Collagen supplements are currently among the most popular supplements when it comes to achieving more beautiful, plumper skin. But what are the benefits of powders, pills and the like?

Do you get as much out of it as a professional medical treatment with micro-focussed ultrasound?

RTL Punkt 12 editor Sarah Stahlschmidt tested collagen powder in a long-term experiment and was accompanied by Dr Michaela Montanari.