---
title: "Vitamin C: Fueling Nitric Oxide for Healthy Blood Vessels"
description: Vitamin C supports nitric oxide production and endothelial health, helping sustain blood vessel function and normal blood pressure.
image: https://www.casi.org/hubfs/casi/featured/2-22-vitc-fueling-nitric-oxide.jpeg
---

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# Vitamin C: Fueling Nitric Oxide for Healthy Blood Vessels

DM Danielle C. Male, MS, CNS, LDN Feb 22, 2024

![Vitamin C: Fueling Nitric Oxide for Healthy Blood Vessels](https://www.casi.org/hs-fs/hubfs/casi/featured/2-22-vitc-fueling-nitric-oxide.jpeg?width=960)

While most people are familiar with vitamin C’s role in promoting [immune health](https://www.casi.org/articles/acerola-fruit-vitamin-c-status-absorption), its lesser-known role is promoting cardiovascular health through its interactions with nitric oxide (NO) and the blood vessel lining, or endothelium. Vitamin C (also referred to as ascorbate) plays a beneficial role in promoting [endothelial function](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/) and maintaining [vascular integrity](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/). 

## Collagen Synthesis

Vitamin C promotes endothelial cells to proliferate and to form capillary-like structures in vitro, likely due to its ability to increase the [synthesis of type IV collagen](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/), which is required for basement membrane formation and endothelial cell adhesion. Furthermore, vitamin C has also been shown in vitro to [prevent apoptosis of endothelial cells](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/) induced by high glucose conditions, tumor necrosis factor-alpha, and lipopolysaccharides. In vitro studies also suggest that vitamin C can [tighten the permeability barrier of endothelial cells](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/) in long-term culture. 

## Antioxidant Support

As a [potent antioxidant](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/), vitamin C may help attenuate the oxidative stress and inflammation associated with vascular dysfunction. Vitamin C can [scavenge free radical species](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/) that have entered the cells or been produced endogenously from normal cellular reactions, such as mitochondrial energy production or [uncoupling](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production) of nitric oxide synthase (NOS).

## Supporting the Endogenous Synthesis of Nitric Oxide

Nitric oxide is [endogenously produced](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production) as a by-product of the oxidation of the amino acid L-arginine, catalyzed by [endothelial nitric oxide synthase](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10578647/) (eNOS) – an [isoform of NO synthase (NOS) enzymes](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3345541/). Vitamin C helps promote eNOS activity by changing its [phosphorylation and S-nitrosylation status and upregulating eNOS expression](https://pubmed.ncbi.nlm.nih.gov/24333161/). This is important because one of NO’s primary functions is to serve as a [vasodilator](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6683098/) to promote increased blood supply to tissues and to relax the inner muscles of blood vessels. As a result, NO helps to promote [normal blood pressure and blood flow](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6683098/), increasing the delivery of oxygen and nutrients to tissues and facilitating the clearance of metabolic by-products. 

Along with arginine, [BH4 (tetrahydrobiopterin)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/) is a required co-factor for eNOS activation in NO production. During the enzyme cycle, BH4 donates an electron to the active dimeric form of eNOS and becomes a tetrahydrobiopterin radical. This radical needs to be efficiently reduced back to BH4 by [vitamin C specifically](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/). Failure to reduce BH4 does [two primary things](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/): it inhibits NO production and increases the production of superoxide (instead of NO), which can further react with NO to form peroxynitrite – another source of oxidative stress. Vitamin C’s antioxidant properties allow it to scavenge both [superoxide and peroxynitrite](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869438/). However, by helping recycle BH4 in the first place, vitamin C helps mitigate the loss of BH4 and sustains eNOS activity. 

## Supporting the Exogenous Synthesis of Nitric Oxide

Another pathway the body uses to maintain optimal NO status is an [exogenous pathway](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production) called the [enterosalivary pathway](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production). The enterosalivary pathway produces the same [biologically active NO](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3390088/) produced through the endogenous pathway but with [dietary nitrate](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3390088/)s as the precursor rather than L-arginine. In this pathway, dietary nitrate is converted into [salivary nitrite](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production). Once salivary nitrates are swallowed into the [stomach](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production), the nitrites must be reduced to NO by the [acidic environment](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production) and in the presence of endogenous reductants, such as [vitamin C](https://www.casi.org/articles/dual-pathways-nutrients-enhanced-nitric-oxide-production). Thus, vitamin C further helps promote NO production and bioavailability. 

## Conclusion

Due to its numerous roles in promoting endothelial health and NO production, vitamin C is a water-soluble vitamin that may help support [healthy blood pressure](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7034722/) in the general population. Supporting adequate vitamin C intake may be especially clinically relevant to older individuals or those with [hypertension](https://pubmed.ncbi.nlm.nih.gov/33183558/), [type 2 diabetes mellitus](https://pubmed.ncbi.nlm.nih.gov/33642340/), or [hypercholesteremia](https://pubmed.ncbi.nlm.nih.gov/33115598/). 

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### Danielle C. Male, MS, CNS, LDN

Clinical Application

## Clinical Considerations in Practice

 In clinical practice, practitioners considering the topics discussed above may also weigh nutrient form, delivery and formulation, alongside individual patient variability.

### Practitioner Formulation Example

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#### [Science Update A Case Report on a Homocysteine-Supporting Nutraceutical in Seven Patients with Elevated Homocysteine Mar 23, 2026](https://www.casi.org/articles/homocysteine-supporting-nutraceutical)

#### [Research & Education How Intestinal Permeability Impacts Inflammatory Responses and Cardiovascular Health Jan 29, 2026](https://www.casi.org/articles/intestinal-permeability-inflammatory-responses-cardiovascular-health)

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