Vitamins & Minerals — test before you supplement

### About this concern

Indian adults are widely deficient in certain vitamins and minerals — vitamin D, B12, iron, calcium, sometimes magnesium. But the answer is not to walk into a pharmacy and self-prescribe a strip of capsules. Some of these nutrients can become harmful in excess, and the right dose depends on your specific levels, your age, your diet, and your other medical conditions. The simple rule is: test first, consult a doctor, then supplement.

### What we know

Common Indian deficiencies and why:

• **Vitamin D** — India has plenty of sun, but most urban adults stay indoors, wear long sleeves, and have darker skin tones that need more sun exposure. Vegetarian diets contribute too. Low vitamin D affects bones, immunity, and mood.
• **Vitamin B12** — very common in vegetarian and lacto-vegetarian Indians, because B12 is mostly found in animal foods. Symptoms include tiredness, tingling in feet, poor memory, and anaemia.
• **Iron** — common in women of reproductive age and in vegetarians. Symptoms include tiredness, breathlessness, hair fall, brittle nails, pale skin.
• **Calcium** — important for bones; intake is low in adults who avoid dairy or have lactose intolerance.
• **Magnesium** — often low alongside other deficiencies; can show up as muscle cramps, poor sleep, palpitations.
• **Folate, zinc, vitamin A, iodine** — also worth knowing about in specific groups.

Why testing matters: taking high-dose vitamin D without knowing your starting level can push you into toxic range, causing high calcium, kidney stones, and other problems. Iron tablets given to someone who is not deficient can cause constipation, stomach upset, and even harm in conditions like haemochromatosis. B12 dosing depends on whether the deficiency is dietary, absorption-related, or due to medications like metformin or PPIs. Calcium overuse can cause kidney stones and may interact with thyroid tablets.

### What to watch for

• Persistent tiredness, brain fog, low mood.
• Hair fall, brittle nails, pale skin.
• Bone or joint aches, muscle cramps.
• Tingling or numbness in hands or feet.
• Frequent infections.
• Heavy periods (consider iron).

These can have many other causes too. A blood test is the simple next step.

### What you can do safely

• Get a basic panel done — vitamin D, B12, ferritin (iron stores), CBC, calcium, magnesium — once a year if you have symptoms or are in a high-risk group. Many Chennai labs offer affordable panels.
• Prioritise food sources first:
• Vitamin D — 15-20 minutes of morning or late-afternoon sun on arms and face several days a week, if your skin allows.
• B12 — eggs, dairy, fish, meat for non-vegetarians; fortified foods or supervised supplements for vegetarians and vegans.
• Iron — leafy greens, dals, jaggery, dates, raisins, ragi, eggs, meat; pair with vitamin C foods like lemon, amla, citrus to improve absorption; avoid tea/coffee with meals.
• Calcium — milk, curd, paneer, ragi, sesame seeds, green leafy vegetables.
• Magnesium — nuts, seeds, whole grains, green vegetables.
• Take your report to a doctor and let them decide the dose, the form, and the duration.
• Re-test after the doctor-advised period to confirm levels have corrected — and then revise the dose.

### When to see a doctor

Please consult a doctor before supplementing if you are pregnant or lactating, are a child or elderly, have kidney disease, thyroid disease, diabetes, are on prescription medication, or have a known medical condition. Please consult urgently if you have severe tiredness, breathlessness, chest pain, fainting, severe muscle weakness, or persistent tingling — these need evaluation, not just a vitamin tablet.

### What we do NOT recommend over the counter

We do not recommend buying high-dose vitamin D shots, B12 injections, iron tablets, calcium combos, or imported "multivitamin stacks" without a recent blood report and a doctor's input. We do not recommend stacking multiple supplements from different brands. We do not recommend believing that more is better — for micronutrients, the right amount, for the right duration, based on your report, is what helps. Test first, consult, then supplement.