Xeno Labs Supertest – 375mg/10ml
✓ High Concentration Power – Get 375mg of testosterone in just 1ml of oil
✓ Build 25-35 Pounds Fast – Serious mass gains with this powerful blend
✓ Four Testosterones Working Together – Fast kick-in plus weeks of sustained effects
✓ Less Volume To Inject – High concentration means smaller, easier injections
Original price was: $99.90.$84.90Current price is: $84.90.
In stock
Why You Should Buy Xeno Labs Supertest – 375mg/10ml at Steroiduck?
What It Does
Supertest 375 is a high-concentration testosterone blend at 375mg per ml. This is 50% stronger than regular testosterone products. Every ml contains four different testosterone esters working in perfect synergy:
- Testosterone Propionate 25mg – Works within 24-48 hours for immediate effects
- Testosterone Cypionate 100mg – Medium-long ester for steady release
- Testosterone Enanthate 125mg – Long-lasting, stable testosterone levels
- Testosterone Isocaproate 125mg – Bridges the gap between short and long esters
This smart combination means you get rapid results from the fast propionate while the long esters maintain elevated testosterone for weeks. Your blood levels stay stable instead of fluctuating up and down.
The Main Benefits For You
Massive Muscle Growth
With 375mg of testosterone per ml, you’re getting serious anabolic power. On your first cycle with Supertest 375, you can gain 25-35 pounds if you train intensely and eat in a surplus. Your muscles fill out rapidly, your frame expands, your body weight climbs every week.
Incredible Strength Increases
Within the first 2-3 weeks, you’ll be crushing PRs on all your major lifts. Your bench press jumps by 30-50 pounds. Your squat numbers climb dramatically. Your deadlift feels easier with heavier weight. The testosterone tells your nervous system and muscles to produce maximum force.
Convenient Smaller Injections
Because Supertest 375 is concentrated, you inject less total volume. Want 750mg per week? That’s only 2ml total instead of 3ml with regular 250mg testosterone. Smaller injections mean less soreness, easier site rotation, and more comfortable cycles overall.
Fast Acting, Long Lasting
The Propionate ester kicks in within 1-2 days. You don’t spend weeks waiting to feel the effects. Your libido increases immediately. Training feels easier right away. Energy levels spike fast. Meanwhile, the long esters keep working for 2-3 weeks after each injection for sustained gains.
Perfect Versatility
Supertest 375 works for any goal you have. Bulking to maximum size? Check. Lean bulking with quality gains? Check. Cutting while maintaining muscle? Check. Recomping to build and burn simultaneously? Check. It’s the ultimate versatile testosterone base.
Stable Hormone Levels
The multi-ester blend creates steady testosterone levels throughout your cycle. No dramatic peaks and crashes. Your mood stays stable. Your energy remains consistent. Your muscles get constant anabolic stimulation 24/7.
FDA DISCLAIMER: This product isn’t intended to diagnose, treat, cure, or prevent any disease. Testosterone blends are controlled substances and should only be used under proper medical supervision for legitimate medical purposes.
Recommended Dosage for Male:
375-750mg per week. Beginners start with 375-500mg weekly (1-1.33ml total). Intermediate users run 500-750mg weekly (1.33-2ml total). Advanced users sometimes go higher but this increases side effects significantly. Split into two injections per week - Monday and Thursday.
Recommended Dosage for Female:
NOT recommended. This is far too strong and will cause permanent masculine changes including deep voice, facial hair, and body changes that don't reverse.
When to Inject:
Inject deep into muscle (glutes, thighs, or shoulders) twice weekly for stable blood levels. Example: 1ml Monday morning, 1ml Thursday evening for 750mg weekly. Always rotate injection sites to avoid tissue damage and scar tissue buildup.
How to Inject:
Warm vial under hot water for 2-3 minutes before drawing (makes the oil flow easier). Use 1.5-inch needle for glutes, 1-inch for thighs/shoulders. Inject slowly over 30-45 seconds. Massage the area gently after injecting. Apply heat if soreness develops.
Cycle Duration:
12-16 weeks for optimal results. Don't run shorter than 12 weeks - the long esters need time to fully saturate and work. Most experienced users prefer 14-week cycles as the sweet spot.
