I ended up down this exact rabbit hole when my shoulder recovery was dragging on forever after an injury. The biggest turning point for me was realizing that secretagogues and direct compounds hit the system from completely different angles. One option acts as a direct substitute to jumpstart cell reproduction and metabolism, while the other basically signals your pituitary gland to increase its own output naturally. Understanding that basic divide helped me stop wasting money on random products that were completely wrong for my goals. A lot of guys rush into things without checking their baseline blood work, but learning the baseline mechanics first saves you so much stress. Whenever people ask me where to read up on how these different functional groups are laid out, I usually just point them to because it helped me break down the direct stuff versus the natural triggers pretty clearly. Take it slow, make sure your sleep and nutrition are locked in first, and don't rush into anything without knowing how your body reacts.