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Solaray Nutraflora Fos 770 mg 60 Capsule - NutraFlora? FOS is 100% pure, all natural fructooligosaccharides. FOS is a naturally occurring carbohydrate and has been clinically shown to selectively enhance and promote the growth of "friendly" bifido and lactobacillus bacteria within the intestinal tract. NutraFlora? FOS does NOT require refrig.