I used to take the old formula with no problems. Something about this one has me getting really sick. It took me a while to figure that it was this vitamin making me sick. After taking this tablet with food or after food, In about 15 minutes I start to feel severe pain around my chest, hardly able to breath. It happened at work and I almost called 911 and my husband, I was sure it was a heart attack. Good thing I waited and after about 1 hour I was OK. I waited a few weeks and tried it again, exact same thing happened. Now I am stuck with a huge bottle of vitamins I cannot use.