Zinc is a key mineral that helps produce thyroid-releasing hormones, or TRH, in your brain, which then signals your pituitary to make thyroid-stimulating hormone (TSH). In men, the failure to do this also results in low testosterone levels. According to several studies, low zinc levels are associated with low T3 (active thyroid hormone), and a reduced ability to convert T4 (see sidebar) to T3 [source: Richards]. Alcohol use can exacerbate this situation. If you're dealing with low thyroid symptoms and consume any amount of alcohol, consider taking supplemental zinc.
Furthermore, zinc is required at the intracellular level to help the thyroid nuclear receptors attach and drive the reading of the DNA genetic code. Remember, a primary function of thyroid hormone is to help put the genetic code into action, which underscores the importance of maintaining proper zinc levels [source: Shames].