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Is it worth taking collagen? With cosmetic companies and A-listers claiming it can slow the effects of ageing, the market for collagen supplements is booming. How sure is the science though?

Ruth Alexander speaks to experts about what we do and don鈥檛 know about what these powders, gels and capsules are doing inside our bodies.

She hears from a personal trainer and runner in her 50s about why she takes it daily, and speaks to the CEO of a company selling collagen products in this increasingly competitive market.

New avenues of research are opening up as well, with sports scientists investigating whether an increase in collagen production can help athletes recover from injury more quickly.

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk

Presenter: Ruth Alexander

Producer: Hannah Bewley

(Image: A serving of supplement powder. Credit: Getty Images)