Thyroid diseases affect a lot of people - it is estimated that hyperthyroidism occurs in up to 1.2% of the population, and hypothyroidism in 2%. What are the symptoms and how is the treatment for thyroid diseases such as hyperthyroidism, hypothyroidism, Hashimoto's disease or Graves' disease? Proper supplementation of selenium, zinc, iron, vitamin B1, ashwagandha, small-leaved bacopa or kelp (organic iodine) can support the proper functioning of the thyroid gland.