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Vitamin C
(as ascorbic acid)

In every dose: 750 mg.

What's In It For
My Immune System?

An essential micronutrient and potent antioxidant.

It supports epithelial barrier function against pathogens and promotes the oxidant scavenging activity of the skin, thereby potentially protecting against environmental oxidative stress. 

Supplementation with vitamin C appears to be able to both prevent and treat respiratory infections.

Synergies
Vitamin C + Iron

We don't absorb 100 percent of the iron in food, especially non-heme iron from plant foods. Vitamin C (ascorbic acid) acts as a catalyst to help our bodies absorb iron better from food and from supplements. This is important because iron is an essential component of hemoglobin, the substance in red blood cells that delivers oxygen to every cell in your body. Without enough iron and oxygen, you're likely to feel tired, your immune system's ability to fight off infections will take a hit and your brain function may not be as sharp as it could or should be.

Science

We use nutrients backed by a significant body of research that is growing every day. Of the thousands of unaffiliated studies our in-house scientists sorted through to guide our choices, the titles below are the most relevant.

Vitamin C and Immune Function

https://www.ncbi.nlm.nih.gov/pubmed/29099763
A Review of Micronutrients and the Immune System-Working in Harmony to Reduce the Risk of Infection

https://pubmed.ncbi.nlm.nih.gov/31963293/
A new clinical trial to test high-dose vitamin C in patients with COVID-19.

https://www.ncbi.nlm.nih.gov/pubmed/32264963

Vitamins

Vitamin D3

Vitamin C

Vitamin A

Vitamin B6

Vitamin B12

Folate