Histology of pancreas and testis tissues derived from rats treated with 10 doses of PLGA or PLGA–GA nanosystems. No major histological abnormalities were seen in both the tissues. In the pancreas, yellow arrows show intact pancreatic “islets”, and the number of islets is insignificant between both the treatment groups suggesting PLGA–GA is safe. In testis, the absence of obvious changes such as cytoplasmic vacuolation, necrosis, apoptosis, and atrophy indicates PLGA–GA particles are safe.