GHRH/GHRP (they work synergistically) causes your body to release GH. And what’s even better, it does in a pulsatile fashion; mimicking the body's natural cycle of GH release. I have found that when quality peptides are administered in the correct dose, & at the correct time, you will notice healing occurring very quickly (within days, even on old injuries).

So, yes GHRH/GHRP do have the same — or better — benefits as GH.

GHRP-6 is the answer to your question.

quoted from thinksteroids

Benefits of increased Growth Hormone levels through GHRP-6 stimulation include: an increase in strength, muscle mass and body fat loss, rejuvenation and strengthening of joints, connective tissue and bone mass. Enhanced GH secretion also leads to the liver secreting more IGF-1 (Insulin-Like Growth Factor 1), which is thought to be the primary anabolic mechanism of action for Growth Hormone.