From Bill Hall's resume:

"Feb 95 - Sep 01: Nikken Independent Distributor"

Re Nikken (self-description, not a joke, just a sample):

"Nikken PiMag™ Optimizer II
The Nikken PiMag Optimizer II is specifically designed to produce
water your body needs. The Optimizer features a pi ring of special
coral that comes from the deep ocean. This ring contains calcium
carbonate, a mineral used in Japan as a natural way to modify water's
acid/alkaline balance. Powerful rotating magnets produce a complex
magnetic field, and the vortex action adds oxygen. In minutes, you
have optimized water for drinking, cooking, any use. Those who try it
report that it tastes "lighter" and more refreshing than ordinary
water. Find out how good your drinking water can be!"

Nikken uses the classical pyramid scheme to sell fraudulent products.
No - they don't seem to sell Natrol.