From the RC FAQ website today:
Does the recent issue in South Africa affect the few Royal Canin USA pet food products that include corn gluten?
No. Products manufactured by Royal Canin South Africa are not distributed in the US.
Royal Canin USA does not source its corn gluten from China.
Royal Canin USA corn gluten is sourced from suppliers in the US.
Thank goodness! Mine are on sensitive 30/puppy 33!!