GHRP-6 is one of the earliest growth hormone releasing peptides and works through the ghrelin receptor. Its most consistent, reproducible and well documented effect is a substantial increase in hunger, which follows logically from mimicking the hormone your body releases when your stomach is empty. This is rarely the headline in marketing material, where it is presented as a lean-mass compound. The growth hormone release it produces is real and measurable, but no completed trial has shown that this translates into meaningful changes in muscle, fat or performance. It was investigated decades ago, never approved for consumer use, and now circulates as a research chemical.