Herbal nanosponges are nanoscale porous carriers that enhance the solubility and therapeutic efficiency of plant-derived bioactives. Among several formulation variables, the choice of crosslinker plays a decisive role in determining biodegradation, immune response, and overall safety. Although most studies focus on drug loading and release kinetics, relatively few have addressed their long-term or immunological safety.This review summarizes and compares the toxicity profiles of widely used crosslinkers-diphenyl carbonate (DPC), carbonyldiimidazole (CDI), citric acid, and glutaraldehyde-drawing attention to data gaps and safety concerns. Finally, a structured toxicity-testing framework is proposed to promote safer, biocompatible, and sustainable crosslinker choices for herbal nanosponge systems.
Nanosponges, Crosslinker toxicity, Biocompatibility, Herbal drug delivery, Immunogenicity, Chronic exposure.
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