Testosterone Cypionate 300: Testosterone Cypionate 300 is a long acting oil-based injectable with considerable gain in muscle mass and strength during a cycle. The mass gained from using this drug is likely to be accompanied by a discernible level of water retention. The resulting loss of definition of course makes testosterone cypionate a poor choice for cutting or dieting phases. The excess level of estrogen brought about by this drug can also cause one to develop gynecomastia rather quickly. Proviron and/or Nolvadex should be added if soreness , swelling , or a lump under the nipples. Better still take it from the start of the course to prevent it starting. This will minimise the effect of estrogen qreatly, making the steroid more tolerable to use. Weekly or twice weekly injections should keep blood levels fairly constant. It is not necessary to inject testosterone cypionate any more frequently than that, although it isn't unheard of for individuals to do so. Dosage: At a dosage of 200mg-800mg per week we should see dramatic results. It is interesting to note that while a large number of other steroid compounds have been made available since testosterone injectables, they are still considered to be the dominant bulking agents amongst bodybuilders. When taking dosages above 800-1000mg per week there is little doubt that water retention will be the primary gain. It far outweighs the new mass accumulation. Therefor the practice of mega-dosing is inefficient. Especially when we take into account the cost of steroids today. It is also important to remember that the use of an injectable testosterone will quickly suppress endrogenous testosterone production. Therefore, it may be good advice to use a testosterone stimulating drug like HCG and/or Clomid/Nolvadex. This should help the user avoid a strong crash due to the hormonal imbalance, which can strip away much of the new muscle mass and strength.