Dr. Oz has never recommended any brand. Visit his website and you will see a statement he made making it explicitly clear he never endorses any specific brand of supplement. He did do a show about the "possible" benefit of a chemical in mango seed extract and that started all the trouble for him. Trust me. If it truly worked the pharmaceutical companies would already have extracted the active component, run true clinical trials not studies, and patented it as a proven drug.
Mangoes are just a part of an overall healthy diet.
Anything in a supplement pill does two things.
First, you deny yourself the wonderful fiber in fresh mango. Fiber keeps your system active, clean, and regular. A healthy high fiber diet aids the immune system more than just about anything.
Second, dietary supplements are not regulated so often do not contain exactly what is on the label.
Eating mango or ground mango seed will not make you lose weight, that is all just hype. African mango seed extract is the latest "weight loss miracle" that doesn't work. Right behind acai berry, hoodia, fruta planta, green tea extract, chia seeds, maqui berry, and all the other "exotic" supplements out there.
Again a healthy high fiber diet is the best weight loss tool available.
Both Oprah and Dr. Oz have filed lawsuits against all these peddlers exploiting their names to profit. These sites have been reported as spam and should legally be removed soon. There are just so many his lawyers can only do so much. Save your money.