Emergen-C is an effervescent, powdered drink mix vitamin supplement manufactured by Alacer Corp, now owned by Pfizer. It contains, depending on the variety, 16 times the vitamin C, 4 times the vitamin B12, and 5 times the vitamin B6 of the USDA Reference Daily Intake based on a 2000 calorie diet. The efficacy of vitamin C megadoses as a cold remedy has not been firmly established in the scientific literature.
Emergen-C is available in a variety of flavors. Some flavors also include additional supplements, such as calcium, glucosamine, quercetin, or lycopene.
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