HP-Cypo Testosterone 250mg 10ml is an injectable form of testosterone cypionate, an anabolic and androgenic steroid. It is an oil-based testosterone, which has a slow release rate and can be used to boost testosterone levels. It is often used by bodybuilders and athletes looking to boost their testosterone and enhance their performance. Its effects include increased muscle size, strength and endurance and improved libido. Common side effects include acne, hair loss, depression, liver problems and gynecomastia.