I read protein was included and they asked if they used any of them with no indication of combinations.The researchers, led by Tongzhang Zheng, found that men who reported using bodybuilding supplements with creatine or androstenedione had a higher chance of developing testicular cancer. “The observed relationship was strong,” Zheng said in a press release. “If you used at [an] earlier age, you had a higher risk. If you used them longer, you had a higher risk. If you used multiple types, you had a higher risk.”