Regardless of the type of green vein kratom in question, this is a question that’s quite difficult to generalize. The precise levels of the alkaloid mitragynine will vary significantly from strain to strain, and sometimes even from batch to batch (based on farming and seasonal conditions). This is yet another reason why it’s so important to make sure that the kratom vendor you choose can supply comprehensive Certificates of Analysis, which prove both the batch’s purity and its alkaloid potency.
In general, however, green kratom strains have a balance between mitragynine and 7-hydroxymitragynine, the two alkaloids most responsible for kratom’s unique effects. That’s because green kratom is made from kratom leaf harvested at the midpoint in its maturation cycle. As kratom plants mature, the alkaloid balance shifts and, in turn, the color of the veins change. Because they are harvested at the midpoint, green vein kratom leaves tend to have a balance between kratom’s two active alkaloids.