I don't see it being a problem. On injection times that I am taking both, I will draw both up into the same insulin pin. I prefer to take my GHRP via IM, so it works out just fine. I do find that both peptides on their own, hit quickly and can cause me to go a little hypo. Combining the two can make that worse, so if you are using a low carb diet, be aware and be prepared for that, if you are taking it pre or post workout and may be away from your food. Its not bad like going hypo like you would from insulin, but enough to suffer discomfort.