There are continually sought strains of bacteria that exhibit desirable technological features and are able to help improve physical-chemical and rheological characteristics of food products, and which, at the same time, can have health-promoting effects. The objectives of the research study were: to characterize acid curds produced as a result of the milk fermentation process conducted with the participation of Lactobacillus helveticus, to compare the sensitivity of the bacteria analyzed to bile salts present in the growth medium, and to determine the effect of fermentation process run with the participation of the microbes studied on the antiradical properties of the selected milk protein preparation. Based on the analyses performed, it was shown that the bacterial strains analyzed differed in terms of their sensitivity to bile salts present in the growth medium. That component added to the culture medium in an amount of 0.25% caused the growth dynamics of all the tested microorganisms to be inhibited. The Lb. helveticus T80 and T15 strains were the most sensitive to this component; the T105 strain showed the highest resistance. The antiradical activity of α-lactalbumin at a level of 15.4% increased significantly after the fermentation process. Depending on the bacterial strain used, that level ranged between 45.1 and 75.3%. In the samples fermented with the use of bacteria from the Polish collection, the Lb. helveticus 80 strain showed the highest antiradical activity (63.4%).The T104 and T105 strains exhibited the highest technological suitability in terms of the ability to produce the hardest homogeneous acid curds. The hardness of the gels produced with the participation of those strains was 0.275 N and 0.316 N, respectively.