No effect from Cistanch good or bad

An earlier thread suggested some mental benefit is possible with Cistanche Tuberosa. I bought a powder pure version from Amazon claiming to be 20:1.concentrated extract and full spectrum.

I had hoped to find something at least approaching Methyl phenidate or at least caffeine, mentally. I felt nothing though, either good or bad. I used 1 scoop estimated to be 2950 mg, and mixed it with water.

What did I do wrong? I'm starting to think nothing would be legal to sell if it actually did anything.