Let me begin by saying I took the X-Factor Advanced, which is the newer version. It took about 1 1/2 weeks to start feeling the muscle hardness and strength gains I was hoping to get from this product. After about 3 weeks I did notice a great increase in overall vascularity which was great. The one drawback (which I was worried about from the beginning) was that it flared up the pinched nerve in my neck. The directions tell you to not take anti-inflammatories while on the product because it will reduce the overall effects of inflaming the muscle tissue.... which is how the main ingredient works. I, for one am on a steady diet of Advil because of my neck injury. I wish the side effect wasn't an issue, but it was. There were days when I couldn't possibly lift because I was in so much pain.

The price was a bit high. ($79.99) But, when you consider the fact that you don't need to stack it with anything else... I suppose it's not really all that expensive.

I switched over to Prime / PowerFULL (USP Labs) and am very pleased with the results after just 2 1/2 weeks. Even better results strength wise, muscle hardness, but less vascularity.

Tried a bottle didnt do a damn thing for me and I beleive that this acid you can get enough in your meat intake waist of cash.