Due to different growth regions and breeding, kratom has evolved into a variety of different strains, which can be very different in effects. There are three primary effect categories one can divide strains into: stimulating, sedating and moderate.
It should be noted that every plants within a strain can vary, so in no way are these analyses set in stone, rather they based upon an average of verifiable user reports to provide a guide to the strain as a whole.
Red veins are more mature and have distinctive red veins on the backside of the leaf. Red vein tends towards a higher level of 7-hydroxy mitragynine which leads to sedation, pain relief and reduced anxiety and stress. Most Strains of red vein do not produce a stimulating effect although there are exceptions such as Red Maeng Da. Reds tend to be the most popular strains ordered due to their overall higher strength.
White Veins are the fastest growing strains with white veins on the underside of the leaves. Great for energy, focus and mood lifting and relief from symptoms of depression. White vein shows nootropic (cognitive enhancing) effects and makes a great substitute for coffee
Green Veins are more moderate strains with green veins on the underside of their leaves. For an effect that is neither red, nor white but with elements of both green is a great option. Green strains are known to be far less at the whim of individuals brain chemistry and thus produce more predictable and constant effects. Green strains show nootropic (cognitive enhancing) effects as well as improvement in mood and a level of pain killing effects.