Method for preparing a refined extract of Centella asiatica comprising more than 50 wt.% of a mixture of madecassoside and of terminoloside relative to the total weight of the extract, said method comprising the following steps: a. macerating aerial parts or leaves of the Centella asiatica plant under stirring in water or in a solvent mixture comprising at least water and an alcohol solvent, at a temperature of 20°C to 90°C, for 20 to 180 minutes, in a [ Centella asiatica]:[ solvent mixture] ratio between 1:2 and 1:20; then: filtering the maceration mixture, whereby an aqueous solution is obtained; α. passing the obtained aqueous solution over an absorbent resin capable of absorbing the triterpene heterosides; β. eluting said absorbent resin with an eluent comprising at least 30 wt.% of an alcohol solvent and possibly of water, whereby an eluate is obtained; then: treating the obtained eluate with active carbon; b. passing the treated eluate over a discolouring resin of the strong anionic styrene-chloride type, then treating by successive passage(s) over a strong cationic ion exchanging resin comprising functional groups of the sulphonate type, then over a strong anionic ion resin comprising functional groups of the quaternary ammonium type or passing the eluate over said mixed resins, whereby a discoloured aqueous phase is obtained; c. vacuum-concentrating the discoloured aqueous phase using tangential filtration membrane techniques any organic or mineral membrane by using media having a cut-off threshold between 200 Da and 100 kDA, whereby an extract is obtained; then: recrystallising the obtained extract by: d. solubising the obtained extract in a solvent mixture comprising water and an alcohol solvent brought to a temperature of 40°C to 70°C, whereby a solution is obtained; e. slowly and gradually reducing the temperature for 1 to 250 hours to a cooled mixture temperature between -20°C and 30°C, whereby a cooled mixture is obtained; f. filtering the cooled mixture, whereby a filtrate is obtained; g. concentrating the filtrate by distillation, whereby a refined extract is obtained comprising less than 15 wt.% of asiatocisode relative to the total weight of the extract. a. macerating aerial parts or leaves of the Centella asiatica plant under stirring in water or in a solvent mixture comprising at least water and an alcohol solvent, at a temperature of 20°C to 90°C, for 20 to 180 minutes, in a [ Centella asiatica]:[ solvent mixture] ratio between 1:2 and 1:20; then: filtering the maceration mixture, whereby an aqueous solution is obtained; filtering the maceration mixture, whereby an aqueous solution is obtained; α. passing the obtained aqueous solution over an absorbent resin capable of absorbing the triterpene heterosides; β. eluting said absorbent resin with an eluent comprising at least 30 wt.% of an alcohol solvent and possibly of water, whereby an eluate is obtained; then: treating the obtained eluate with active carbon; b. passing the treated eluate over a discolouring resin of the strong anionic styrene-chloride type, then treating by successive passage(s) over a strong cationic ion exchanging resin comprising functional groups of the sulphonate type, then over a strong anionic ion resin comprising functional groups of the quaternary ammonium type or passing the eluate over said mixed resins, whereby a discoloured aqueous phase is obtained; c. vacuum-concentrating the discoloured aqueous phase using tangential filtration membrane techniques any organic or mineral membrane by using media having a cut-off threshold between 200 Da and 100 kDA, whereby an extract is obtained; then: recrystallising the obtained extract by: recrystallising the obtained extract by: d. solubising the obtained extract in a solvent mixture comprising water and an alcohol solvent brought to a temperature of 40°C to 70°C, whereby a solution is obtained; e. slowly and gradually reducing the temperature for 1 to 250 hours to a cooled mixture temperature between -20°C and 30°C, whereby a cooled mixture is obtained; f. filtering the cooled mixture, whereby a filtrate is obtained; g. concentrating the filtrate by distillation, whereby a refined extract is obtained comprising less than 15 wt.% of asiatocisode relative to the total weight of the extract.