http://www.hb-101usa.com/
It got good reviews on Amazon:
https://www.amazon.com/HB-101-All-Pu...NDU/ref=sr_1_2
So, I bought some.
But, then I realized that Superthrive, which I regard as snake oil, also got good reviews:
https://www.amazon.com/SUPERthrive-V...2J0/ref=sr_1_1
So, now, I feel depressed for being a sucker. Anyway, we'll see. I will report results of my
controlled experiments.