Galangal powder has a flavor that is tart, with a slight heat and a citrus aroma that has a bit of a bite to it. Some say it even has a little bit of a cinnamon flavor. This is the more intense cousin of ginger.
It has a 0.5-1.5% essential oil content, mainly comprised of 1,8-cineol.
Galangal and ginger look so similar it is not hard to confuse the two from sight alone, which makes it an easy mistake to make if you are in the grocery store and you happen to pick up the former instead of the latter. Galangal flesh tends to be a little darker, but it has a similar shape to ginger. Their main difference is how flavorful they are, with galangal being much more intense than ginger.