Bio-Strath Tablets are made exclusively from natural raw ingredients and are free from artificial colours, flavours, preservatives and synthetic substances. Bio-Strath Food Supplements are based on a nutritional yeast called Saccharomyces cerevisiae. This yeast has long been recognised for its immune and digestive system enhancing properties and for its rich source of natural B-vitamins.IngredientsThe Vitamin B, content corresponds to 45% of nutrient refernce Values