323 citations
,
  April 2006   in “The journal of investigative dermatology/Journal of investigative dermatology”    Only 40 nm nanoparticles can enter skin cells effectively for potential vaccine delivery.  
               181 citations
,
  July 2004   in “Journal of controlled release”    Smaller nanoparticles improve minoxidil absorption through hair follicles.  
     
           151 citations
,
  November 2018   in “International Journal of Pharmaceutics”    Nanoparticles improve drug delivery through the skin but more research is needed on their long-term effects and skin penetration challenges.  
     
           130 citations
,
  August 2020   in “Drug Design Development and Therapy”    Nanoparticles can improve skin drug delivery but have challenges like toxicity and stability that need more research.  
     
           96 citations
,
  September 2021   in “International Journal of Molecular Sciences”    Chitosan, a natural substance, can be used to create tiny particles that effectively deliver various types of drugs, but more work is needed to improve stability and control of drug release.