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12 Types of Birth Control
What it's called: Implanon, Norplant
What it does: About the size of a matchstick, the implant is placed under the skin on your upper arm. Implants last for three years and can cost up to $800. They are nearly 100% effective.
Who should avoid it: Implanon may not work as well for women taking St. John's wort, or women who are overweight.
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