Thanks for these responses.

Now, I have a concern about folate/folic acid. For many years, I have been taking a reputable multiple vitamin with 1000 mcg of "Folate (= Folic Acid +Folacin)." After finding this site, I added in 800 mcg Folic Acid (Solgar brand). Is is dangerous for me to be taking folic acid in such high doses?