India is one of the sunniest countries in the world, so it surprises many people when a routine blood test shows low vitamin D. Yet studies across Indian cities have repeatedly found that a large share of adults, and many children, have levels below the recommended range. Because the symptoms are vague, most people do not realise they are deficient until a test is done.
Why is vitamin D important?
Vitamin D helps the body absorb calcium and phosphorus from food, which keeps bones and teeth strong. It also supports muscle function and plays a role in the immune system. Long-term deficiency can lead to softening of the bones (osteomalacia) in adults and rickets in children, and it raises the risk of osteoporosis and fractures later in life.
Why is deficiency so common in India?
- Indoor lifestyles: office work, long commutes and screen time keep many people out of direct sunlight during the day.
- Clothing and sunscreen: covering most of the skin, while sensible for heat, reduces the skin area that can make vitamin D.
- Air pollution: smog and haze in many cities filter out part of the UVB rays the skin needs.
- Darker skin tones: more melanin means the skin needs longer exposure to make the same amount of vitamin D.
- Diet: many Indian diets, especially vegetarian ones, contain few natural sources of vitamin D, and fortified foods are not yet universal.
Common symptoms
Mild deficiency often causes no symptoms at all. When symptoms appear, they can include:
- Constant tiredness and low energy
- Aches in the bones, especially the lower back, hips and legs
- Muscle weakness or cramps
- Frequent colds and infections
- Low mood
- Slow healing of wounds
These symptoms overlap with many other conditions, which is why a blood test is the only reliable way to know.
Which test should you ask for?
The standard test is the 25-hydroxy vitamin D (25(OH)D) blood test. Results are usually reported in ng/mL. Labs and guidelines differ slightly, but a commonly used interpretation is:
| 25(OH)D level | Commonly read as |
|---|---|
| Below 12 ng/mL | Deficient |
| 12 to 20 ng/mL | Insufficient |
| 20 to 50 ng/mL | Adequate for most people |
| Above 50 to 60 ng/mL | Higher than needed; very high levels can be harmful |
Your doctor will interpret the result together with your age, health conditions and any medicines you take.
Best food sources
- Fatty fish such as salmon, mackerel (bangda) and sardines (mathi)
- Egg yolks
- Fortified milk, curd and edible oils: check labels for "fortified with vitamin D"
- Mushrooms, especially those exposed to sunlight or UV light
- Fortified cereals
Food alone rarely fixes a true deficiency, but it helps maintain healthy levels.
Getting vitamin D from the sun safely
Short, regular exposure of the arms and legs to sunlight a few times a week can help the skin make vitamin D. Late morning to early afternoon is when UVB rays are strongest. Avoid burning, and remember that sitting behind glass does not work because glass blocks UVB.
What about supplements?
If your level is low, your doctor may prescribe vitamin D3 tablets, sachets or capsules for a set period, followed by a lower maintenance dose. Do not self-prescribe high-dose weekly capsules for months without testing. Vitamin D is fat-soluble, so excess builds up in the body and can raise calcium to dangerous levels.
The bottom line
If you feel constantly tired, have unexplained body aches or rarely get outdoors, ask your doctor about a 25-hydroxy vitamin D test. A mix of safe sunlight, fortified foods and, when needed, a supervised supplement course is usually enough to bring levels back to normal.
Disclaimer: This article is for general information only and is not medical advice. Please consult a qualified doctor for advice about your own health.
