This MLM claims to be the world leader in "nutritional cleansing and replenishing".

The revolutionary practice of Nutritional Cleansing, which can result in greater health, well-being and weight loss, is the foundation in which Isagenix® and its systems were developed.

Nutritional Cleansing is built upon the health routine of cleansing, including fasting and drinking herbal remedies, which has been practiced throughout history. Cleansing gives the body the chance to rest, regenerate and assist in its natural ability to remove toxins and impurities to promote long-term wellness. However, Nutritional Cleansing improves upon this ancient practice with a system that cleanses, replenishes and revitalizes the body with essential nutrients. Fasting helps to remove impurities from the body, but Nutritional Cleansing speeds up this process by infusing the body with healthy nutrients.

In simple terms, Nutritional Cleansing can be compared to changing the oil in your car. We regularly change the oil in our cars because it gets dirty and clogged by pollutants. We drain the dirty oil and replace it with clean oil, which helps our cars to run more efficiently. The same can be said for our bodies. We are regularly exposed to pollutants in our environment, impurities in our diets and stress that is often created by our hectic lifestyles. Nutritional Cleansing helps the body and organs to do what they are designed to do naturally and remove impurities.
Harriet Hall, M.D. posted an article, Defending Isagenix: A case study in flawed thinking

Highlights:
I didn’t set out to write an article about this. It started when I received an e-mail inquiry about Isagenix. I posted my answer on a discussion list and it was picked up and published on the healthfraudoz website. Sandy Szwarc approved of it and kindly reposted it on her Junkfood Science blog.
As I write, the comments on the healthfraudoz website have reached a total of 176. A few commenters approved of what I wrote, but the majority of commenters tried to defend Isagenix. Their arguments were irrational, incompetent, and sometimes amusing.

It was as if no one had actually read what I wrote. No one bothered to address any of my specific criticisms. No one even tried to defend Isagenix’s false claims that toxicity accounts for most disease, that the body protects itself from toxins by coating them with fat, and that internal organs become clogged and deteriorate if you don’t “cleanse.” No one offered any evidence that “detoxification” improves human health. No one tried to identify any of the alleged toxins or show that they are actually removed. No one tried to provide any rationale for the particular combination of ingredients in Isagenix products (242 of them!). No one questioned my assertion that “no caffeine added” was inaccurate because green tea was added and it contains caffeine. No one commented on my observation that the amount of vitamin A in the products was dangerous and went against the recommendations of The Medical Letter. No one offered any evidence that more weight was lost by adding Isagenix to a low calorie diet and exercise. I offered some alternative explanations that might account for people believing it was effective when it wasn’t; no one commented on that. The medical advisor on the Isagenix website argued that at $5 a day Isagenix is less expensive than open heart surgery. I pointed out that that was a laughable false dichotomy: it’s not a matter of choosing between open heart surgery and diet supplements. No one commented on that. Instead of rational responses, we got …
Testimonials
Anti-Testimonials
Rebuttals to Negative Testimonials
“Evidence” that it works
Defense of Multi-Level Marketing
Personal Attacks on Me
Kudos
Attacks on the Medical Profession
Attacks on Science
Attacks on FDA and Big Pharma
Off-the-Wall False Claims
Try It for Yourself
Haven’t Tried It But Plan To
It’s a Scam
2 Jokes
Funny, Unhelpful, and Bizarre Comments
Sound familiar?