Leadstone quartz surfaces are a safe material for kitchen tops and counter tops, they are safe for direct contact with all types of food due to their nonporous and antibacterial characteristics. 
The National Sanitation Foundation is a non profit organization which helps certify and create standards for food, water and other consumer goods. It’s an independent organization with a commitment to provide education and research in the public health and safety field. Most artificial quartz applications are for kitchen counter top use, it has been important to certify it regarding consumer health and safety.