Not for MT in particular but at times when fighting heavy weight or open class and for extra muscle, size and strenght I have used legal testosterone boosters (so called, as outside of actual steriods which have a guaranteed result, it can be hard to know what is a placebo effect, etc), such as tribulis terristris. I do find this does seem to boost testosterone and the strength and size that comes with that - in conjunction with hard training of course and potentially other supplements. I have not used that for a long time but found no issue with it when training and competing. You need to always check your restricted substances rules / general rules for any tournament/event of course if there is any testing. And you should form your own views on personal research : )
