NEW O.P.M.S. Silver Green Vein based Kratom Capsules O.P.M.S. is known as one of the best in quality and is considered king of Kratom and is a leading brand of kratom extract capsules. It comes in various capsule counts and in 3 different strains – Maeng Da, Thai & Malay. The farmers hand pick only the very best for this special blend. Malay Kratom contains some of the strongest alkaloids found in nature. This includes the alkaloids known specifically for analgesic effects, 7-Hydroxymitragynine and Mitragynine. This is why it’s such a popular blend, and a potent pain-reliever. Malay strain is known as one of the best strains to treat chronic pain. Kratom is known for it’s pain-reducing effects, sleep-aid, anti-diarrhea medicine and it can help reduce opium addiction.