D2 (type 2 iodothyronine deiodinase) is a medication used in HRT to trigger or deactivate thyroid hormones in individuals with thyroid disorders. This mechanism of action results in weight loss, gain or stabilization as needed, energy boost, mood improvement and the relieve of depression symptoms.
Vitamin D2, also known as ergocalciferol, helps the body use calcium and phosphorus to make strong bones and teeth. It is fat-soluble (can dissolve in fats and oils) and is found in plants and yeast. It can be made in the body from another form of vitamin D when the body is exposed to the sun. Vitamin D2 is also made in the laboratory to prevent and to treat vitamin D2 deficiency.