There are no cases of medical side effects I am aware of from the thousands that have used it. This is all natural homeotheraputic, only side effect is weight loss when properly followed.
Now the ACTUAL HCG diet (not My Slim Fix) which is actual HCG injection have been known for some side effects but that's because of it being actual hormone. We have no hormone HCG in My Slim Fix.
If not done already please read under downloads tab Dr.Simmeons "Pounds & Inches." this will give you more understanding of the program, just remember we are not HCG injections but homeotheraputic spray.