The estrogen level: In the '60s when birth control pills first came out the estrogen level was 80 micrograms of estrogen - they made women nauseated and throw up. Then came the 50 mcg dosing which was standard until the "low dose" pills came out containing either 35 or 30 mcg. The lowest dose pill on the market is a 20 mcg. The difference really between lower and higher doses is how much it suppresses ovulation.
Answered 7/5/2013
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