However, as already referred, from 2 to 5% of O 2 is reduced only 1 electron, and this one is going to occupy one of the external orbitals, at the same time that the other keeps not matched, producing intermediaries highly reactive, called Reactive Oxygen Especies, that sometimes constitute the free radicals
TCA cycle and mitochondrial membrane potential are necessary for diverse biological functions
Other (less serious) concerns are if EGF can properly penetrate the skin (as it is a medium-sized, polar molecule, so a special delivery system is probably needed), if it can affect collagen synthesis (or just works on the surface plumping up only the upmost layers of the skin) and if it has beneficial effects at all when used in isolation versus when used in a "conditioned media" that contains lots of growth factors resembling the synergistic balance found in the skin
Sermorelin is typically administered at night to coincide with peaks of GH levels
It also increases HUVECs proliferation by stimulating VEGF and FGF-2 expressions, promoting angiogenesis that aids in wound healing [7]
J Agric Food Chem 65:31603166