This is a list of products that I believe help to tighten skin. Some of them can also increase collagen production. I'm sorry, but I don't believe that the following products work. The following products claim to tighten skin, but I'm not sure they work. I am not sure why they don't work. The only product that I found that claims to tighten skin is L'Oreal's Powder for the Under Armour Foundation. (The formula is not the same as the L'Oreal's product. I've never tried this product and don't recommend it. I have read reports that it works, but I have not tested it. I don't know if it is safe to use it for a specific reason.) It says on the label that it can "tighten skin." I think that this is just a marketing term. But I'm sure it is. I'm sure you can tighten your skin in a variety of ways, and I hope that L'Oreal has been testing the product. There are many people who buy products for tightening their skin, and don't know which ones really work. (I don't know if this is a real medical product. I am not a medical doctor. But I am a dermatologist, and I know that the skin of the eyelids is really tight. I don't know what causes that.