Tren Test Mast Long 300 is an illegal, black-market injectable anabolic-androgenic steroid (AAS) blend. It is not a medically approved drug and is produced in unregulated laboratories for performance enhancement and bodybuilding.
The name indicates a high-potency mixture of three different long-acting steroids at a concentration of 300 milligrams per milliliter (mg/ml):
- Trenbolone (Tren): A powerful synthetic steroid, typically trenbolone enanthate in a “long” blend. It is known for promoting rapid muscle growth and fat loss.
- Testosterone (Test): The blend contains a long-acting testosterone ester, such as testosterone enanthate or cypionate. Testosterone supports muscle growth, strength, and recovery.
- Drostanolone (Mast): More commonly known as Masteron, this is an androgenic steroid that enhances muscle hardness and definition. In a “long” blend, it would be drostanolone enanthate.
Legal status and dangers
- Illegal and unregulated: Because it is composed of controlled substances, possessing and using “Tren Test Mast Long 300” without a valid prescription is illegal in many countries. As a black-market product, its purity, dosage, and sterility are not guaranteed.
- Banned in sports: All the steroid ingredients in this blend are on the World Anti-Doping Agency (WADA) list of prohibited substances and are banned by major sports organizations.
Severe health risks
The combination of these three potent steroids at a high concentration can lead to severe and potentially life-threatening side effects.
- Cardiovascular damage: Significant risk of high blood pressure, elevated cholesterol levels, heart attack, and stroke.
- Hormonal dysfunction: Severe suppression of the body’s natural testosterone production, which can cause testicular shrinkage, infertility, and gynecomastia (male breast development).
- Psychological effects: Extreme mood swings, increased aggression (“roid rage”), paranoia, anxiety, and insomnia (“trensomnia”).
- Androgenic effects: Severe acne, oily skin, and accelerated male-pattern hair loss.
- Liver and kidney damage: Potential for severe, long-term harm to the liver and kidneys.
- Injection site issues: Risk of infection due to non-sterile manufacturing.
- Irreversible effects for women: Virilization, or the development of masculine features, such as a deepened voice and clitoral enlargement





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