Just about any of the three major tea groups are going to be beneficial in helping you lose weight. Most people recommend drinking green tea, but if you prefer you can drink black tea or white tea as well. While green tea is touted as the one that is going to help you lose the most weight, the fact is that white tea actually has the highest concentration of beneficial compounds. Conversely, black tea has the least.
Those are the ones I’d stick to. I wouldn’t necessarily trust any other “slimming, herbal teas” as there is just about no science backing their claims for weight loss or enhanced metabolism.