You still want to treat with the DMSA because if there is a metal piece in the body that shows up on X-ray, there will still be metal in the blood. Lead poisoning and zinc poisoning are very different. Lead moves much quicker and will kill much more quickly where zinc can sit in the body for weeks even months depending on the amount and not kill, lead will kill within hours. And the home test kits are basically worthless.
Danielle, PB is great for getting things out of the body because it's sticky enough to stick to things!
If you're feeding daily just because they like it, I'd suggest almond butter or another nut that is better for them, but when specifically trying to remove something like metal from the body, PB all the way and twice a day every day is fine.
April, I'm so glad that Nicky made it. Lead is very scary!