I would just suggest sticking to the staples and eating. If you want to put on 25 pounds of quality mass, you're looking at 2-3 years IMO.
If you really want to run a supplement. Alphamax is a good option for a clean bulk. Assuming your diet, training, and recovery is in check, Alphamax will aid you in creating lean mass while not putting on much fat.
Alphamax contains a full 50mg of 95% Forskolin, a dose shown in clinical studies proven in humans to increase Lean Body Mass while decreasing Fat Mass. It contains a full 1.4 grams of Divanill, leading to lowered SHBG and increased Free Testosterone.
Contains 300mg 98% L-DOPA which will increase Total testosterone having synergistic effects with Divanill. And to round it out it contains a full 75mg Arimistane, this will keep estrogen under control while also controlling cortisol, leading to an increase anabolic environment.
The L-Dopa and ZMA will also lead to better sleep which can lead to better recovery. The Forskolin is worth the price of Alphamax alone if you look at just that one ingredient. The great thing about Alphamax is that it is an open label, no prop blends. You know what you're getting and at what dose.