A hair treatment agent composition is disclosed comprising； (a) 0.00001 to 20% by weight, based on the total weight of the hair treatment agent, of at least one proteolipid of the formula (I) below R'-X-R" (I) where R', X and R are as defined therein and； (b) 0.01 to 5.0% by weight, based on the total weight of the hair treatment agent, of magnesium citrate in a water-containing carrier, the composition having a pH of between 3.5 and 5.5. Such compositions exhibit an increased positive effect on the hair and the hair follicle with improved colour protection performance in artificially produced hair colours.
