Here is a good link from the official SCD website to help you know which supplement ingredients are legal or illegal.
This is also a great resource from pecanbread.com.
Here's a good chart regarding the Freeda vitamins.
I personally currently take take 3 Freeda SCD Multivitamins per day. I also take Vitamin D from Trader Joe's, and magnesium and fish oil from GI Pro Health which has a line of SCD vitamins.