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It also helps make neurotransmitters , which send signals between nerves

Iron deficiency leads to anemia, causing fatigue and a general lack of energy

Sources Body weight and composition in users of levonorgestrel-releasing intrauterine system, Contraception [accessed 17 July 2025] Depo-medroxyprogesterone acetate, weight gain and amenorrhea among obese women adolescent and adult women, The European Journal of Contraception & Reproductive Health Care [accessed 17 July 2025] Effect of birth control pills and patches on weight, Cochrane [accessed 17 July 2025] Effect of the ethinylestradiol/norelgestromin contraceptive patch on body composition

At the molecular level, their mechanisms complement each other