Nopolea contains useful antioxidants and particularly bases many of its health claims on its high concentration of betalains. The jury is out as to exactly how beneficial these compounds are but if you want to have the benefit of betalains then beetroot juice is a rich source and much cheaper.
Deep purple, red, and blue fruits all contain high levels of similar antioxidants although some contain betalains while others contain anthocyanins. Anthocyanins are the compounds in the equally expensive acai berries. These too can be sourced more cheaply in blackberries and blueberries.
Like most 'superfoods' the claims aren't necesserily false but whether it is worth paying such a premium price is another matter. A little research on the ingredients and on what other sources can provide them can save you a lot of cash.
If all that sounds like hard work then a really varied diet of as many natural foods as possible will almost certainly cover the body's needs.
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