The impact of alimentary supplement, homeopaticum and probioticum on selected blood parameters was examined in dairy calves. The effect of algae alimentary supplement on nitrogen metabolism was indicated by its decrease of urea in blood (P < 0.05). The beneficial effect of homeopaticum on health of calves was indicated by the levels of hemoglobin, leukocytes, glucose and protein in blood (P < 0.05). No effect of probioticum on mentioned blood health parameters was identified (P > 0.05).