You could go herbal with ephedra, but that's really the same thing as taking ephedrine. The amino acid phenylalanine will help, but generally not enough. There have been studies on 5-HTP and tryptophan and weight loss. And Dr. Ray Sahelian uses 5-HTP for weight loss in his patients. He has a book coming out, and I was interviewed for it.
Tyrosine is the immediate metabolite of phenylalanine.
In some people tyrosine produces appetite increase. One of the reasons may be that it puts to much dopamine into your system at once. It's one of the peptides being researched in clinical studies. No CCK is a peptide, and as such it can only be injected. You're welcome aburns.