100mg is the minimum daily dosage. less than that can cause all manner of complications(not serious but unpleasant).
and the fact is, whether you like it or not, taking hormones for birth control is dangerous. period. so are IUDs. they should call them IUKDs - improvised uterine killing devices. look at how the mirena forum exploded here on curezone.
ignore nature and reap the whirlwind. obey nature and live. either choice is valid.