Selenium

Trace mineral
ALSO SOLD WITHOUT PRESCRIPTION

Selenium is a trace mineral found in 1 medicine sold in India, such as Cobadex CZS. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.

What it is used for

Part of the body's antioxidant defences; included in many multivitamins.

How it works

A trace mineral used by antioxidant enzymes and the thyroid; India's diet usually provides enough.

How to take it

Usually 50 to 200 mcg a day; do not exceed 400 mcg.

Common side effects

  • Garlic breath
  • Metallic taste

Get medical help straight away if

Hair loss, brittle nails or skin rash (too much)

Be careful

Too much over time is harmful (hair and nail changes).

Other medicines and interactions

High doses may add to blood-thinner effects.

Pregnancy and breastfeeding

Usual doses only; ask your doctor before taking supplements in pregnancy or while breastfeeding.

Combination medicines that contain Selenium (1)

Cobadex CZS

Common questions

What is Selenium used for?

Part of the body's antioxidant defences; included in many multivitamins.

How does Selenium work?

A trace mineral used by antioxidant enzymes and the thyroid; India's diet usually provides enough.

How should I take Selenium?

Usually 50 to 200 mcg a day; do not exceed 400 mcg.

What are the side effects of Selenium?

Common: Garlic breath, metallic taste. Get help straight away for: Hair loss, brittle nails or skin rash (too much).

Does Selenium interact with other medicines?

High doses may add to blood-thinner effects.

Is Selenium safe in pregnancy and breastfeeding?

Usual doses only; ask your doctor before taking supplements in pregnancy or while breastfeeding.

Does Selenium need a prescription in India?

It is usually sold without a prescription in India, but ask a pharmacist if you take other medicines or have a long-term illness.

Which brands contain Selenium?

Cobadex CZS.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.