroidal partial agonist offers a theoretical pathway to exceptional muscle growth. However, this comes shrouded in a profound lack of human safety data and a significant risk profile that mirrors or potentially exceeds traditional oral anabolic steroids. It is a compound that operates in the shadows of clinical research, its use dictated by anecdote and speculation. For the vast majority of individuals, the potential for serious, irreversible health consequences far outweighs any hypothetical benefit. Responsible exploration demands extreme caution, meticulous health monitoring, and an acknowledgment that one is essentially conducting an uncontrolled experiment on their own physiology.

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