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Estrogen in birth control could be cut way back, a study suggests

Timing could be key in reducing the level of the hormone in contraceptives

The level of estrogen in common hormonal birth control methods, including the pill, could be reduced by 92 percent, a mathematical model suggests.

JIM WATSON/AFP/Getty Images

By Natalia Mesa

- More than 2 years ago

Estrogen causes hormonal birth controls’ most serious and rare side effects, such as stroke and heart attack.