Once the body adjusts to the levels, the
flushing stops. Since that one time, no more
flushing--not even with the second dose. Best advice i can give you about the flushing--don't take your morning pill with coffee or any drink that has caffeine, which can open up your capillaries causing you to flush more. I also avoid taking my b complex vitamin (b3=niacin) at the same time. I take it a few hours later.
I HAVE HAD NO GI PROBLEMS!!!!