aperson, I can't really comment on those vitamins. I did notice they had magnesium stearate in them and magnesium can cause d.
Other then that can't really say anything about them.
I still say take an a-z vitamin.
On the slippery elm, I can't really comment either, someone else with more herbal knowledge might be able to help you. One thing is look at the source of the product and buy them from a reputable source.
did you read the article on posted on digestive enzyme's?