Progression in genetic engineering has led to proliferation of a wide variety of proteins, peptides, genes, and other macromolecules
Enormous efforts are being made to formulate these bioactives into patient-friendly system using the approaches of novel drug delivery systems mainly based on liposomes, nanocapsules, nanoemulsions, niosomes, hydrogels, nanoparticles, and bioadhesive particles
Among these nano size carriers attract huge intention because at this size surface area enhances exponentially which surprisingly changes the many aspects compared to conventional particles
This chapter describes challenges and restrictions for the delivery of bioactives, and selection of nanocarriers such as nanoparticles and liposomes to achieve the desired response at the site of action and other carriers can enhance the pharmacokinetic behavior of bioactives, minimizing toxic effects and make the most of the therapeutic benefits
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