Gene's stack really does work. It's not cheap by any means. It would be a good starting point, he's put a lot of thought into it. If that does not work, I would pull a male panel (you can order yourself, here from this website). Look for "free" testosterone on the results, and if it's low reference range, or even below reference range, this would affect libido very, very much. I would also add "free" T3, or FT3 to the blood draw. For optimal thyroid, it should be around 3.5 give or take. The thyroid is the accelerator pedal for the body, and again this is a whole body check for good health. Personally, I'm 60, and was having a hard time being "firm" for date night with the wife. I created my own stack, I just kept adding things until I got the results I needed for me. I take two big scoops of l-citriline-malate, 1/4 teaspoon horny goat weed, 1/4 teaspoon longjack, and 1/4 teaspoon pinebark extract. All are Bulk Supplements brand I got from Amazon. I put them in a shaker bottle (one of those protein powder shaker bottles), and fill to 16 oz. I shake and let it sit for awhile, then shake again. I drink half in the morning, and the other half at night. This combination tastes something like battery acid and rancid ice tea mix. I won't lie to you...it's awful. I brush my teeth afterwards...this stuff feels like it might disolve all your teeth honestly. But if it helps me hammer the wife for 40 minutes like I can do when I drink it....I'd swallow bug juice. Without all this stuff, I'm lucky if I'm hard enough to even get it in. If your blood pressure is not over range high (you should own a BP cuff), you can also add Primaforce Yohimbine HCL, I got it from Amazon. If you take two capsules along with the stuff I listed above, it's raised my libido like you are some sort of animal. This is what worked for me....we are all n=1...and you need to add stuff and check your blood hormones until you get the answers and results you need. Peace.