Vitamin D

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Vitamin D Overdose: Symptoms and Examples

Overdosing on vitamin D isn’t easy, but it is possible if you’re taking supplements. In contrast, your body doesn’t allow overdosing from the sun alone. When your vitamin D levels reach a high, potentially [more…]

How is Vitamin D Measured in the Body?

If you want to know whether you have enough vitamin D in your body, you must have a blood test for 25-hydroxyvitamin D. Depending on where you live, you may have trouble convincing your doctor to order [more…]

Watching for Vitamin D Deficiency in Children

Adequate levels of vitamin D are essential for children before birth, after birth, and throughout childhood to ensure the proper development of bones and teeth. If they get enough vitamin D throughout [more…]

How Vitamin D Affects Your Health

The medical community has known of the benefits of vitamin D on bone health for decades. In recent years, scientists have discovered that vitamin D may play a role in many other aspects of our health. [more…]

What is Vitamin D and How Does It Work?

Many people don’t have enough vitamin D, and are unaware of its many benefits. Scientists are discovering new possible roles for this important nutrient almost daily. If you think you have enough vitamin [more…]

What Are the Major Sources of Vitamin D?

Outside the body, vitamin D comes from three major sources: the sun, food, and supplements. Sunlight is considered to be the best source of vitamin D for your body, followed by foods that contain vitamin [more…]

How Much Vitamin D Does Your Body Need?

If you want to optimize your vitamin D levels, you'll need to know how much vitamin D you need in your diet to get there. You can get vitamin D from your diet and also after the sun stimulates your skin [more…]

How to Select the Best Sources of Calcium

Many of the best sources of calcium are also good sources of vitamin D, especially dairy foods such as milk, yogurt, and cheese. Other good sources are fortified cereals, tofu processed with calcium, enriched [more…]

Dealing with Too Much or Too Little Dietary Calcium

Your body typically adapts well to changing levels of dietary calcium. In relatively rare instances, however, your serum calcium levels may become too high or too low. Keep in mind that most adults need [more…]

Building Strong Bones with Vitamin D

Even before we knew what vitamin D was, we’ve understood that it is important for building strong bones. Bone isn’t an inert organ. It has critical functions in the body, which can be divided into three [more…]

The Importance of Vitamin D Levels at Age 70 and Beyond

As many as 70 percent of people age 70 and older have inadequate levels of 25-hydroxyvitamin D. They also tend to have low vitamin D levels all year long; they don’t get the summer boost from the sun. [more…]

Getting Enough Vitamin D before and during Pregnancy

Women should ensure that they have a satisfactory level of vitamin D both before and during pregnancy. Pregnant adult women and nursing mothers need 600 IU of vitamin D every day, and teen mothers need [more…]

What Is the Right Amount of Vitamin D for a Newborn Baby?

Although a newborn baby doesn’t need as much vitamin D as required by the pregnant or nursing mother, she continues to need sufficient vitamin D. Bones, organs, and critical structures in the brain are [more…]

What Are the Functions of Calcium in the Body?

Calcium is tightly linked to many of the roles that vitamin D plays in the body. In bone health (and other physiologic systems), calcium is a key player. Calcium is a mineral that must be constantly eaten [more…]

Looking at the U.S. Government’s Guidelines on Calcium

The U.S. Government has provided guidelines on calcium intake — Recommended Dietary Allowances (RDA) — based on age group (and gender, for those in the 51-70 age group). Because your body doesn’t make [more…]

Osteoporosis and Vitamin D

Osteoporosis is a brittle bone disease in which both the structure of the bone and its mineralization are reduced. Vitamin D deficiency may be a risk factor, especially for women. People with osteoporosis [more…]

Diagnosing and Treating Osteoporosis

Doctors diagnose osteoporosis by performing a bone densitometry test, which measures the amount of mineral per square centimeter of bone. The areas studied in a bone densitometry study are usually the [more…]

Vitamin D, Calcium, and Bone Health in Seniors

When seniors comply with their recommended calcium intake and their vitamin D levels are sufficient, bone fracture risk is significantly reduced compared to seniors who don’t get enough calcium or have [more…]

How Vitamin D Levels Affect Teeth

Teeth aren’t exactly bones, but they’re made up of similar tissues and are subject to the same problems bones may have. Vitamin D deficiency, including the conditions of rickets and osteomalacia, also [more…]

How Vitamin D Influences the Body’s Immune System

A lot of interesting research points to an important role for vitamin D (more specifically, calcitriol) in the body's immune system. Most of this research has been done in cultured cells [more…]

The Role of Vitamin D in Boosting the Immune System

Vitamin D may have a role in boosting the immune system and helping your body fight off nasty infections such as the flu and tuberculosis. Many books have been written about the positive effect of sunlight [more…]

The Role of Vitamin D in Multiple Sclerosis

Multiple sclerosis (MS) is an autoimmune disease that attacks a person’s own nervous system. Vitamin D deficiency may play a role in the onset and progression of multiple sclerosis. In MS, the myelin sheaths [more…]

The Role of Vitamin D in Rheumatoid Arthritis

Rheumatoid arthritis (RA) is an autoimmune disease that affects the synovial joints between bones. Vitamin D intake may modulate RA, because calcitriol modulates the adaptive immune system. Like all autoimmune [more…]

The Role of Vitamin D in Lupus

Systemic lupus erythematosis, often shortened to just lupus, is an autoimmune disease of the connective tissues that support and protect organs. Vitamin D deficiency may play a role in the development [more…]

The Role of Vitamin D in Graves’ Disease

Graves’ disease is an autoimmune disease in which the body’s metabolism speeds up. It's possible that vitamin D deficiency may play a role in the development of Graves' disease — there is some evidence [more…]


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