Optimum is my favorite brand for many reasons. First of all, they make quality products. Secondly, the price is unbeatable. Thirdly, they have every supplement you could ever ask for. Lastly, there products actually work, such as this L-Carnitine. My metabolism is faster than ever and I'm noticing a change in my body, day after day. Wonderful product. Couldn't be happier with illpumpyouup.com also.

I like Optimum Nutrition L-Carnitine because it seems to give me the best sweat out and stamina than the rest.  
 
They have a good name, I trust their products and after years of taking them I know I will get results without a doubt!