This is probably what he is using, an incredible peptide.
Check out this quote from a prominent researcher on this drug:
In another study the muscle fibers of 27-month old rats – old age for rats – that were given IGF-1 during middle age, exhibited no deterioration of muscle fibers that indicate the classic and inevitable signs of aging. These rats did not lose any fast twitch muscle fibers – the fibers responsible for power and speed – and had the same speed and power output that they had when they were six months of age.
AND
Rats that were given IGF-1 and did nothing were bigger and stronger than rats that weren’t given IGF-1 but exercised. And I’ll bet you guessed that rats that were given IGF-1 and exercised were the biggest, strongest rats in the house. The positive effects of IGF-1 on the rats continued for months after the rats stopped getting the supplemental hormone, whereas the exercising rats immediately lost size and strength as soon as they stopped exercising.
http://www.evolutionary.org/igf-1-lr3-the-anabolic-powerhouse/