Free Benefit b.right Facial Serum 5ml Sample. Terms: This offer is only available to the first 8,000 readers to enter their details in full at emeraldstreet.com/benefit before the 8 July. By registering for a free sample from Benefit, you will be signing up to Emerald Street’s daily email. (You can unsubscribe by clicking 'Report spam'/or the 'Unsubscribe' link on their email). The offer is valid for one person per household to receive a free 5ml sample of b.right instant comeback facial serum from Benefit.