Not surprising considering its name, but Lean System 7 (LS7) contains a proprietary blend of 7 fat burning herbal compounds. The exact blend will differ slightly depending where you buy your Lean System 7. The Canadian version for instance, contains weight loss winner green tea, but not 7-keto because of a difference in laws that regulate supplements.

Good news -- the updated version of the U.S. formula now contains green tea --fantastic news, since green tea is a great fat burning supplement. The foundation of this product lies with old standby ingredients guarana and yerba mate. Both of these ingredients contain high levels of caffeine (as well as other xanthines) which in itself is a decent thermogenic (fat burner). Mate also displays diuretic properties, and, when combined with guarana and damiana, has been shown to delay gastric emptying and promote a feeling of satiety (fullness).

Lean System 7 also contains citrus aurantium or bitter orange (standardized for synephrine, ephedrine's milder, gentler cousin). Theoretically, citrus aurantium extracts should be decent fat burners since the active ingredients (synephrine and phenylephrine) are both sympathetic alpha agonists. However, real solid clinical data validating the effectiveness of this ingredient for weight loss is in short supply.

You'll also find dandelion root/leaf included for its diuretic properties (

a full reveiw of dandelion root can be found here!), and bioperine, an ingredient which increases the bioavailability of certain ingredients by enhancing absorption (a full review of bioperine
can be found here!).

Besides that, there's a much more interesting ingredient in this Lean System compilation, namely...

7-keto.

i) 7-keto: a metabolite of DHEA, with no apparent side effects - i.e. no conversion to testosterone or estrogen, and no effect on the sex hormones. What's promising about 7-keto is its positive effect on thyroid hormone levels -- without any adverse effects of any kind.

In quoting a recent study in his superb

Diet Supplements Revealed (where the control group lost 0.57% of their bodyweight, and the group on 7-keto lost 1.8% - about 6 lbs on average), Will Brinks' says 7-keto is a potentially promising weight loss agent!

The promising beginning aside, these are clearly early days for 7-keto. More studies need to be completed to more thoroughly demonstrate 7-keto's fat burning ability.

For now, what's the bottom line recommendation?

Well, I've had the opportunity to try both the Canadian and American versions of Lean System 7. I found that LS7 worked far better than most ephedra-free products at supressing my appetite. I don't know whether it was my imagination or not, but I thought I felt fuller for longer too. I found three capsules made me too jittery though -- the perfect dose seemed to be two capsules three times a day, as opposed to the recommended 3 capsules 2X a day.

Will Lean System 7 work for you? Well, I can guarantee that if you don't make any changes to your diet and lifestyle, or you continue to consume significantly more calories than you need, it will not do anything for you. This is not a magic pill -- it should be used to supplement a smart diet and exercise program.

That said, there are two things I really like about this product.

First, I like the fact that Isatori guarantees Lean System 7. If you buy Lean System 7 direct, they offer a 60-day unconditional "no-questions asked" money back guarantee (less shipping and handling).

Second, Lean System 7 is one of a handful of products that has a real, credible double-blind, placebo controlled study validating its effectiveness.