“Test-P 100” is a black-market injectable anabolic-androgenic steroid (AAS) that contains 100 milligrams per milliliter (mg/ml) of testosterone propionate. As a black-market product, it is illegal for human use in many countries, unregulated, and carries significant health risks.
Active substance
- Testosterone propionate: This is a synthetic, fast-acting ester of the male hormone testosterone.
- Short half-life: Because of its short half-life of 1.5–2 days, it requires frequent injections, often every other day.
- Medical use: Medically, testosterone propionate was used for hormone replacement therapy but has largely been replaced by longer-acting esters.
Intended use by bodybuilders
Users illegally acquire Test-P 100 for its potent anabolic effects, particularly for cutting and lean bulking cycles. The perceived benefits include:
- Rapid muscle growth: The steroid is known for its ability to produce quick gains in muscle mass.
- Increased strength: Users often report significant increases in strength and power.
- Enhanced recovery: It is believed to help with faster recovery after intense workouts.
Significant health risks
Since Test-P 100 is an unregulated, black-market product, its use poses serious and unpredictable health dangers. Side effects can be severe and include:
- Cardiovascular issues: High blood pressure, high cholesterol, increased risk of heart attack, and stroke.
- Hormonal imbalance: Suppression of the body’s natural testosterone production, leading to infertility, testicular shrinkage, and gynecomastia (male breast development).
- Psychological effects: Severe mood swings, aggression (“roid rage”), paranoia, and depression.
- Androgenic effects: Severe acne, oily skin, and accelerated male-pattern hair loss in predisposed individuals.
- Virilization in women: Female users can experience irreversible masculine features, such as a deepened voice and clitoral enlargement.
- Contamination risk: The product’s unregulated nature means it could be contaminated with other substances or contain an incorrect dosage, further increasing health risks.





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