Penis enlargement cannot be achieved with pills. Or with creams, lotions, or other medication. Or with vacuum devices, or stretching exercises (which can cause damage; at least the medications are probably mostly harmless). Or with any other method short of surgery, and you don't want to go there!
Save your money and enjoy what you have. Do not believe that what you might see in some pornography is normal or attainable for most men. Do not compare yourself to others in areas where development is impossible. Concentrate on keeping healthy with good exercise and diet.