Collagen Greens on a quarterly subscription is £120 for three packs, delivered free — £40 a pack, against £165 for the same three bought one — off. That is a £45 saving. Collagen Greens combines creatine, collagen, digestive enzymes and wholefood greens in a single scoop. Deliveries arrive every three months and can be stopped before the next charge. A monthly plan is also available at £47 a pack.