Bilberries, or Nordic wild blueberries, are sweet purple berries that grow wild in the forests of Nordic countries. But bilberries are very fragile. After just two days after harvesting, their nutritional value begins to fade.

To ensure the tiny berries hold on to their precious antioxidants, companies in Finland spend entire days sorting and freezing them at precise temperatures. That's because bilberries are highly sought after in the health-food industry, where they are sold in the form of juices or supplements that can reach over $200 per kilogram.

So what makes these tiny berries so nutritious? And why are they so expensive?

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Why Nordic Wild Blueberries Are So Expensive | So Expensive Food | Business Insider