The thyroid gland affects almost all tissues in the body because it regulates cell metabolism – the ability to break down the food and transform it into energy. When the thyroid gland does not work properly, the consequences can be very serious. One of these adverse effects is hyperthyroidism, which may cause weight loss, anxiety or nervousness, increased sweating, tremor, diarrhea, palpitations, muscle weakness and heat intolerance. Hypothyroidism, another thyroid disorder, can cause fatigue, weight gain, depression, drowsiness, dry skin, cold intolerance, voice change, change in menstrual periods and muscle cramps. Thyreogen is recommended for all over 40, especially women around menopause and people with thyroid disturbances or iodine deficiency.