Buckthorn Bark Extract Powder by Bulksupplements (100 grams) Go to amazon.com Related posts Top 10 recommendation buckthorn bark 2022 FeatureClean & pure 10:1 extract. No fillers.Lab tested for verification & guaranteed purityFactory-sealed foil zip pouchGentle & natural laxative DescriptionPure Buckthorn (Frangula alnus) Bark Extract 10:1 powder.