This research was published in Developmental cell Oct 2018 issue, but appeared in preprint In June in bioRxiv, It shows synergies in combining life extension strategems by combining several strategies.
Doubling healthy lifespan using drug synergies
Tesfahun Dessale, Krishna Chaithanya Batchu, Diogo Barardo, Li Fang Ng, Vanessa Yuk Man Lam, Linfan Xiao, Markus R. Wenk, Nicholas S. Tolwinski, Jan Gruber
bioRxiv 153205; doi: https://doi.org/10.1101/153205