At National supplement center.com They sell Copper Chlorophyllin with zinc. It explains why you need zinc with it. I've been wanting to order it and give it a try but I just haven't got around to it. I've started taking the charcoal, no change so far. I'm still trying to figure out when to take what. I remember reading somewhere that you shouldn't take chlorophyllin and charcoal at the same time but I can't find where I read the info. Mp's son is taking it and doing well so maybe it doesn't matter. If I find it I'll post. God bless