Skin Aging and Carotenoids: A Systematic Review of Their Multifaceted Protective Mechanisms.

Skin aging is a complex biological process influenced by intrinsic factorssuch as genetic predispositions and hormonal changes as well as extrinsic factors including ultraviolet radiation, environmental pollution, and lifestyle habits. This process culminates in a progressive decline in the structural and functional integrity of the skin. This review delves into the protective roles of carotenoids, highlighting their significant anti-oxidative, anti-inflammatory, and photoprotective properties. We included studies that investigated the effects of dietary or topical carotenoids on skin aging markers in human and animal models. Eligible studies were identified through searches of PubMed, Scopus, Web of Science, Embase, Google Scholar, and the Cochrane Library from January 2000 to March 2025. Risk of bias was assessed using the Cochrane RoB tool for randomized trials and animal studies. A total of 176 studies were included, and data were synthesized narratively due to heterogeneity in study designs and outcomes. The findings indicate that carotenoids mitigate oxidative stress-induced cellular damage by scavenging reactive oxygen species (ROS) and Reactive Nitrogen Species (RNS), attenuating chronic inflammation, and enhancing dermal matrix integrity via collagen biosynthesis and modulation of matrix metalloproteinases. Additionally, they support skin hydration and elasticity by indirectly regulating aquaporins and promoting hyaluronic acid synthesis. This review further explores emerging strategies that incorporate carotenoid supplementation in lifestyle medicine and preventive dermatology. By elucidating the cellular pathways through which carotenoids exert their effects and modulate mitochondrial function, this review highlights their translational potential in anti-aging skincare. Ongoing research is essential to comprehend the complex connections between carotenoids, skin physiology, and overall health. This understanding will ultimately facilitate the creation of personalized nutritional and dermocosmetic strategies.