Emergen-C

Emergen-C is an effervescent, powdered drink mix vitamin supplement manufactured by Alacer Corp. The Emergen-C product line was introduced in 1978. Alacer was established as a private company in 1972, focusing on vitamin supplements containing vitamin C. The company was acquired by Pfizer in 2012. In 2019, Pfizer consumer healthcare entered a joint venture with GSK. The brand is owned by Haleon since 18 July 2022.

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. Some versions include calcium, glucosamine, quercetin or lycopene.