Abstract
Cosmetic formulations have evolved significantly over the years. These are no longer viewed merely as beauty-enhancing products. Rather, they are expected to deliver additional benefits to the skin that positively affect the skin health. There is a renewed interest in using herbal extracts and herbal ingredients in cosmetic products since they offer several advantages over synthetic ingredients. Evaluating the cosmetic ingredients for their efficacy and safety is critical during product development. Several regulatory bodies impose restrictions on using animals for testing these ingredients in cosmetic products. This has increased the need for developing novel cell-based or cell-free biological assays. The current article systematically presents in-vitro/cell-based and/or cell-free strategies for validating the efficacies of cosmetic ingredients for skin health and hair growth. The article focuses on details about various assays for the anti-acne effects, hair-growth-promoting activities, anti-aging activities, skin-rejuvenating properties, wound-healing effects, and skin-depigmentation activities of natural ingredients in cosmetic formulations.
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