If you are looking for mood enhancement while dieting, the new version of norcodrene is a vast improvement over the original. Lemon balm and theanine are excellent for mood elevation and have several studie showing so. If you want pure fat loss, I prefer SHIFT (also by PEScience).
Cases J., et al. (2011). Pilot trial of Melissa officinalis L. leaf extract in the treatment of volunteers suffering from mild-to-moderate anxiety disorders and sleep disturbances. Med J Nutrition Metab.
Kennedy D., Little W., Scholey A. (2004).Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis (Lemon Balm). Psychosom Med.
Higashiyama, A., Htay, H., Ozeki, M., et al. (2011). Effects of l-theanine on attention and reaction time response. Journal of Functional Foods. 3:3(171-178).
Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). l-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39-45.
KOBAYASHI, K., NAGATO, Y., AOI, N., JUNEJA, L. R., KIM, M., YAMAMOTO, T., & SUGIMOTO, S. (1998). Effects of L-Theanine on the Release of Alpha-Brain Waves in Human Volunteers. Journal of the agricultural chemical society of Japan, 72(2), 153-157.
Lu, K., Gray, M. A., Oliver, C., Liley, D. T., Harrison, B. J., Bartholomeusz, C. F., Phan, K. L., et al. (2004). The acute effects of L-theanine in comparison with alprazolam on anticipatory anxiety in humans. Human Psychopharmacology, 19(7), 457-465.