285MELANIN: NATURE'S MULTIFACETED MARVEL AND ITS DIVERSE APPLICATIONS- A REVIEWMelanin, a biopolymer naturally synthesized within melanosomes, undergoes transportation to neighboring keratinocytes where it accumulates. Serving as a natural shield against UV radiation, melanin is primarily produced by neural crest melanocytes, forming supranuclear caps around the perinuclear region to safeguard DNA from harmful ultraviolet rays. Over the past few decades, melanin has garnered increased attention in research and development, finding applications in diverse fields such as organic semiconductors, bio-electronics, photo-protection, photo-acoustic imaging, and nanoparticle drug delivery. Synthetic melanin nanoparticles (MNPs) offer a broad spectrum of UV-Vis absorption. Natural MNPs, aside from their numerous applications, also showcase a variety of uses. Computational modeling methods are employed to optimize nanostructures. This review delves into the properties, types, and bio-origin of melanin, addressing hypopigmentation and hyperpigmentation while providing insights into their management. Furthermore, it explores melanin's physiological functions across various biological domains, encompassing antioxidant effects, radio protective effects, sun screening effects, immunomodulation enhancements, and hepatoprotectiondrkappa@gmail.comResearch1322023 Melanin, UV-Protection, Anti-oxidants, Biosynthesis, TherapyElakiya R, Elamathi V,Karpagam Kumara Sundari S,Senthamarai RDepartment of Pharmacology, Periyar College of Pharmaceutical Sciences, Trichy, Tamil Nadu, India,Dean, Periyar College of Pharmaceutical Sciences, Trichy, Tamil Nadu, India,Principal, Periyar College of Pharmaceutical Sciences, Trichy, Tamil Nadu, India