No7 Laboratories Firming Booster Serum Large 30ml Size Super Concentrate Product description This clinically proven targeted booster serum has been designed for areas of the face most prone to loss of firmness. Contains 4x more firming complex than our clinically proven serums. In just 1 week skin looks and feels firmer, while face and neck look lifted. By 2 weeks face and neck look visibly lifted. Women agreed that this booster serum gave them the best results they had seen from a skincare product, and better results than they thought possible from skincare alone.