In people

A single dose raises growth hormone sharply within 15 to 60 minutes, which is why Japan uses it as a pituitary test. In healthy men, meals got about a third larger on GHRP-2. People using it before bed report deep sleep, and before meals report hunger. Over weeks, recovery speeds up and IGF-1 rises. Men who used a GHRP-2, GHRP-6 and sermorelin combination saw IGF-1 climb steadily over months.