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Guaranteed Potency10% Vegetal Silica from Springtime HorsetailAn Herbal SupplementWorld Organic Silica 500 contains the highest potency of actual Silica of any leading brand. Our special formulation combines the whole herb with all of the naturally occurring flavones found in springtime horsetail herb as well an extra high potency extract to provide a balanced source of vegetal Silica. In the human body silica is found in the hair nails and bones.