Abstract
This chapter highlights researches about the use of marine structures in the cosmetic area. In the last years, products containing algae compounds have been used to repair damages in both skin and hair. Algae species with wide distribution and valuable chemical composition have high potential as natural sources of biologically active ingredients. These substances comprise many different types and vary according to their final application, either on the skin or on the hair. In skincare, for example, studies showed that these ingredients can be used in successful formulations against premature skin aging, sunscreens, and moisturizer, among others. The most commonly known ingredients in skincare cosmetics are pigments (i.e., chlorophylls, carotenoids), carbohydrates (e.g., agar, alginate, carrageenan, fucoidan, and polysaccharides, among others), nutritional supplements (polyunsaturated fatty acids), proteins, and lipids. In haircare, studies also showed promising results in scalp care mainly. Formulations containing proteins, essential amino acids, and polyunsaturated fatty acids; carbohydrates; vitamins and minerals (magnesium and calcium); alginates, agar, and carrageenans (polysaccharides); phytosterols and polyphenols are among the most frequents in cosmetics.
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