Vitamin D & Your Bones

There are two groups of vitamins. Water soluble and Fat soluble. Vitamin D is a group of Fat soluble pro hormones which is synthesized in body and works as hormone. Two most important forms of Vitamin D are:

Vitamin D2 (Ergocalciferol): This is activated ergosterol and is of plant origin.

Vitamin D3 (Cholecalciferol): This is synthesized in skin on irradiation of 7-dehydrocholesterol.


1-      Bone formation

2-      Muscle strength

3-      Regulation of cell growth

4-      Hair Growth

5-      Immune Function

6-      Reduces the risk of autoimmune disease

7-      Fighting infections

Physiological Role of Vitamin D:

Vitamin D increases the absorption of calcium and efficient utilization and maintains normal health of bone and teeth.

It also maintains the proper level of calcium when works with PTH. Calcitriol works with PTH to maintain normal calcium level.

Vitamin D also regulates normal cellular growth and functions in our brain cells.

Diseases Due to Vitamin D:

Vitamin D deficiency: Deficiency of Vitamin D may cause various chronic diseases like Breast Cancer, Colon Cancer, Type 2 Diabetes, Ovarian Cancer, Hypertension and most importantly “Osteoporosis”. Overdosing of Vitamin D may lead to toxicity.

Vitamin D and Arthritis:

Many patients with Joint pain have been detected accidently with vitamin D deficiency. Lack of vitamin D results in pain in joints; especially in winter due to lesser expose to sun and decreased production of Vitamin D. Decreased Vitamin D level may give rise to Arthritis which may even worsen due to the same. Some chronic arthritis symptoms may be reflected in person suffering with vitamin D deficiency.

Deficiency of Vitamin D may also lead to Rickets, Osteomalacia, Osteoporosis etc.

Symptoms of Vitamin D deficiency:

1-      Stooped posture along with inflamed bones, pain in bones and stiff spine.

2-      Chances of multiple fracture increases.

3-      Bones become tender and diffuse especially spine and ribs.

4-       Sometimes depression.

5-      Fluctuation in Heamogram report.

6-      Fluctuation in alkaline phosphate and parathormone level.

7-      Proteinurea may be observed in traces

8-      Weak immune system.

Recommended dietary allowances: According to food and nutrition board,

Age Male Female Pregnancy Lactation
0-12 Months 10 Mcg 10 Mcg
01-13 Years 15 Mcg 15 Mcg
14-18 Years 15 Mcg 15 Mcg 15 Mcg 15 Mcg
19-50 Years 15 Mcg 15 Mcg 15 Mcg 15 Mcg
51-70 Years 15 Mcg 15 Mcg
>70 Years 20 Mcg 20 Mcg


Sources for Vitamin D:

1-      Direct exposure to sunlight for 30 min per day.

2-      Fortified foods.

3-      Egg, Meat, Fish & Milk provides inactivated form of Vitamin D.

4-      Other major sources are fish oils and fatty fish.

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