I recently added the MB&L with other supplements. After about a week, I did notice both headaches and stomach issues, so I stopped everything and added them back one-at-a-time to identify which was causing the problem. It seems to be the MB&L. Also, I saw so many comments about leaky packets, but hadn't seen any, so I checked the rest of my packets. Sure enough, of the 42 remaining pkts, 4 of them have leaking pills. My bad - I waited beyond the 30 days so I can't return them. Since I have them, I'm going to keep trying to see if they may help, if the head/stomach aches go away.