I did some digging after posting yesterday. Turns out the SBI Protect has a bunch of clinical research behind it. I started to call the company to ask about
the differences between the two products but noticed a statement on their website that they will not answer questions from patients. Probably due to legal issues.
Anyway, I am going to see if I can exchange the IgG Protect for the SBI Protect.
Here’s the company information sheet on SBI Protect:
https://www.orthomolecularproducts.com/file.aspx?documentid=2250