Charles Worthington Shine Plex Vitamin C Serum The Charles Worthington Shine Plex Vitamin C Serum (£8) is an oil-serum blend that helps add shine, whether you use it on towel-dried hair before you blow dry your hair (or air dry it for that matter), or use it atop dry hair when your strands look a little dull and frizzy. Image Source: boots.com Charles Worthington Shine Plex Vitamin C Serum £8 from boots.com Buy Now