Vitamin D Fact Sheet, FAQs & Product List

Vitamin D information, FAQ and product listing page. This page contains everything you need to know about vitamin D.

What is vitamin D and what does it do?

Vitamin D is a fat soluble vitamin, essential for the maintenance of calcium metabolism. By itself, vitamin D is biologically inactive, meaning it must be metabolized to its biologically active forms. Once introduced to the body (by way of consumption or synthesis), it goes into circulation throughout our bodies and helps with a plethora of bodily functions including the maintaining of calcium balance, cell differentiation, regulation of the immune system, and the controlling of blood pressure.

Calcium balance - Vitamin D is critical for efficient utilization of calcium by the body. Vitamin D maintains the serum calcium levels, which is not only important for the functioning of the central nervous system, but for bone growth and maintenance of bone density. (1)

Immunity - Vitamin D is a very strong immune system modulator. There is strong scientific evidence that vitamin D has a variety of beneficial effects on the immune system and it’s functioning, which can inhibit the development of auto immunities. (2)

The regulation of blood pressure is controlled partly by the rennin-angiotensin system. This system requires both renin and angiotensin to function properly. Studies have shown that inadequate levels of vitamin D have decreased these components, hence decreasing the risk of high blood pressure in those that are taking their recommended daily allowance of vitamin D. (3)

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What foods contain vitamin D?

Vitamin D is found naturally in only a select amount of foods. Foods that contain vitamin D consist of some fatty fish (salmon, sardines), fish oils, and eggs from hens that have been injected with vitamin D. Milk and infant formula in the United States are fortified with vitamin D. While these contain about 10 mcg per quart, other dairy products like cheese and yogurt may not. Other items containing vitamin D are bread, orange juice, and some cereals.

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What is the suggested intake of vitamin D?

In 1997, the Food and Nutrition Board of the Institute of Medicine, the organization that creates the Recommended Dietary Allowances (RDAs) concluded that due to sunlight exposure having an effect on vitamin D levels on one’s body, it was impossible to make an RDA for vitamin D.

Because of this, the adequate intake levels assume that no vitamin D is being synthesized in the skin by the sun’s ultraviolet rays. With this taken into consideration, please note that the following adequate intake levels reflect only vitamin D that is consumed, not synthesized. (5)

Adequate Intake (AI) for Vitamin D:

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What are the signs of vitamin D deficiency?

When the body lacks vitamin D, calcium absorption cannot be increased enough to satisfy its needs. Because of this, PTH production by your parathyroid glands is increased and calcium is transferred from your skeletal bones to participate in this process. This is known as secondary hyperparathyroidism. In addition to a severe risk in the healthiness of your bones, it increases your risk of osteoporosis and an array of other health problems.

Rickets – In both infants and children, a several vitamin D deficiency results in that inability for your body to mineralize bones. Bones that are rapidly growing are most affective by this. Without mineralization, weight-bearing limbs (arms, legs) become bowed. In severe cases, this is accompanied with low serum levels that can cause seizures. (4)

Osteomalacia – Although adult bones no longer continue to grow, they are constantly turning over (remodeling). In vitamin D deficiency with adults, the bone matrix is preserved but bone mineral is lost. This results in bone pain and very weak, soft bones.

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Who can benefit from using vitamin D supplements?

Everybody can benefit from taking vitamin D. Vitamin D helps prevent many common diseases and illnesses that inflict millions every year, including breast cancer, colorectal cancer, prostate cancer, osteoporosis, autoimmune diseases, and high blood pressure. (6)

Benefits to bodybuilders/athletes:

• Maintains healthy strong bones
• Helps prevent muscle cramps

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Does vitamin D have any side effects?

