Yes, there are probably 100's of collagen products out there and have no idea if any others are amino acid based. I just read about every 94 reviews on iherb and didn't find a negative one. I may have missed some, but read a lot. Read many of the 1500+ on amazon and 95% positive, there will be negative comments no matter what.

My neighbor called a little while ago in almost tears of joy with what she has experienced with one dose today. I'll post more about her when she reports more to me. She has major stomach, arthritis and sleep issues and throw in glaucoma and hearing loss.

I tend to look for the positive aspects of this collagen. I think it's a superb product.

Tomorrow is the month 20 yrs ago when Pycnogenol, then grape seed ex found me....talk about a miracle.