December 2023 in “International Journal of Newgen Research in Pharmacy & Healthcare” This study evaluated the physicochemical characteristics, safety, and efficacy of six herbal and six synthetic shampoos and found that all products performed well in various tests, with no skin irritancy observed, suggesting that both types can be considered safe for use.
October 2025 in “International Journal of Research and Review” This study highlights the potential benefits of herbal soaps and shampoo bars as eco-friendly alternatives to conventional cosmetics, noting their antibacterial, antifungal, and antioxidant properties as well as sustainability advantages such as reduced plastic use and avoidance of synthetic chemicals.
July 2026 in “International Journal of Drug Delivery Technology” 
10 citations
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June 2001 in “International Journal of Cosmetic Science” This study found that laboratory-formulated natural shampoos condition hair better than commercial herbal shampoos, as shown by SEM micrograph analysis of hair microstructure.
9 citations
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January 2020 in “Research Journal of Topical and Cosmetic Sciences” This study concluded that a formulated herbal shampoo outperformed synthetic counterparts in detergency and maintaining a shiny, oily hair appearance, suggesting it could be a better alternative due to fewer harmful effects like hair dryness and keratin loss.