Testosterone Base Applications: Testosterone Suspension is an injectable testosterone hormone in a water base that was developed and used for decades, and is actually the first anabolic androgenic steroid made. For the purpose of building mass, Testosterone Suspension has never been surpassed since it was first developed in the 1930s. Many underground labs also suspend this product in propylene glycol or oil as well (which makes for a very painful injection). It has no ester attached; therefore no ester is calculated into the weight.