O.P.M.S. Silver Thai Kratom Pre-capsulized Thai Kratom. O.P.M.S. Silver Thai Kratom uses only the rarest white vein Kratom from Thailand. Unlike other strains of Kratom, O.P.M.S. Silver Thai Kratom is quite unique in that it delivers more of an energy, memory and mood boost. The reason is due to a different alkaloid profile. Specifically, higher levels of mitragynine are found in white vein strains. This means ample energy, enhanced cognitive function and mood enhancement. If your energy level is always low, or if you’re suffering from depression and fatigue, O.P.M.S. Silver Thai Kratom is the right choice for you. A 100% natural way to boost your memory and cognitive skills.