STROMUSC Andarine S4 For Bodybuilding CAS:401900-40-1
S4-Andarine (AC-262536) is a selective androgen receptor modulator (SARM) that has garnered attention in bodybuilding for its ability to enhance muscle growth, fat loss, and physical performance without the severe side effects of traditional anabolic steroids. This guide explores its unique characteristics, applications, dosing protocols, and safety considerations, offering novel insights distinct from existing content.
What is S4-Andarine?
Developed in the early 2000s by GTx Inc., S4 was initially researched for treating muscle wasting, osteoporosis, and benign prostatic hyperplasia. Unlike steroids, SARMs like S4 selectively bind to androgen receptors in muscle and bone, sparing organs like the liver and prostate. This selectivity reduces risks such as hepatotoxicity and androgenic side effects (e.g., hair loss, acne).
Chemical Profile:
●Non-steroidal structure with a phenyl-oxadiazole backbone.
●Partial agonist activity at androgen receptors, promoting anabolism while minimizing unwanted activation in non-target tissues.
Key Features of S4
1.Tissue Selectivity:
●Preferential activation of muscle and bone receptors, unlike steroids that affect all androgen-sensitive tissues.
●Minimal impact on the hypothalamus-pituitary-gonadal (HPG) axis compared to steroids, though suppression can occur at high doses.
2.Dual Anabolic/Catabolic Effects:
●Stimulates muscle protein synthesis while enhancing fat oxidation via increased metabolic rate.
3.Vision-Related Side Effects:
●Unique to S4, users report transient visual disturbances (e.g., night blindness, yellow tint) due to interaction with retinal androgen receptors. These resolve post-cycle.
Applications in Bodybuilding
1.Cutting Cycles:
●Preserves lean mass in caloric deficits. Studies suggest S4 increases fat-free mass by 1–3 lbs over 8 weeks while reducing fat by 2–4%.
2.Recomping:
●Simultaneous muscle gain and fat loss. Ideal for intermediate athletes seeking a "shredded" physique.
3.Injury Rehabilitation:
●Accelerates recovery of tendon and bone injuries via localized androgen receptor activation.
4.Strength Enhancement:
●Boosts power output by 8–12% through improved neuromuscular efficiency.
Benefits Over Traditional Steroids
●Lower Androgenic Activity: No virilization in women at moderate doses (e.g., voice deepening).
●Oral Bioavailability: No injection required; stable half-life supports twice-daily dosing.
●Faster Clearance: Reduced detection time (3–5 days) vs. steroids (weeks to months).
Dosage & Administration
●Men: 25–75 mg/day, split into AM/PM doses. Start at 25 mg to assess tolerance.
●Women: 10–25 mg/day due to higher sensitivity.
Dosing Strategy:
●Weeks 1–2: 25 mg/day.
●Weeks 3–8: 50 mg/day (split into 25 mg x2).
●Weeks 9–12: Optional taper to 25 mg/day to mitigate suppression.
Note: Doses >50 mg/day increase the likelihood of vision issues.
Cycle Length & Stacking
●Solo Cycles: 8–12 weeks. Longer cycles risk mild testosterone suppression (10–30% decrease).
●Stacking:
○With Ostarine (MK-2866): Enhances muscle preservation (ideal for cuts).
○With Cardarine (GW-501516): Amplifies fat loss and endurance.
Post-Cycle Therapy (PCT):
●Mild Cycles (≤50 mg/day for 8 weeks): Often unnecessary.
●Aggressive Cycles (>50 mg/day or 12+ weeks): Use SERMs like Tamoxifen (10–20 mg/day for 4 weeks) to restore natural testosterone.
Half-Life & Timing
●Half-Life: 4–6 hours, necessitating split dosing.
●Peak Plasma Concentration: 1–2 hours post-ingestion.
●Optimal Timing:
○Morning dose: Pre-workout for energy.
○Evening dose: Avoid late-night administration to reduce overnight vision disturbances.
Safety & Side Effects
1.Common:
●Vision changes (dose-dependent, reversible).
●Mild testosterone suppression (resolves post-cycle).
2.Rare:
●Headaches, lethargy (manageable with hydration and electrolyte balance).
3.Contraindications:
●Pre-existing eye conditions (e.g., glaucoma).
●Pregnancy (androgen exposure risks fetal development).
Mechanism of Action: A Deeper Dive
S4's partial agonism triggers muscle hypertrophy via:
1.mTOR Activation: Stimulates ribosomal biogenesis for protein synthesis.
2.IGF-1 Upregulation: Enhances satellite cell proliferation.
3.Adipocyte Inhibition: Blocks PPARγ, reducing fat storage.
Unlike steroids, S4 avoids prostate enlargement by bypassing 5α-reductase conversion to DHT.
User Experience & Anecdotal Insights
●Day 1–14: Increased vascularity and pumps.
●Week 3–4: Noticeable fat loss, especially in stubborn areas (lower abs, obliques).
●Week 6–8: Strength plateaus; users recommend cyclic carb-loading to replenish glycogen.
Pro Tip: Pair S4 with omega-3s to mitigate dry eyes from vision side effects.
Legal Status & Availability
●Research Use Only: Not FDA-approved for humans.
●Global Regulations: Banned in competitive sports (WADA), legal in most countries for personal use.
Novel Insights & Future Potential
Recent rodent studies suggest S4 may protect against dexamethasone-induced muscle atrophy, hinting at therapeutic applications for corticosteroid users. However, human trials are lacking, emphasizing the need for caution.
Clinical Data
|
Brand |
STROMUSC |
|
Trade names |
Acetamidoxolutamide; Androxolutamide; GTx-007; S-4 |
|
CAS |
401900-40-1 |
|
Molar mass |
441.363 |
|
Formula |
C19H18F3N3O6 |
|
Purity |
Above 98% |
|
Apprarance |
25mg*100 |
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Conclusion
S4-Andarine offers a safer alternative to steroids for targeted muscle growth and fat loss. Its unique profile-marked by partial agonism and transient side effects-makes it ideal for athletes prioritizing lean gains with minimal risk. Always consult a healthcare provider before use and prioritize bloodwork to monitor hormonal health.
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