peptides seemed to have popped up about 10 years ago.... now we've got probably over 100 common peptides that are used for various things, here is a sample:

1) PT-141 is a peptide that releases sex hormone into the blood and literally makes you horny, and its primary use is for premenopausal women that have low sex drive.

2) PNC-27 is a peptide that supposedly attaches to the cell membrane of tumor cells and performs cell lysis (death) of the tumor cell, and it's supposedly affects many different kinds of tumor cells: breast, pancreatic, lung, colon, ovarian, cervical, and leukemia

3) Epithalon is a peptide that is noted for extending telomers on chromosomes, leading to longevity benefits.

4) MOTS-c is it peptide that in animal studies is shown to boost physical endurance and mimic molecular changes associated with training/exercise.