I have noticed a difference when I took it by itself, not psychoactive just a little more alert, a little happier, a little more on point etc., nothing drastic but noticeable.
Just don't take it WITH molly itself, you want to take it a few days leading up to usage, and after the 6 hour period of it in your system. If you take it directly with mdma or mda or whatever you have, then you have a higher chance of getting serotonin syndrome and just in general causing more neurotoxicity than you need to. It's great to take afterwards when you are going to bed and I would even suggest 2 weeks afterwards morning and night for a few reasons.
1. When you take mdma, you spike your serotonin and then it drops afterwards slightly but then actually goes back to normal during the next day, however it is the 24 hour point after you have taken it where your serotonin drops drastically and takes weeks to recover. Taking 5-htp will help minimize this and restore the much needed serotonin.
2. Mdma actually stops your bodies production or ability to use (can't remember which) the enyzme in your body that turns tryptamine from food into 5-htp which then turns into serotonin. So this cuts off a huge supply of serotonin you would normally get, but by bypassing the bodies system of using tryptamine and giving it the straight by-product (5-htp) then you can keep your serotonin in good supply. The enzyme will return/work again after a few weeks.
I have seen people get psychologically addicted to 5-htp though so don't let it be your miracle cure to life (but it doesn't sound like you expect it to be anyways)