I am learning some things from Matt's pdf, but I'm not going to take his information for gospel. There is only 50mg of zinc in the Rising brand not 220mg as advertised. I'm able to handle 100-150mg some days of the chelated zinc here.
Definitely calcium carbonate is out for me unless someone has good evidence that it kills worms somehow. Otherwise it's just a strong irritant imo. I took a brand of coral calcium that had calcium carbonate in it and had a bad reaction to it.
I know about ramping, thanks. Still trying to get down to why sulfate only and not chelates. Sometimes higher doses of the zinc chelate I take gives me nausea so it could be a die-off.
Some compounding pharmacies might be willing to make ZnSO4.