Vitamin D-3 4000 IU 120 caps by Kirkman Labs

Vitamin D has many roles in the body. This nutrient is needed for bone growth and maintenance. Strong evidence suggests that it supports calcium absorption, modulates cell growth and supports neuromuscular and immune system function.

Scientists are discovering that inadequate vitamin D is a widespread problem. As a result, there have been several recent increases in the recommended daily intake of vitamin D. In 2008, the American Academy of Pediatrics updated guidelines for vitamin D daily intake for infants 0-1 year old and children and adolescents from 200 IU to 400 IU. In 2010, the Institute of Medicine set new recommended daily allowances for those 1-70 years of age at 600 IUs; for those 71 years and older, 800 IUs; and for pregnant and lactating women, 600 IUs.

Relatively few foods naturally contain vitamin D. It is best obtained from sunshine; however, the use of sunscreen can limit the amount of vitamin D absorbed from the sun. People living in cloudy or rainy climates are also often prone to low vitamin D levels. Certain cod liver oils can also be a good source of vitamin D.

Vitamin D levels fluctuate in the body due to many factors. Laboratory tests can be done to establish a baseline level that physicians may use to suggest adequate supplementation.

Frequently Asked Questions

What does vitamin D do in the body?

Vitamin D supports several core functions. It is needed for bone growth and maintenance, supports calcium absorption, modulates cell growth, and supports neuromuscular and immune system function.

Why might someone consider a vitamin D supplement?

Inadequate vitamin D levels are common. Relatively few foods naturally contain vitamin D, and while sunshine is the best natural source, sunscreen use can limit how much vitamin D the skin absorbs, and people in cloudy or rainy climates are also often prone to low levels.

How much vitamin D is recommended daily?

Recommended intake has increased in recent years. In 2010 the Institute of Medicine set recommended daily allowances of 600 IU for those 1 to 70 years old, 800 IU for those 71 and older, and 600 IU for pregnant and lactating women, following the American Academy of Pediatrics' 2008 update raising infant guidance from 200 IU to 400 IU.

Are there food sources of vitamin D?

Yes, though options are limited. Relatively few foods naturally contain vitamin D, but certain cod liver oils can be a good source.

Should I have my vitamin D levels checked before supplementing?

It can help to know your baseline. Vitamin D levels fluctuate in the body due to many factors, and laboratory tests can be used to establish a baseline that a physician may use to suggest adequate supplementation.