Bio strath bio strath 100 tabletsbio strath tablets are made to a special herbal yeast formula bio strath is a balanced formula derived from the active principles of live herbal yeast which has been treated by a unique biological process producing a herbal yeast complex rich in vital nutrients for many days live active saccharomyces cerevisiae yeast is cultivated on the following wild herbs angelica balm basil caraway chamomile cinnamon elder fennel horseradish hyssop lavender