Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
Calcium supplements support bone health, usually taken with vitamin D. They are used in deficiency, osteoporosis prevention, pregnancy and for people who don’t get enough calcium from food.
Typical dose — general reference only, NOT a prescription
Measure
Range
Category
Over-the-counter (OTC)
Adult dose
500–1000 mg elemental calcium/day (often with vitamin D), split doses for better absorption
Child (paediatric) dose
Prefer dietary calcium; supplements only if a doctor advises, age-based
What it is used for
Bone health and osteoporosis prevention
Calcium deficiency
Pregnancy and breastfeeding needs
With vitamin D for bone protection
Common brand names
India: Shelcal, Calcimax, Gemcal, Cipcal
Worldwide: Caltrate, Citracal, Os-Cal
Common side effects
Constipation or bloating
Wind
Rarely, kidney stones with excess
Before taking it — precautions
Take in split doses (absorption is better ≤500 mg at a time)
Separate from iron and thyroid medicine
Do not exceed recommended amounts
When to see a doctor urgently
Symptoms of high calcium: nausea, excessive thirst, confusion
Kidney stones with long-term excess
Doses are a general reference, not a prescription. Doses shown are typical adult/paediatric references and vary with age, weight, kidney/liver function and the exact product. Paediatric doses are usually weight-based and must be set by a doctor. MedDroid cannot prescribe — always confirm calcium supplement and your dose with a doctor or pharmacist and the leaflet inside the pack.
Frequently asked questions
Should I take calcium with or without food?
Calcium carbonate is best with food; calcium citrate can be taken any time. Split larger amounts across the day for better absorption.
Do I need vitamin D with calcium?
Usually yes — vitamin D helps the body absorb calcium, which is why they are often combined.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.