Deer antler velvet has long been purported as a potential anabolic supplement due to either IGF-1 or testosterone interactions. While these interactions have not been confirmed, some studies do show strength improvements in subjects taking deer antler velvet. Results are not conclusive, so try this supplement out and see if it works for you.
Reference: Earnest, C. P., Quindry, J., Panton, L., & Broeder, C. (2015). Effect of deer antler velvet on aerobic, anaerobic and strength performance. Central European Journal of Sport Sciences and Medicine, 1(9), 17-26.