Life Extension recommends normal healthy adults to consume around 1000 IU of Vitamin D daily. However, elderly people may benefit more from taking around 2000-5000 IU per day. With proper medical recommendation, Life Extension Vitamin D3 provides a safe and potent dosage at 5000 IU of Vitamin D daily. It is crucial to take regular CBC/Chemistry blood tests when taking a high dosage of Vitamin D3 supplements to reduce the risks of kidney damage or hypercalcemia.

Vitamin D is a steroid vitamin found in most food sources such as fatty fish, eggs, and beef liver. It is also naturally produced by our skin through regular sun exposure. However, due to weather changes when people do not usually experience natural sunlight, a lot of people may suffer from Vitamin D deficiency. Studies show that the inconsistency of Vitamin D levels in humans greatly attribute to the seasonality of influenza. Vitamin D supplementation has increasingly become a need for most people to ensure that they receive the recommended amount of Vitamin D daily/

Vitamin D helps keep our bones, kidneys, and intestines healthy. It plays a key role in regulating adequate levels of calcium and phosphorus in the body. Vitamin D is responsible for making sure that the body absorbs calcium properly for healthy bones and joint functions. It reduces the risks of osteoporosis, immune infections, and high blood pressure.

Aside from people who do not get regular sun exposure, individuals who are elderly and/or obese need to get higher doses of Vitamin D supplementation. The Recommended Daily Allowance for Vitamin D is currently 400 IU. Due to the increasing number of people with Vitamin D deficiency, nutritionists now recommend up to 1000 IU a day or higher. Taking 1000-4000 IU per day may lead to healthier serum 25(OH)D levels at roughly 75 nmol/L.