Definition of "mcg" []

• (metrology) Symbol for the microgram, an SI unit of mass equal to 10−6 grams. (abbreviation)

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• "SELECT (SELenium and vitamin E Cancer prevention Trial) originally ran from August 2001 through June 2004 and involved 35,000 men assigned to follow one of four different interventions per day: 200 micrograms (mcg) of L-selenomethione (selenium) plus a vitamin E placebo; 400 IU vitamin E (as alpha-tocopherol) plus a selenium placebo; 200 mcg selenium plus 400 IU vitamin E; or placebo of both."
• "Chemet® is indicated for the treatment of lead poisoning in children with blood lead levels above 45 mcg./dL."
• "You don't need to take more than about 200 micrograms (mcg) of selenium per day and it starts getting toxic at four to five times that level (10)."