In fact, they sell more than 50 per cent of all RSPCA Assured products sold in the UK.
"The RSPCA Assured label gives consumers confidence that the food they're buying has come from an animal that has been cared for to strict RSPCA welfare standards, for the whole of its life."
Judith Batchelar, director of Sainsbury's Brand
Sainsbury's stock 899 different products, including chicken, eggs, pork, salmon, trout, turkey and veal.
Judith Batchelar, director of Sainsbury's Brand, said: "We share the concerns of many people that some operations have poor animal welfare standards.
"Animal welfare is important, principally for the animal, but better management and care for livestock can improve productivity and food quality.
"By 2020, all our meat, poultry, eggs, game and dairy products will be sourced from suppliers who adhere to independent higher welfare standards."
To find out if there's a Sainsbury's store near you, and for other retailers which stock products with the RSPCA Assured label, check out our Where to buy page.