Which products on the market use key ingredients of the same grade as those in the Fishelton skincare series?

Currently, Estée Lauder is the only brand on the market that uses key ingredients of the same grade as the Fishelton series, namely collagen peptides with a molecular weight below 1,500 Daltons that can be directly absorbed by the skin. However, their products are priced significantly higher, approximately 2 to 5 times the price of our products.