In addition to increases in insulin secretion and synthesis, GLP-1 suppresses Glc secretion, slows gastric emptying, reduces food intake, and promotes beta-cell proliferation
doi: 10.1111/jpi.12274 120 TianXKangXYanFFengLHuoXZhangHet al
Another thing to consider is if someone has an allergy to one of the inactive ingredients found in the brand-name versions
Biosci Biotechnol Biochem 71:20952100 Terpe K (2003) Overview of tag protein fusions: from molecular and biochemical fundamentals to commercial systems
So EGF is a plausible cell-renewal signal with a real mechanism, not a guaranteed pigment shield, and a randomized controlled trial of microneedling combined with topical growth factors did report improvements in skin parameters with no adverse effects, which supports the pairing of needling and growth-factor delivery while stopping well short of overpromising
What is Glutathione and how does it brighten skin