Because peptides are fragile proteins, taking them orally in a pill form means they will simply be destroyed by your stomach acid before they can work
Their short half-lives mean timing matters: administration is conventionally described around bedtime or after fasting, aiming to align the induced pulse with the body's own nocturnal GH release and to avoid the GH-blunting effect of elevated insulin after meals
Expert Opinion on Therapeutic Targets, 20(10), 12591265
The GHRH signal (sermorelin) tells the pituitary to release GH, while the ghrelin signal (ipamorelin) both adds a second release stimulus and lifts somatostatin's inhibitory brake
Improved pallesthetic sensitivity of pudendal nerve in impotent diabetic patients treated with acetyl-L-carnitine
Skin-whitening and skin-condition-improving effects of topical oxidized glutathione: a double-blind and placebo-controlled clinical trial in healthy women. Clinical, cosmetic and investigational dermatology 7 (2014): 267.