I found this article while researching ways to balance your hormones naturally. I think it applies to Mirena users.
: What are the most common nutrient deficiencies caused by taking birth control pills?
-Norah W., West Palm Beach, Fla.
A: Addressing nutrient deficiency caused by birth control pills is especially important if you have been taking the Pill for more than seven years-drug-induced nutrient deficiency worsens over time. Studies have consistently shown that B vitamins are the most commonly depleted nutrients with birth control use. The B vitamins are critical to nerve health, and women taking any form of birth control should simultaneously take a high-potency B-complex vitamin (with at least 50 mg of B6, 1,000 meg of B12, and 800 meg of folate). Folic acid, a B relative, is important for nerves and brain, and is also necessary for cell repair and development. Cells that turn over rapidly, such as those in the mouth and gut, quickly become ulcerated when folate stores plummet.
Another commonly depleted nutrient among women on birth control is magnesium; marginal deficiency is common in the general population already. Deficiency symptoms include muscle cramps, weakness, insomnia, kidney stones, bone loss, depression, nervousness, anxiety, and high blood pressure. Take 500 mg at bedtime in a liquid or powdered form for easy absorption. Zinc is another essential mineral depleted by oral contraceptives and is important for wound healing; supplement with 20 to 50 mg daily.
A great resource is Drug-Induced Nutrient Depletion Handbook by Ross Pelton, James B. LaValle, Ernest B. Hawkins, and Daniel Krinsky; consult this reference for any drug you take. I would also caution that most oral contraceptives deplete the amino acid tyrosine, which, among other functions, helps maintain healthy thyroid function and is important for making some neurotransmitters. Low tyrosine can also contribute to depression. This depletion is one of the reasons birth control is often associated with weight gain and moodiness. The highest food source of tyrosine is cottage cheese: 1 cup provides 1.5 g. Or you can take a supplement (1.5 g daily), particularly during the second half of your menstrual cycle.