Wow..this has also confused me! My GI prescribed folic acid along with the mesalamine too. My med records stated it's a "trial". Not really sure if it needed, but would love to NOT take it as it stains the toliet seats purple!
Oh how embarrasing when you go visit people overnight! I have to ask them to have some clorox wipes near the toilet so I can wipe the underside of the seat!