Last year, Swedes bought dietary supplements for SEK 3.1 billion.

Sales of dietary supplements are increasing, despite the fact that most people can get the nutrients we need through food.

- Everything is about getting the right dose.

We should have quite a bit of these vitamins.

If we get too many of them, there may actually be risks, says Emma Frans, researcher at Karolinska Institutet.

The most important thing is to eat a varied diet.

- Then you get this need without risking getting too much.

However, some people may need to take supplements - as you can see in the video above.