The emergence of nanotechnology has been an interesting innovation in this current age which is permeating rapidly into the various fields such as medicine, materials science, pharmacy, environmental protection, agriculture. Consequently, the high reactivity of these compounds is of great concern as there is more interaction with humans, biological and environmental elements of the ecosystem. However, there is limited knowledge on the risk and toxicity assessment of these nanomaterials. This review explores studies on the modes of contact and the possible damage to the human body system. It also suggests feasible procedures that can be deployed to assess the toxicity and the synthesis of nanoparticles/nanomaterials from biological origin (green synthesis) frequently.

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