Vitamin D is synthesized in the body from sunlight. But, due to the winter season, weather conditions, and sunscreen blockers,
the body’s ability to produce optimal vitamin D levels may be inhibited.79 In fact, it has been proposed that annual fluctuations in
vitamin D levels explain the seasonality of influenza.80 All of these factors point to the value of taking a daily vitamin D supplement
to ensure optimal vitamin D intake.
Vitamin D has long provided significant support for healthy bone density.81-86 However, scientists have also validated the critical
role that vitamin D plays in regulating healthy cell division and differentiation, and its profound effects on human immunity.87-90
These findings link a deficiency of vitamin D to a host of common age-related problems. The current RDA is only 400 IU. As a
result of startling evidence of a widespread vitamin D deficiency, prominent nutritional scientists are calling on Americans to
increase their vitamin D intake to 1000 IU per day and higher. Currently, most experts in the field believe that intakes of between
1000 and 4000 IU for adults will lead to a more healthy level of serum 25(OH)D, at approximately 75 nmol/L.
Life Extension® recommends that healthy adults supplement each day with at least 1000 IU of vitamin D. Elderly adults may
benefit from higher doses such as 2000 IU daily, and even up to 5000 IU daily.

Supplement Facts
Serving Size 1 capsule
Servings Per Container 250
Amount Per Serving
Vitamin D3 1000 IU
Other ingredients: rice flour, gelatin, sucrose, dl-alpha tocopherol, corn starch, magnesium stearate.
Contains soybeans. Contains corn and rice.
This product contains NO milk, egg, fish, peanuts, crustacean shellfish (lobster, crab, or shrimp), tree nuts, wheat, yeast, or
gluten. Contains NO artificial sweeteners, flavors, colors, or preservatives.
Dosage and Use
Take one capsule daily, or as recommended by a healthcare practitioner.
This product is best utilized when taken in divided doses with fat-containing, low fiber meals.
Caution
Individuals consuming more than 2,000 IU/day of vitamin D (from diet and supplements) should periodically obtain a serum 25-
hydroxy vitamin D measurement. Toxicity is very unlikely in healthy individuals at a dose of less than 10,000 IU. Vitamin D
supplementation is not recommended for individuals with hypercalcemia (high blood calcium levels). People with kidney disease,
certain medical conditions (such as hyperparathyroidism or sarcoidosis), and those who use cardiac glycosides (digoxin) or
thiazide diurectics should consult a physician before using supplemental vitamin D.
Warnings