Skincare isn't just about the products people put on their faces. Diet and supplements can have a huge impact on skin, hair and nail health, and collagen is fast becoming a secret weapon for unlocking all of this - and one supplement is making waves, after a 60-year-old said it helps her now look 40. The brand iHerb - a global online retailer specialising in vitamins, minerals, supplements and other health and wellness products - has a standout product with it's California Gold Nutrition