Personally, I think GHK-Cu has the most proven benefits and it’s super cheap compared to pre mixed Glow. BPC-157 can help influence collagen production but if your diet isn’t right it is wasted. TB-500 can influence tumor progression. For me it’s not worth the risk, especially if you have a familial history.
You can get GHK-Cu and BPC-157 and mix it yourself if you are dead set on it, but I think taking GHK-Cu and consuming Bovine Collagen is the safer, more proven route. With EITHER Glow or GHK-Cu, make sure you are taking Zinc to avoid Copper Toxicity.
I am a fan of Glutathione for skin and its added benefits to liver health and its ability to remove free radicals from your body. You just need to make sure you are taking Ascorbic Acid (Vitamin C) and Vitamin E with it