When taking gh, it is possible that it will speed up the turn over of T4 (inactive thyroid) to T3 (active Thyroid). So for this reason, t3 levels may be a little higher than normal, but T4 levels can be a little lower than normal. So if this happens, a low dose of T4 would help. If you feel ok while on gh, not having symptoms of hypo-thyroid, then I would not add additional drugs. Keep it simple is always the best option. But if you are feeling hypo throid, you should get some labs to see what your levels are. If you are low on T4, you can add it into the plan. I would start very low. It should not take much. 50mg T4 would be the average amount that someone would use