I have been taking P6 Extreme black for 5 to 6 months now, and I have noticed a difference in my muscle mass. I walk 3 to 4 miles a day, and lift weights. I am 61 and my metabolism is slow, when I was younger I had a hard time putting on muscle, but I have seen my arm and leg muscle mass increase, more than I have ever experienced. Some would say yea that is from the exercising, not only that, but I have lost most all the hair on my legs, but now hair is growing back all over my legs. I hope my head does the same. I got my P6 at GNC, 90 capsules for under $100. I only take two capsules a day. I will increase it to 3. For me, P6 extreme Black is working!
The competing Athlon 64 X2, although running at lower clock rates and lacking Hyper-threading , had some significant advantages over the Pentium D, such as an integrated memory controller , a high-speed HyperTransport bus, a shorter pipeline (12 stages compared to the Pentium D's 31), and better floating point performance,  more than offsetting the difference in raw clock speed. Also, while the Athlon 64 X2 inherited mature multi-core control logic from the multi-core Opteron , the Pentium D was seemingly rushed to production and essentially consisted of two CPUs in the same package. Indeed, shortly after the launch of the mainstream Pentium D branded processors (26 May 2005) and the Athlon 64 X2 (31 May 2005), a consensus arose that AMD's implementation of multi-core was superior to that of the Pentium D.   As a result of this and other factors, AMD surpassed Intel in CPU sales at US retail stores for a period of time, although Intel retained overall market leadership because of its exclusive relationships with direct sellers such as Dell. 
The takeaway is the Fenugreek may mildly boost testosterone simply by not losing any to DHT. One thing we’d like to know is what standard are they extracting for? Recently we’ve seen 50% extract used in MAN Sports’ Delta XT , but we’re not sure what Cellucor is using in P6, Chrome or Red.