For Centuries The Dark Berries of European Black Elder (Sambucus Nigra L. ) Have Been Traditionally Used As A Winter Remedy For Immune Support. * Nature’s Way Standardized Sambucus is The Superior Black Elderberry Extract. Premium Elderberries: Made With Our Unique, Full-Spectrum Black Elderberry Extract That is From A Unique Blend of Black Elderberries That Are Naturally Richer in Flavonoid Bioactives. Superior Quality: Our Elderberry Extract Has Been Tested For Bioavailability And Shown To Be Active Within The Body. Product is Made With A Gentle, Solvent-Free Extraction Method That Ensures Maximum Flavonoid Potency.