The following are a few things I noticed while I was on Glutamine standalone.
If I have glutamine say in the morning I find that in late afternoon sex drive goes up but most noticeably I can have erections without even priming the unit manually, and those are strong erections--ok so this is something I've noticed on 1 gram glutamine.
Now, for those who followed my question to be myself again, I've mentioned that in the last year I'd begun having more morning woods. Morning woods are known to be affect by both REM sleep and
Testosterone levels. So in the last year I've had more and more of those almost on each morning, although they fade away when I walk out of bed.
Now here's the interesting part : last week I took tyrosine and initially this increased my sex drive, caused me to have stronger erections, but after a few days at 500-1000 mg/day I noticed no more libido boost and strong erections, and felt more tired than I used to, and no more morning woods. So yesterday evening I popped some valerian before going to bed, and this morning woods were back.