No, as long as you don’t take too much. It’s recommended that you do not take more than 50 mcg daily, as prolonged exposure to too much vitamin D can cause bone loss, kidney stones, and calcification of organs such as your heart and kidneys if left untreated. (7)

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VITAMIN D PRODUCTS ON SALE NOW:

Opti-Men Multivitamin Optimum Nutrition's Opti-Men combines Vitamins and Essential Minerals with an all-inclusive array of herbs and other ingredients specifically designed for males.	Opti-Women Multivitamin Opti-Women Multi-Vitamin provides the perfect balance of vitamins, minerals, antioxidants, extracts and herbs to supplement a women's diet and workout.
Ubiquinol CoQH-CF NOW Foods Ubiquinol CoQH-CF contains the reduced form of CoQ10 which is a highly bioavailable and active antioxidant form of CoQ10.	Animal Pak Animal Pak is a vitamin, mineral, EFA and amino acid supplement designed for people that regularly undergo intense training sessions and need the nutrition to back it up!
MultiPro 32X AST's MultiPro 32X is the world’s first multivitamin/multimineral supplement designed to exceed the needs of the hard trained athlete. AST Multipro 32X is a multi-vitamin, multi-mineral and is rich in potent antioxidants.	Activite Sport Activite Sport is the world's first interactive Multi-Vitamin and mineral complex engineered exclusively for people who work out and demand more from their multivitamin!
Super Vitamin Pak Super Vitamin Pak contains 30 individually packed pouches, each containing a full-day supply of vitamins and minerals required to keep your body at optimum performance levels.	Daily One Caps Daily One Caps are great because you only need to take one capsule per day and they give you much more than normal multivitamins! Daily one caps are designed for athletes and sports people who need a bit extra from their multi!
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CLA Extreme CLA Extreme combines the benefits that active people are seeking with the proven effectiveness of Conjugated Linoleic Acid (CLA).	Tight Curves Women's Multivitamin Tight Curves Women’s Multi-Vitamin & Mineral is formulated to support a woman's unique nutritional needs and includes newly discovered Resveratrol.
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EFA Lean Gold Labrada EFA Lean Gold provides you with not only optimal quantities of all three fatty acid groups = Omega-3, Omega-6, and Omega-9 in the healthful ratio of 2:1:1, but also CLA and GLA.	Pro V60 ProV60 is an instant, multi-purpose protein blend that provides both men and women alike with a delicious, convenient way to get all of the additional protein that their bodies need for today's active lifestyles.
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Lean Body Sweet & Salty Granola Bars	Lean Body Cookie Bars Labrada's Lean Body Hi-Protein Cookie Bar is also the first-ever microwavable high protein bar. And this bar's got nutrition to spare.
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Citrulline Citrulline is a non-essential amino acid that is an important intermediate in the urea cycle, functioning along with Arginine and Ornithine to rid the body of ammonia, a byproduct of protein metabolism.	L-Tyrosine 500mg L-Tyrosine is necessary for the synthesis of thyroid hormone and epinephrine (adrenaline), L-Tyrosine supports healthy glandular function and stress response.
Water Out NOW Foods Water Out is a synergistic herbal blend that supports urinary tract health.

1. Holick MF. Vitamin D: importance in the prevention of cancers, type 1 diabetes, heart disease, and osteoporosis. Am J Clin Nutr. 2004;79(3):362-371
2. Griffin MD, Xing N, Kumar R. Vitamin D and its analogs as regulators of immune activation and antigen presentation. Annu Rev Nutr. 2003;23:117-145.
3. Sheng H-W. Sodium, chloride and potassium. In: Stipanuk M, ed. Biochemical and Physiological Aspects of Human Nutrition. Philadelphia: W.B. Saunders Company; 2000:686-710.
4. Wharton B, Bishop N. Rickets. Lancet. 2003;362(9393):1389-1400.
5. Food and Nutrition Board, Institute of Medicine. Vitamin D. Dietary Reference Intakes: Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride. Washington D.C.: National Academies Press; 1999:250-287.
6. Garland CF, Garland FC, Gorham ED. Calcium and vitamin D. Their potential roles in colon and breast cancer prevention. Ann N Y Acad Sci. 1999;889:107-119.
7. Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357(3):266-281.

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