Kickstart Strategy:
Many bodybuilders add oral steroids for weeks 1-6 while Supertest 375 reaches full saturation. Common choices: 30-50mg Dianabol daily, 40-60mg Turinabol daily, or 50mg Anadrol daily for explosive early gains.
Post Cycle Therapy (PCT):
Absolutely mandatory. Wait 3 weeks after your last injection (long esters must clear your system first). Then start PCT: Nolvadex 40/40/20/20mg daily + Clomid 50/50/25/25mg daily for 4 weeks to restart natural testosterone production.
Managing Estrogen:
Use Arimidex 0.5mg every other day starting from day 1. With testosterone at these doses, estrogen will climb rapidly. Have AI ready before starting - don't wait for symptoms like gyno or water bloat to appear.
Most Common:
- Complete shutdown of natural testosterone production during cycle
- Significant water retention - expect to look fuller but also hold water (common at moderate-high doses)
- Elevated blood pressure from water retention
- Acne on back, chest, face, and shoulders
- Very oily skin throughout the day
- High gyno risk without proper AI use - have Arimidex ready from day 1
- Testicular atrophy during cycle (normal, reverses after PCT)
- Accelerated hair loss if genetically predisposed to male pattern baldness
Serious Side Effects:
- Dangerously high blood pressure if estrogen and water not controlled
- Severe gynecomastia requiring surgery if AI not used properly
- Negative blood markers (cholesterol, hematocrit, liver stress)
- Mood changes - increased aggression, irritability, or anxiety
- Sleep disturbances from high testosterone or estrogen
- Enlarged prostate in older users
How to Manage:
Use Arimidex consistently throughout cycle. Get comprehensive blood work at weeks 6, 10, and post-PCT to monitor estrogen, cholesterol, blood pressure, liver, kidneys, and hematocrit. Donate blood if hematocrit exceeds 54%. Do cardio 3-4x weekly for cardiovascular health. Monitor blood pressure weekly at home. Plan complete PCT protocol before starting cycle.
Injection Site Considerations:
The 375mg/ml concentration can cause more post-injection pain (PIP) than lower concentrations like 250mg/ml. This is normal with highly concentrated oils. The pain typically decreases after the first 2-3 weeks as your tissue adapts. Massage thoroughly after injecting and use heating pad if needed.
Active Ingredients:
- Testosterone Propionate: 25mg per ml
- Testosterone Cypionate: 100mg per ml
- Testosterone Enanthate: 125mg per ml
- Testosterone Isocaproate: 125mg per ml
Total Dosage Strength:
375mg per 1 milliliter (total combined testosterone esters)
Actual testosterone base: ~260mg per ml (after ester weight removed)
Quantity:
10ml vial (3750mg total testosterone esters per vial)
Form:
Injectable oil-based solution in sterile multi-dose vial
Intended Use:
Primary medical use: Treating testosterone deficiency under medical supervision.
Primary bodybuilding use: Bulking cycles, maximum mass building, moderate-to-high dose testosterone protocols, strength development, versatile base for all cycles.
Half-Lives:
- Testosterone Propionate: 0.8 days (20 hours)
- Testosterone Cypionate: 8 days
- Testosterone Enanthate: 8-10 days
- Testosterone Isocaproate: 4 days
Bioavailability:
High (oil-based intramuscular injection provides excellent absorption)
Active Life:
Approximately 3 weeks due to long Enanthate and Cypionate esters
Detection Time:
Up to 3 months after last injection (important for drug-tested athletes)
Molecular Formula:
C19H28O2 (testosterone base with varying ester chains)
Anabolic/Androgenic Ratio:
100:100 (testosterone is the baseline standard all steroids are measured against)
Administration:
Deep intramuscular injection into glutes, thighs, or deltoids. Due to concentration, inject slowly over 30-45 seconds. Use 1-1.5 inch needle for proper depth depending on injection site.
Storage:
Store at room temperature (68-77°F or 20-25°C) away from direct light. Do not refrigerate. Do not freeze. Keep sealed until use. Keep out of reach of children.
Also Known As:
Supertest, Super Sustanon, High-Concentration Testosterone Blend, Multi-Ester Testosterone 375
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