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What is an international unit?

Grant Cooper, MD
Physical Medicine & Rehabilitation
An International Unit, or IU, is the amount of a certain substance that is required to produce a given effect. It is a way to standardize the amount of a given substance, such as a vitamin or mineral, without simply relying on weight.
The Arthritis Handbook: Improve Your Health and Manage the Pain of Osteoarthritis (A DiaMedica Guide to Optimum Wellness)

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The Arthritis Handbook: Improve Your Health and Manage the Pain of Osteoarthritis (A DiaMedica Guide to Optimum Wellness)

According to conventional wisdom, arthritis pain is an inevitable part of aging. Not so, says Dr. Grant Cooper in this practical, accessible guide. For those who do develop osteoarthritic conditions,...
Dr. Robin Miller, MD
Internal Medicine

If you've wondered what the term International Unit on vitamin bottles and other supplements means, watch this video. Dr. Robin Miller explains what it is and why it can vary from one type of supplement to another.


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What Is an International Unit?
What Is an International Unit?

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.