I remember coming across some research that even acute mdma use can have lasting effects on the hypothalamus and thus, your LH, FSH and testosterone output - I would imagine GH would be affected as well. I would say the two really aren't conducive to each other. If you've already made your mind up to do it or if you've already done it make sure you take a significant amount of high DHA content fish oil for up to a month after you take it as many pressed club tabs are cut with amphetamines to potentiate the effect of the mdma and a lot of Molly is cut with various analogs from mephedrone to BZP. The DHA should help mitigate any neurodegerative effects from the amphetamines or others and it is good for overall brain health in general. A dose of 5-10g of DHA per day would be a good dose to aim for - just make sure to slowly titrate your dose upward. Check pubmed and see if you can find some published data on hypothalamic effects.