Hello Ning~
Much appreciate all your efforts in researching the many types and brands of collagen supplements. I have used a few...and finally found Codeage....I am very pleased with the ingredients and the wide scope of the types needed. It's also affordable..as it has 63 servings for under 40.00 a container. I'm using the unflavored one..it dissolves in hot coffee..so I'm a happy camper. It's made in the US...I was using Vital Proteins..which I liked..but was only doing 1/2 of the recommended amounts daily...but still saw dramatic results! Old age spots disappearing on the back of my hands..my face wrinkles have been reduced..generally better hair strength as well as nails....and it only contained 3 types of collagen...so I'm hoping for even better results from using Codeage.
Best to you all.....