Boldenone undecylenate is a very versatile drug, and can be combined with a number of other agents depending on the desired result. For mass, it is commonly stacked with an injectable testosterone such as enanthate or cypionate. This should produce strong gains in muscle size and strength, without the same intensity of side effects of using testosterone (at a higher dose) alone. During a cutting phase, muscle hardness and density can be greatly improved when combining boldenone undecylenate with a non-aromatizable steroid such as trenbolone acetate or methenolone enanthate. Oral c-17 alpha alkylated agents such as fluoxymesterone or stanozolol may also be used, but will present some level of hepatotoxicity. For some, even the low buildup of estrogen associated with this compound is enough to relegate its use to bulking cycles only.
This is just interesting and I figured to mention it because many have no doubt heard of this. If you have not, now you have the full explanation without hearing the first part without the explanation and having to wonder why. These two drugs do not convert back and forth in the body, the above example is simply illustrative of why you may have heard or read before that these two drugs are similar. Only in structure. In action they are very different (as many of you who have used each of these drugs, no doubt knows). But now you know structure-wise. And if you have heard this before, now you know exactly why they are structurally similar.