Vitamin C, also known as ascorbic acid, is an essential water-soluble vitamin that plays a crucial role in numerous physiological functions. As an antioxidant, it helps protect cells from damage caused by free radicals. The human body cannot synthesize Vitamin C, meaning it must be obtained through diet or supplementation. Key dietary sources include citrus fruits, bell peppers, broccoli, and tomatoes. It is involved in collagen formation, which is vital for skin, blood vessels, bones, and cartilage. It also contributes to immune function, supports iron absorption, and is involved in neurotransmitter biosynthesis. Serious deficiency of Vitamin C leads to scurvy, a condition characterized by fatigue, gum disease, and poor wound healing. While scurvy is rare in developed countries, suboptimal intake can still affect health. (NIH Office of Dietary Supplements, MedlinePlus)
Deep dive
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Known interactions
Compound-pair rule
Synergy
Vitamin C increases absorption of non-heme (supplement) iron.
Fine to take together; no need to separate.
Category rule: vitamin × medication
Note
Certain vitamins interact with specific medications (e.g., vitamin K with blood thinners).
Specific pairs are checked against a licensed source; confirm with your provider.
Compound-pair rule
Synergy
Vitamin C converts iron to more absorbable ferrous form.
Take iron with 200–500 mg vitamin C to boost absorption.
Frequently asked
Sources referenced
["Cochrane Library","DrugBank","Examine.com","Linus Pauling Institute, Oregon State University","Mayo Clinic","MedlinePlus","NIH National Cancer Institute","NIH National Eye Institute","NIH Office of Dietary Supplements (ODS)","PubChem"]
Stackwise compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician.
Related compounds
Others in the vitamin category or studied for the same goals.