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The notable advantage of using Implanon for contraception is that it provides continuous protection for three years. Implanon is a long-acting reversible contraceptive that is inserted under the skin of the upper arm, where it slowly releases the hormone etonogestrel, a progestin, into the bloodstream. This steady release effectively prevents ovulation and thickens cervical mucus, making it highly effective at preventing pregnancy without requiring the user to remember to take a daily pill or attend frequent office visits for ongoing administration.

This extended duration of efficacy is particularly beneficial for individuals seeking a reliable contraceptive method without the need for daily compliance or regular administration, aligning well with lifestyle preferences of many users. It also helps to enhance adherence by removing the logistical challenges involved with methods that require more frequent action.

The other options, such as requiring daily medication or frequent office visits, do not apply to Implanon, making it a more convenient option compared to many other contraceptive methods. The option that mentions estrogen is also incorrect because Implanon does not release estrogen; it solely consists of a progestin, which is appropriate for individuals who may have contraindications to estrogen-based contraceptive methods.