One thing everyone forgets about AI's....they arent prevention products at all.
AI's by themselves increase testosterone. They also reduce water weight and give a hard/dry appearance. Thats why they became so popular...as their use underground shows how versatile they are.
So, just from this you can see why an AI is so useful just by itself.
In a stack, you open an all new dimension. Take DAA for example. It increases testosterone by 40%. But what happens when testosterone increases?
Testosterone converts to estrogen via the aromatase enzyme. So you can take all your test boosters like DAA and increase your testosterone, but some of this newly increased testosterone will be converting to estrogen, unless you inhibit the enzyme with an AI. The result is an even higher testosterone peak
This is why the DAA and Erase stack is so popular...