stackers

I use stacker 3's everyday now for about 2 yrs. I only take one in the morning around 6am then usually 1 around 3pm. I have mitral valve prolapse and a heart murmur, they do not usually bother me. I have noticed when i take 2 at a time on an empty stomach, it can make my heart race. I weigh about 108 lbs size 3. i do not take any heart medications, but I would suggest asking your general doctor if this product is ok for you especially if you are on any medications.