Stem and vein kratom are said to have a lower concentration of mitragynine and 7-hydroxymitragynine. Furthermore, many long-term kratom users believe that Stem and Vein cannot be used in place of traditional products such as kratom powder. <br>Instead, users interested in Stem and Vein should use it as a kratom potentiator, which is a supplement that can enhance the overall effects of traditional kratom products. It is entirely possible that combining these two kratom varieties will enhance the effects you experience.