Back in Stock: Kratom Stem & Vein Powder Kratom Stem & Vein Powder: Our  S&V aka SnV or Kratom Stem & Vein powder is comprised of 100% Stem and Vein pieces. DETAILS: To be clear, when grinding the leaves, the soft leaf matter (aka the Lamina or Leaf Blade ) is separated from the stem & vein pieces. The stems/veins are much coarser and yield a different set of alkaloids vs the Leaf Blade (Lamina). This product has often been hailed as a refreshing & resetting agent in relation to kratom leaf tolerance. It is also considered a partial kratom alternative .