L-Theanine has a noticeable effect when I drink my morning coffee, it totally eliminates the jittery effects and smooths it out.
I've tried a lot of CBD products and some work VERY well (Feals, Soul) and some might as well be gummy bears (Cornbread Hemp). I generally disbelieve "internet" PR claims as well, but the two I mentioned are legit.
I'll eat 3 Feals gummies or 1 Soul "Out of Office" quad, and it rocks me. (M, 40's, 6', 170lbs).