"as a 33 year old, well conditioned athlete, i had missed periods for over 6 months.  my body fat percentage is extremely low and probably the cause of amenorrhea.  i am on the last &quot;active&quot; pill now of generess fe and have changed no other factors in my life since starting this medication (paleo diet, crossfit &amp; running).  i have gained 15 pounds in the last 23 days and have never felt more uncomfortable in my own skin. i have taken birth control in the past and never had such an awful experience with side effects."