Maeng Da Thai Kratom powder (green vein) is one of the more popular strains out there and with good reason why. It has all the good characteristics you would want in a green. A great choice for the kratom user who is on the go, giving you that extra push to get you through the day. Also known as the working man’s strain, this almost speaks for itself. It (green vein MD) originates in Thailand where the farms are filled with hard workers that desired to use this as an herbal enhancement to get them through their long work days. Its effects can last up to 8 hours so that makes it ideal for someone who is on the go and working all day.