There are non-steroidal OTC supplements that are specifically anti-catabolic instead of anabolic like HMB[1], a metabolite of the amino acid leucine, and also widely used in the fitness community. Personally I have no idea which is preferable though, or whether anti-catabolism is something actually positive, as we know the importance of autophagy of senescent cells for longevity. Most of the literature I read suggests the less growth signalling, the better longevity, with the only exception being the frail elderly.

[1] https://en.wikipedia.org/wiki/%CE%92-Hydroxy_%CE%B2-methylbu...