Just stick to your diet and training bro. At the end of the day, that is the key. Perhaps you could use other AAS for further enhancing, but that's up to you. Insulin doesn't really bring major gains anyway, it only allows your body to absorb more nutrition than usual faster, which can lead to higher chances of weight and strength gain further down the track. No big deal, your not missing out on much.
Good luck.
-Gear