Evidence Level
Meso-Zeaxanthin is a carotenoid that plays a critical role in eye health and cognitive function. Research from the CREST studies demonstrated that a three-carotenoid formula, including meso-zeaxanthin, significantly increased macular pigment optical density (MPOD) compared to two-carotenoid formulas. Nolan et al. (2016) found that this triple formulation improved contrast sensitivity and visual performance in patients with age-related macular degeneration (AMD). Additionally, a 2016 meta-analysis by Ma et al. involving 938 AMD patients and 826 healthy subjects confirmed that supplementation with lutein, zeaxanthin, and meso-zeaxanthin significantly enhances MPOD levels.
Beyond its role in eye health, meso-zeaxanthin has been shown to have broader benefits. A systematic review by García-Romera et al. (2022) of 19 studies highlighted that higher dietary intake of lutein and zeaxanthin improves cognitive functions such as memory, processing speed, attention, and reasoning in adults. Furthermore, Stringham et al. (2024) reported that supplementation with these carotenoids reduces inflammatory cytokines (IL-1β and TNF-α) and oxidized LDL, suggesting potential cardiovascular benefits.
In the context of cognitive health, Power et al. (2022) conducted a randomized clinical trial involving 60 older adults and found that a combination of omega-3 fatty acids, carotenoids, and vitamin E improved working memory over 24 months. Similarly, Nolan et al. (2022) demonstrated in a study of 77 mild-moderate Alzheimer's disease patients that daily supplementation with carotenoids, omega-3s, and vitamin E not only slowed disease progression but also enhanced skin and blood nutrient levels.
Overall, meso-zeaxanthin is increasingly recognized as an essential component of comprehensive macular and cognitive supplementation, supported by robust evidence from multiple clinical trials.