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User:Triacylglyceride/sandbox

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USA IUD comparison
ParaGard
≤10 years. Copper toxic to sperm. Heavier menses.
Mirena
≤5 years. Progestin thickens cervical mucus, blocks sperm. Lighter or no menses.
Skyla
≤3 years. Progestin thickens cervical mucus, blocks sperm. Lighter or no menses.