Prohormones are a similar drug to steroids and SARMs: they boost the body’s ability to produce muscle, you gain strength and endurance, and several other minor improvements. Some people have taken to stacking SARMs and prohormones together, but that’s a bad idea.
Similar to steroids, testosterone suppression from taking such two unbelievably powerful drugs back to back will be nearly unavoidable without PCT. Prohormones may be able to boost your growth rate a little further, but it likely isn’t worth it with the chance of having testosterone suppression and other side-effects popping up not long after your cycle ends.
This is another case where the costs likely outweigh the benefits. It’s probably safer — though maybe slightly harder — to get ripped without stacking SARMs with prohormones.