Probiotics
are to replace friendly bacteria in the stomach needed for digestion for those taking antibiotics which unfortunately kill both friendly bacteria as well as bad bacteria, for medium to mild stomach problems, for problems like gas, bloating, intestinal toxicity, constipation, gastric discomfort and malabsorption of nutrients

21st Century Probiotics contains
8 billion
“friendly bacteria” of four types :

1.Lactobacillus Acidophilus - 2 Billion
2.Lactobacillus Salivarius - 2 Billion
3.Bifidobacterium Bifidum - 2 Billion
4.Streptococcus Thermophilus - 2 Billion.