Tongkat ali is, by far, is the best thing that I have encountered. Mixes with things like horny goat weed, etc. are useful, but there are lots of positive effects in going with tongkat ali alone. It appears to act to modulate the hormones in men.
It will increase the free testosterone in your system, and has positive effects on exercise, appears to slow some of the aging effects, and most certainly can amp up the libido. It also restores recouperative sleeploss due to aging.
It’s fun to experiment with; you can go quite high without toxicity, but it can have effect on your sleep. Do a google search and find some articles under “asiatour” that can be useful.
Add sufficient exercise, a good healthy diet, and multivitamins and you should be good to go.
You can buy extract in bulk, as well as some trial experiment packs, here.