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PMID: 265572 Monnier M, et al

The arginine salt is generally preferred in research for its improved solution stability, particularly at physiological pH ranges

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The data are scientific and informational in nature

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