L-精氨酸 + L-瓜氨酸（粉末）

The scoop dissolves pretty cleanly in plain water, which I wasn't expecting from a powder, and the pump during my workout felt noticeably fuller by the end of the first week. Mixing it into my morning juice is now a habit I actually look forward to.

Used it about ten days straight mixed into my pre-workout shake and the pump is noticeably fuller by the time I hit the third set. The powder dissolves clean enough in cold water with a quick stir, no clumps sitting at the bottom.

I was skeptical about another powder, but one scoop in my pre-workout really delivers, and it dissolves clear enough that I don't taste much beyond my juice. That mixability alone keeps me coming back.