I met the guys from Boyd's at MACNA - really nice folks. In fact, I should say I met two of the Boyd's from Boyd's -- its a family owned/run business, and the guys at MACNA were not some glib account reps looking to sell whatever product gets the best margin. I got to hang with them a bit during the cruise (we shared chairs) and they really came accross differently than most product reps I've dealt with.
I've used Chemi-pure off and on for years, mostly "as needed".
I also use their vitamins.
(and this is an unpaid endorsement ! )