Abstract: The method for preparing theragnostic carbon quantum dot nanomedicine composition comprises collecting and processing fresh plant samples of Azadirachta indica; mixing 50 g of crushed dried neem leaves powder with 500 mL of methanol and left to extract for 1 week; filtering the mixture and condensing using a rotary evaporator, and lyophilizing to obtain the extract; dissolving 0.57 g L-cysteine in 10 mL of deionized water and mixing with 1.5 g of citric acid to form a solution; ultrasonicating the solution for 10 minutes and then heating in a microwave oven for 4 minutes; cooling the solution to room temperature and then dissolving in 10 mL of deionized water to obtain a brown solution; centrifuging the brown solution at 9000 rpm for 10 minutes to remove impurities and filtering with a filter; and extracting the Carbon quantum dot (CQD) solution with ethyl acetate and storing in a refrigerator at 4° C.

Abstract: Methods of preparing an extract of Prickly-ash peel, including pulverizing the peels of Chinese Prickly-ash berries to produce powdered Prickly-ash peel; extracting the powdered Prickly-ash peel using an organic solvent to yield an organic extract solution; and removing the organic solvent under reduced pressure to yield a residue that is an extract of Prickly-ash peel. The resulting Prickly-ash peel extracts include the active anti-aging ingredient gx-50, having the formula which may be dispersed in a liquid or semi-solid physiologically and cosmetically acceptable vehicles or carriers to form topical anti-aging cosmetics.