megavitamin

[meg-uh-vahy-tuh-min; British also meg-uh-vit-uh-min]
adjective
1.
of, pertaining to, or using very large amounts of vitamins: megavitamin therapy. Compare orthomolecular.
noun
2.
megavitamins, doses of vitamins much larger than the recommended dietary allowances.

Origin:
1965–70; mega- + vitamin

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

megavitamin meg·a·vi·ta·min (měg'ə-vī'tə-mĭn)
n.
A dose of a vitamin greatly exceeding the amount required to maintain health.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Always talk to your doctor before taking megavitamin therapy, herbal products, or any other dietary supplement.
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