This article was originally published on the Marijuana Patients Organization site on April 20, 2012.
Kief is the thichromes (crystals) on the buds, kief hash is simply these crystals compressed together. Many prefer to sprinkle this kief on joints or in their bowl to wrench up the potency of their marijuana.

Great to sprinkle on regs or indica weed to get a mental high, alertness, whatever it helps to keep you awake and going. Use during the day with my kush. The kush gives me the pain relief for my lower back and kief makes me alert. A little sprinkle goes along way.