The requirement for vitamin D supplementation needs to be individualized. Thorne Research’s D-1000 is ideal for maintaining optimum vitamin D levels in many healthy individuals.It is essential to maintain healthy vitamin D levels throughout all stages of life, from fetal development to old age.  Vitamin D helps protect a number of important functions in the body.  The current recommended daily vitamin D intake of 400 IUs is based on the minimum allowance to protect against bone disease. However, an upward revision of the FDA's guideline is now under consideration in light of new research, especially pertaining to immune function. Cutting-edge research suggests serum vitamin D levels should be in the range of 32-80 ng/mL 25-hydroxyvitamin D (25(OH)D). Although direct sunlight exposure is a good source of vitamin D, many people do not get enough sun due to season change, latitude, or lifestyle. Therefore, vitamin D supplementation can be of great benefit in these cases.Thorne Research's D-1,000 supplies 1,000 IU of vitamin D3 in each vegetarian capsule. This potency is ideal for maintaining optimum vitamin D levels in healthy individuals.Features:Containing 1,000 IU of vitamin D3 per capsuleThorne Research's vitamin D contains no unnecessary ingredients – like lactose, BHT, BHA, sodium benzoate, and sorbic acid – that can be detrimental to sensitive individualssupports cardiovascular, immune, and bone healthMedicinal Ingredients: Per Capsule: Vitamin D3 (Cholecalciferol) 25 mcgNon-Medicinal Ingredients:Hypromellose (derived from cellulose) capsule, L-Leucine, Silicon Dioxide, Cellulose, Vitamin E.Recommended Dose (Adults):Take 1 capsule daily or as recommended by a health-care practitioner. Children/Adolescents (4-18 years): Take 1 capsule daily or as recommended by a health-care practitioner.Warnings:Keep out of reach of children. Do not use if security seal inside the cap is broken. Store tightly sealed in a cool, dry place.  This product is contraindicated in an individual with a history of hypersensitivity to any of its ingredients.  If pregnant, consult your health-care practitioner before using this product.  There are no known adverse interactions or contraindications at publication date.