Is there a scientific/chemical explanation as to why Saint Johns Wort is said to interfere with birt

I know that there is anecdotal evidence that SJW can decrease the effectiveness of oral contraceptives, but is there any solid evidence or proof that it is actually the culprit in these incidences rather than there being another possible cause? If so, what is the chemical action that causes the interference? Also, is anyone aware of how greatly the oral contraceptive effect is decreased? Please HELP, because I want to try taking SJW as I can't afford anymore prescription antidepressants, but I can also not afford to get pregnant. Do I really need to worry or is the connection unproven? Thank you...

I think Saint John's wort is very weak and really does nothing for depression or anxiety. Its a natural herb that is just to weak to combat mod to heavy mental problems. Some of that natural stuff is a scam.

http://www.blackwell-synergy.com/links/d...

walmart and target have generic antidepressants for 4 dollars a month, which i guarantee is less than sjw.

and a hell of a lot cheaper than your b.c.

chemical action that causes the interference? the way your liver metabolises sjw causes a reduction of estrogen, the main component of bc..