May 2026 in “Pharmacy Reports” This systematic review found that while green solvent- and natural excipient-based semisolid formulations often show promising efficacy and safety compared to conventional options, the evidence does not currently establish superior stability, highlighting a need for further research on long-term formulation quality.
April 2026 in “Lithuanian University of Health Sciences” In this study, cinnamic acid in solution form showed strong antifungal activity against Microsporum canis, but when incorporated into hydrogels, the acid's diffusion and resulting antifungal performance decreased, though it maintained effectiveness for potential prolonged exposure.
9 citations
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January 2010 This study reports that a 100% herbal hair dye composed primarily of Cymphomandra betacea, Tagetes erecta, and Aloe vera gel provides permanent hair color without causing hair damage, loss, or skin irritation compared to synthetic dyes.
188 citations
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October 2012 in “The AAPS Journal” This review discusses strategies for developing semi-solid topical generic products to match the quality of reference-listed drugs, using concepts like quality by design and reverse-engineering, but reports no new results.
This study determined that the optimal formulation for caffeine-based hydrogels involves 0.2% caffeine and 2.3% chitosan, based on gel liberation and stability testing.