But the mechanism matters
"Endocrine activities of ghrelin, a natural growth hormone secretagogue (GHS), in humans: comparison and interactions with hexarelin, a nonnatural peptidyl GHS, and GH-releasing hormone." J Clin Endocrinol Metab
While leucine is widely available in food sources, taking a concentrated dose of it in something like BCAA or EAA supplements means you're getting a pure dose of the essential amino acids, which theoretically should mean greater availability to support muscle building, muscle growth, and recovery directly
Taking your blood sample at 9am provides a consistent baseline, making it easier to compare results over time and ensuring they align with the standard reference ranges used by doctors
A 2018 rat study showed that it increased GH receptor expression in tendon cells and activated key growth pathways, making tissues more responsive to circulating GH