Selenium Se Atomic Number: 34 Atomic Weight: 78.96 _______________________________________________________________________________ Human Physiology: - Component of glutathione peroxides that protects against free radicals Prevalence: - 12-20.3 mg present in the body - Soil and water Sources: - Brewer's yeast, wheat germ, butter, garlic, grains, sunflowers, organic meats, shellfish Deficiency: - Decreased thyroid function - Kershan disease-chronic deficiency that results in heart disease Excess: - Numbness, tingling in fingers, toes - White spots on nails - Hair loss - Dizziness, fatigue