I know this is not what you are asking, but out of concern I would strongly advise against this type of product. All of those "fat-burning" miracle products are typically more detrimental than helpful. I have seen people get sick from using similar products with similar ingredients. Just my two-cents, and I know that was not the original question so I apologize!
Phentatrim is the herbal supplement that any local MR Center would give their clients. I do not think they would sell it is their centers if it would make people sick. I have been taking it for a while and have not had any problem.
Phentermine - is a prescription diet pill that could kill people.
Brookiebear - The MR Center has their own special blend that works better on their diet plans. If you are trying to find it cheaper, I have been told that you can take the bottle up to GNC and they can match it up as best as possible.