What is your take on L-Carnitine and CLA supplement to aid in fat/weight loss?

I recently ordered the supplements CLA and L-Carnitine. I did some research online and both seem to be somewhat effective when taken separately but is it a good idea to take both at the same time? I also ordered a thermogenic called Oxyelite Pro. Can I take all three of these at the same time to aid in my fat/weight loss? Is it effective in your opinion?