Victoria Beckham and newly engaged Keeping Up With The Kardashians star Kourtney Kardashian are avid fans of collagen supplements, having previously raved about them on their social media channels.RELATED: Discover the best collagen supplements – plus, what are the benefits?Renowned for their ability to improve the appearance of dry, dehydrated and dull skin, and aid with anti-ageing concerns, collagen supplements are proving ever popular with skincare fans.Victoria Beckham has been known to