Prototype #37-C is a deep wrinkle cream with a 99% peptide concentration. They say peptide is the most important ingredient in any wrinkle cream. According to one website Prototype #37-C was designed with 3 patented peptides and 3 clinical proven peptides that make up 99% concentration. With this formula, Prototype #37-C out-performed other "leading" products by 257% and users indicated wrinkles disappeared 5 times faster than other "leading" products." So if you are looking for a wrinkle cream maybe this product is worth checking out.