"Our calcium and magnesium citrate are free of rice and corn. The facility that the product is bottled in maybe not be free of rice and corn. If you have any other questions please give me sent me an email."
"Cross contamination of minute amounts of materials is a possibility if the facility processing other ingredients with corn or rice to them. The Vitamin B complex, zinc and l-glutamine do not have any corn in them. The ascorbic acid... maybe corn derived."
"Theoretically there is no corn in the ascorbic acid as the source is material is corn but the finished material is a semi synthetic. But we can not say that extremely sensitive people are not going to react."
If you do see ascorbic acid in the ingredients, these products will be corny and should be avoided. There is a chance for cross-contamination with other items, but may or may not be enough to cause problems.
Informed choices are best!