Vitamin C (ascorbic acid) is a water-soluble essential nutrient that the body cannot produce on its own, making dietary or supplemental intake necessary. Research suggests it plays a central role in immune function, collagen synthesis, and wound healing, while also acting as a potent antioxidant that helps protect cells from oxidative stress. Studies indicate that vitamin C may support cardiovascular health, enhance the absorption of non-heme iron from plant-based foods, and contribute to skin integrity and repair. While perhaps best known for its association with cold and flu support, the evidence points more toward a potential reduction in the duration and severity of symptoms rather than outright prevention. It is available in several supplemental forms, including ascorbic acid, sodium ascorbate, calcium ascorbate, and liposomal formulations.
Compare this supplementResearch suggests that vitamin C supplementation is associated with modest reductions in the duration and severity of...
View studies →Research suggests that vitamin C may offer antioxidant benefits through several mechanisms, including reducing oxidat...
View studies →Research suggests that the studies linked here do not meaningfully address Vitamin C or ascorbic acid as an intervent...
View studies →Research suggests that vitamin C plays a meaningful role in immune function through several proposed mechanisms, incl...
View studies →Research suggests that vitamin C plays an important role in skin health, with a 2018 review article indicating that i...
View studies →Research suggests that vitamin C plays a recognized role in collagen synthesis, though the single study linked here t...
View studies →Research suggests that the available evidence linking Vitamin C specifically to nutrient absorption is limited within...
View studies →Research suggests that vitamin C plays a supportive role in wound healing processes, particularly through its involve...
View studies →Very high-dose vitamin C may reduce vitamin B12 absorption.
View details →Both support antioxidant defenses through complementary mechanisms.
View details →Vitamin C significantly enhances non-heme iron absorption.
View details →Vitamin C regenerates oxidized vitamin E, creating a synergistic antioxidant network.
View details →Vitamin C is essential for collagen synthesis and enhances the effectiveness of collagen suppleme...
View details →Both support immune function through complementary mechanisms and are often combined for cold pre...
View details →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Capsule | 1,000–2,000 mg | Daily | Cardiovascular health and blood pressure support | Doses used in RCTs examining endothelial function and blood pressure |
| Powder | 500–1,000 mg | Daily | Collagen synthesis, wound healing, and skin health | Common in clinical trials on collagen production and wound repair |
| Tablet | 500–1,000 mg | Daily | Cold and flu prevention and duration reduction | Based on Cochrane reviews and RCTs on cold incidence and duration |
| Tablet | 25–100 mg | Daily | Enhancing non-heme iron absorption when taken with meals | Based on studies on ascorbic acid and dietary iron bioavailability |
| Tablet | 200–500 mg | Daily | General immune support and antioxidant protection | Common in clinical trials for immune function and antioxidant status |
| Topical | 5–20 % | Daily | Skin health, photoprotection, and anti-aging | Concentration range used in dermatological RCTs on ascorbic acid serums |