No on the TMG BUT a big YES on folic acid (1200 mcg. and I should take more).
You state that he had "heartburn (on meds for that too) and the niacin and folate were making it worse." My guess is the 100 or more milligrams of Niacin was causing heartburn but NOT the 1 mg of folate....that's a pretty miniscule amount and couldn' upset a flea's digestion. Almost akin to saying that since Kool-Aid and cyanide caused the deaths at Jonestown, Kool Aid is dangerous (well it IS with all those food dyes, but only slightly so


!)
Have him give JUST the folic acid a try. You have to search for the 800 mg. supplements....hard to find.