I have some Symbiotics Colostrum on hand. ls it ok to use that, or will GI Restore work better? I also have some Immunocol - undenatured whey - natural source of the Glutathione precursor Cysteine on hand. Is it a good product for Glutathione?

It’s fine to take colostrum and immunocol you have on hand, but I wouldn't substitute a whey product for glutathione. When you run out, get a good liposomal glutathione.