vitamin c

https://www.cancermonthly.com/iNP/view.asp?ID=187

"Thus, the authors of this study conclude, 'Ascorbic acid supplementation provides a protective effect against exercise-induced airway narrowing in asthmatic subjects.'" https://www.vitasearch.com/get-clp-summary/36215

"Combined treatment with vitamins C and E has beneficial effects on endothelium-dependent vasodilation and arterial stiffness in untreated, essential hypertensive patients. This effect is associated with changes in plasma markers of oxidative stress." https://tinyurl.com/37xu4o