Effects of an Antioxidant Supplement on Blood Vessel Health

Inclusion Criteria: * Self-identify as either non-Hispanic Black or non-Hispanic White. * Men and women 18-75 years old. * Non-hypertensive (systolic blood pressure \[SBP\]\<130 and diastolic blood pressure \[DBP\] \<85 mmHg). * Have low density lipoprotein cholesterol \<150mg/dl. * Have HbA1C \<6.0%. Exclusion Criteria: * Rash, skin disease, or disorders of pigmentation (e.g., psoriasis, eczema, vitiligo, or other skin inflammatory skin disorders) * Known skin allergies to latex or adhesives * Smoking and/or use of nicotine-containing products within the past year * Use of illegal/recreational drugs * Generalized kidney disease * Taking chloramphenicol, cholestyramine, medication for seizures, methotrexate, nitrofurantoin, tetracycline, barbiturates, steroids, phenobarbital/phenytoin, orlistat or pyrimethamine * Any current medications which could conceivably alter the cardiovascular control or responses * Diagnosed or suspected metabolic or cardiovascular disease * Current pregnancy or breastfeeding * History of skin or other cancers * Diagnosed or suspected diabetes (HbA1c ≥6.0) * Anybody with narcolepsy or who has been diagnosed with any condition that impairs body temperature regulation.