Definition of supernal. 1  1a : being or coming from on highb : heavenly, ethereal supernal melodiesc : superlatively good supernal trumpet playing. 2  2 : located in or belonging to the sky.
Organic Foods. Organic eggs, oranges, grapefruit, lemons, vegetable juices, beef liver and kidney and sprouts derived from organic seeds are believed to increase thyroid activity, according to The Natural Health Place, a healthy living website.
Zinc. In addition to selenium, zinc plays a role in the conversion of the thyroid hormone T4 to T3. Metzak says selenium and zinc are beneficial in improving thyroid function and hormone levels. Food sources of zinc include shellfish, mollusks, meat, legumes, and nuts.