A method for carnosic acid, carnosol and rosmarinic acid isolation, comprising the sequential steps of 1) Extraction of deoiled rosemary (A) using ultrasonic water bath at 60°C for 20 min with a 50% ethanol:water (v:v) solution, 2) Filtration (B) of the extract of step (A) by vacuum filtration and the filtered liquid extract is filtered for a second time using a fine filter with 1-5 micrometer pore diameter, 3) Passing deionized water as a mobile phase through a macro-porous adsorbent-containing column (C) and the eluent from the column goes to waste, 4) Feeding the filtered liquid extract into the conditioned column in an amount of 0.01 to 5 times of the column volume, and observing the eluent which goes to waste at 284nm wavelength, then passing deionized water as mobile phase through the column and this part goes to waste, 5) Passing a 50% ethanol-water solution through the column as mobile phase, 6) Collection of eluent corresponding to liquid extract containing rosmarinic acid, 7) Evaporation-1 (D) of ethanol in the eluate of step 6, containing rosmarinic acid, either under vacuum in rotary evaporator, lyophilizer, vacuum dryer, vacuum oven or spray dryer, 8) Freeze drying (lyophilizing) (E) of the remaining aqueous part and obtainment of deodorized rosmarinic acid, 9) Passing a 99% ethanol through the column as mobile phase, 10) Collection of the eluent of step 9, liquid extract containing carnosic acid and carnosol, 11) Evaporation-2 (F) of ethanol in the eluate of step 10, containing carnosic acid and carnosol either under vacuum in rotary evaporator at 40 °C, until it dries completely and obtainment of deodorized carnosic acid and carnosol, 1) Extraction of deoiled rosemary (A) using ultrasonic water bath at 60°C for 20 min with a 50% ethanol:water (v:v) solution, 2) Filtration (B) of the extract of step (A) by vacuum filtration and the filtered liquid extract is filtered for a second time using a fine filter with 1-5 micrometer pore diameter, 3) Passing deionized water as a mobile phase through a macro-porous adsorbent-containing column (C) and the eluent from the column goes to waste, 4) Feeding the filtered liquid extract into the conditioned column in an amount of 0.01 to 5 times of the column volume, and observing the eluent which goes to waste at 284nm wavelength, then passing deionized water as mobile phase through the column and this part goes to waste, 5) Passing a 50% ethanol-water solution through the column as mobile phase, 6) Collection of eluent corresponding to liquid extract containing rosmarinic acid, 7) Evaporation-1 (D) of ethanol in the eluate of step 6, containing rosmarinic acid, either under vacuum in rotary evaporator, lyophilizer, vacuum dryer, vacuum oven or spray dryer, 8) Freeze drying (lyophilizing) (E) of the remaining aqueous part and obtainment of deodorized rosmarinic acid, 9) Passing a 99% ethanol through the column as mobile phase, 10) Collection of the eluent of step 9, liquid extract containing carnosic acid and carnosol, 11) Evaporation-2 (F) of ethanol in the eluate of step 10, containing carnosic acid and carnosol either under vacuum in rotary evaporator at 40 °C, until it dries completely and obtainment of deodorized carnosic acid and carnosol, <EOS>