Absolutely not. Unless of course, the person is 1) not eating a proper raw diet, 2) still in the detoxification stage, or 3) an extremely rare case. Of course, if you have any doubt, then I advise you to see your physician (hopefully they know how health is actually created, which is not usually the case, since medical doctors are taught how to prescribe drugs or to perform surgery, not to create health). Still, I have to "cover my ass" and tell you that you should get a blood test if in doubt about your health.
That being said, I have not known anyone who is on the Best Weigh raw diet (and I have had clients on this diet since 2001) who has experienced anything other than extreme health. Of course there are those who have quit the program too soon, changed it significantly, or deleted key foods. I have actually met some of these people years later who tell me right to my face that they have been "raw" for the last year or so and that they are sick. But they may eat raw once in a while, but they are not raw. Surely not Best Weigh raw.
The need for supplements diminishes as we learn that the human body can only recognize and utilize nutrients in their natural whole food state, which means raw and un-processed.
Even if you were to take, for example, the most expensive green powder, you would only be getting 50% of the nutrients at best that your cells needed for basic life no matter how much volume of the product you consumed.
Still, there are those who insist that supplements are needed. They tend to benefit from the monetary gains. Or they simply have not experienced the benefits of a truly raw vegan diet!