This reminds me of Circuit Assembly part where a brother had a reputation in the congregation for pushing people to get involved in the latest networking fad. This time, he was selling a product that would improve your 'toxa-tonin' levels. There is a Brother Toxa-tonin in my congregation that usually gets involved in a new company at the end of the school year to supplement his income.
While the point of the talk was NOT to avoid MLM businesses, (the cell company Sprint was a MLM at one time), it was to not get into thinking of using the Brotherhood as your secret to financial success.
For you Brother, continue to reason with your wife as to if this supplement is budget-worthy enough. If she has a bunch of scrapbooking materials from 2007 that still hasn't materialized into anything memorable (other than how much it cost to purchase that special die-cut (sorry, getting into personal past experiences:glare:)).... Maybe you should go to a vitamin shop or a natural food store for cheaper alternatives. I've used supplements and many don't have the same side-effects (if any at all) compared to the medical equivalent. Take care!