The Impact of Qualia Vitamin C+ on Blood Vitamin C Levels

This is a randomized, double-blind, placebo-controlled, parallel-group, study evaluating the effect of a Qualia Vitamin C+ formulation on Whole Blood Vitamin C levels in the blood of healthy adults aged 25 years or older. Approximately 36 participants will be randomized to one of two study arms: Qualia Vitamin C+ or placebo. Each participant will take two capsules of their assigned product once daily in the morning, with or without food, over a 28-day period. The primary outcome is the change in blood vitamin C levels, assessed via in lab blood collection at baseline and study completion. Secondary endpoints include questionnaires measuring health-related cognitive functioning and stress (PROMIS Cognitive Function - Short Form 8a and the Perceived Stress Scale-10), the Single-item Assessment of Immune Fitness, evaluation of safety and tolerability, and an Overall Experience Questionnaire (Appendices 1, 4-7). All assessments, including electronic questionnaires, are completed remotely without in-person visits.