Neuroprotective effect of phytoconstituents via nanotechnology for treatment of Alzheimer diseases.

Alzheimer's disease (AD) is a neurological condition characterised by cognitive and behavioural dysfunction. The presence of the blood brain barrier (BBB), which prevents medications from entering the brain, makes treating AD difficult. Currently, existing therapeutic modalities provide symptomatic alleviation while also being unsafe. Phytoconstituents are gaining popularity due to their neuroprotective properties and ability to target many pathogenic pathways involved with AD. However, because to their lower BBB permeability, poor solubility, and low bioavailability, they have failed to reduce disease progression and treat Alzheimer's disease. Nanotechnology is an emerging tool for overcoming these obstacles in brain drug delivery. Thus, the development of phytochemical-loaded nanocarrier systems can reduce these barriers while improving neuroprotective benefits. In this review, we summarised prospective targets, methodologies for brain drug delivery, phytoconstituents, and their nanocarrier system developed for the management and treatment of AD. Researchers looking for an alternate method to treat AD were given new insight by emphasising obstacles and future prospects.