Beta Alanine, Acetyl Carnosine, Chondroitin, Ester-C, tocotrienols, P5P, ALCAR w/ ALA, Blueberry Extracts, Olive Leaf Extracts, bioflavanoids.... cycling p53 inhibitors with cycloastragenol/TA65.
Vaccines should also help. I read that more vaccines correlated to longer lifespans. Having fewer cells infected by viruses means fewer cells changed by them and I assume that changes to cells from viruses contribute to aging. Viruses evolve the fastest, so we are least well adapted to surviving along side them. They are probably some of our biggest external threats. Get every vaccine you can!
Then there's getting mesenchymal stem cells, they can be taken from adipose tissues, grown outside the body and given to you several times a year. You can even have some frozen for future use.
None of these are specifically linked to a life extension study that I'm aware of, but they are probably our best bets for alot of reasons. Too many to explain them all. Just my best guess.