If you had to pick one: GHK-Cu has broader biological reach (roughly 4,000 genes modulated versus 300-500 for retinol) [3] and a higher responder rate for collagen improvement in the only direct comparison
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This has been attributed to seleniums ability to reduce DNA damage and oxidative stress, boost your immune system, and destroy cancer cells ( A review of 69 studies that included over 350,000 people found that having a high blood level of selenium was associated with a lower risk of certain types of cancer, including breast, lung, colon, and prostate cancers ( Its important to note that this effect was only associated with selenium obtained through foods, not supplements
For microdosing, the 2ml reconstitution is clearly superior
Vitamin C is abundant in fruits and vegetables - and easy to get daily from: Sleep is an important commodity in every person's life
At higher doses, it is also absorbed by passive diffusion across the gut wall, independently of intrinsic factor