NOTE: Nutri Diem, manufacturer of the Calorad, announced July 7, 2021, that the Calorad ADVANCED BOVINE (only) is on back order. It will arrive in 2 weeks or less. Please consider ordering the Calorad Advanced Marine or Calorad Classic Bovine or Marine (35+ yr success history). The only difference is the source of the collagen. Please accept our apologies for any inconvenience. We only provide fresh product. For Now: The Calorad Advanced Marine will be shipped in place of the Calorad Advanced Bovine.