Pretorius Professional Pro Biotic Forte Pretorius PRO Biotic Forte contains four shelf stable strains of probiotics. These strains may assist in maintaining a normal healthy immune system and may reduce the occurrence of flatulence, bloating, constipation and diarrhoea. Pretorius PRO Biotic Forte may assist in restoring beneficial intestinal bacteria, especially useful after balance is upset with poor diet, antibiotic use and lifestyle factors.