The chart below shows that the scalp hair has the longest growth cycle of any hair on the body. That makes it the best hair for hair transplant. Beard comes in as a close second, but may not last as long for a growth cycle. Chest and hair on your back are very poor with a growth cycle such that only 30% of the hairs will be growinh at any one time. This is important information for those of you who have run out of scalp hair, and need hair from other sources. It is not good news