Shoppers are snapping up a collagen powder that they say leaves skin feeling 'firmer and tighter' - and it can easily be incorporated into daily routines. The Vital Proteins Collagen Peptides (unflavoured) powder is currently available from wellness brand iHerb . It can be bought for £51.42 for a one-time purchase , or shoppers can go for the 'autoship and save' option, which costs £46.28, and the subscription can be skipped, changed or cancelled at any time, the site says. Plus, shoppers can