Testosterone Blend 400mg (T400): Overview
Testosterone Blend 400mg — often referred to as T400 — is a high-potency injectable blend of multiple testosterone esters, typically containing 400mg of testosterone per milliliter (mL). It’s designed to provide both fast and long-acting testosterone effects, making it popular for bodybuilders, athletes, and in some limited hormone replacement contexts.
🧪 Common T400 Blend Composition
While the exact ratio may vary by manufacturer, a typical T400 blend includes:
| Ester | Dosage (per 1 mL) | Role |
|---|---|---|
| Testosterone Propionate | 50–75 mg | Fast-acting, quick release |
| Testosterone Phenylpropionate | 75 mg | Intermediate-acting |
| Testosterone Cypionate | 125–150 mg | Long-acting |
| Testosterone Enanthate | 100–125 mg | Long-acting |
| Total | 400 mg/mL |
Some blends also include Testosterone Decanoate or Isocaproate.
🔬 Key Features
| Feature | Description |
|---|---|
| Concentration | 400 mg/mL (very high) |
| Form | Injectable (IM) |
| Half-life range | 1–10+ days (depends on esters) |
| Injection frequency | 2× per week (minimum), often more |
| Estrogenic activity | High — aromatizes easily |
💪 Benefits & Use Cases
| Use Case | Why It’s Used |
|---|---|
| Bulking cycles | Potent for muscle gain |
| Long-term testosterone support | Extended blood level stability |
| Kickstart + maintain | Fast esters give quick results, long esters maintain them |
| Fewer injections | Higher mg/mL reduces injection volume |
📆 Typical Bodybuilding Dosage (Not Medical Advice)
| Level | Weekly Dose | Injection Frequency |
|---|---|---|
| Beginner | 400 mg | 1–2× per week |
| Intermediate | 600–800 mg | 2× per week |
| Advanced | 1000+ mg | 2–3× per week |
Note: Because of the high concentration, post-injection pain (PIP) is common — some users dilute it with sterile oil or another compound like Deca or EQ.
⚠️ Side Effects & Risks
🔴 Estrogenic (due to aromatization):
-
Gynecomastia
-
Water retention
-
High blood pressure
🟠 Androgenic:
-
Acne, hair loss, oily skin
🔵 Cardiovascular:
-
Lower HDL, raise LDL
-
Blood pressure increase
⚫ Suppression of Natural Testosterone:
-
Requires PCT or continuous use
⚠️ Injection Issues:
-
Post-injection pain (PIP) due to high concentration
-
Risk of abscess if injected improperly
🔄 Post Cycle Therapy (PCT)
A strong cycle like T400 requires a solid PCT:
| Compound | Duration | Notes |
|---|---|---|
| Clomid | 4 weeks | Start ~2 weeks after last dose |
| Nolvadex | 4 weeks | May stack with Clomid |
| hCG | 2–3 weeks pre-PCT | Stimulate natural testicular function |
📊 Comparison: T400 vs Other Testosterone Esters
| Feature | T400 Blend | Enanthate | Propionate |
|---|---|---|---|
| Half-life coverage | Wide range (1–10 days) | ~7–10 days | ~2–3 days |
| Injection frequency | 2×/week | 1–2×/week | EOD/Daily |
| Onset of action | Fast + sustained | Slow | Fast |
| Post-injection pain | ⚠️ High | Low | Moderate |
| Concentration | High (400mg/mL) | Standard (200–250mg) | Lower (100mg/mL) |
🧾 Summary: Testosterone Blend 400mg (T400)
| Trait | Detail |
|---|---|
| Strength | 400mg/mL |
| Injection Frequency | At least 2×/week |
| Use | Bulking, long cycles |
| Pros | Strong effects, fewer injections |
| Cons | Post-injection pain, estrogenic side effects |
| PCT Required? | ✅ Yes |
⚠️ Final Caution
T400 is a powerful compound, often underdosed or contaminated if bought underground. Its potency increases risks of hormonal imbalance, cardiovascular stress, and severe side effects if used without proper medical oversight.
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