Stacking – Trenbolone only cycles are not recommended for a couple of reasons. While significant gains can be realized using trenbolone alone, the compound really shines when stacked with testosterone. It is particularly effective with Anadrol or Dianabol. Another reason trenbolone should be stacked with other compounds is because of estradiol issues. Not only does trenbolone not convert into estradiol (aromatise ), but at the same time, it suppresses the body’s natural production of testosterone, which is the source of estradiol in men. This means that a user may actually experience an unacceptable decrease in estrogen levels that can lead to problems with libido, joints and mood. Stacking trenbolone with another steroid that has a high estrogen conversion rate will prevent this situation. HCG and other compounds can be used during the cycle to prevent estrogen related issues.