Before trying ANYTHING, if you're on TRT, get everything else mentioned here tested before. If not, you will be just wasting time and money. Some things will work but will be a temporary relief without really knowing what is causing the low libido. Once you determine what is the cause, fix it with proper medication, research it and study it, so YOU can try the best dose for you, and not what a doctor tells you. Once you fix that, add the supplements Nelson mentioned and you'll fuck like a God. Do not put more hormones at this point without having your system very clear. More hormones will only take EVERYTHING out of wack!