The methods of the present invention prepare carrageenan products from processed seaweed material having a solids content of less than 25% by weight solids, using shear stress treatment. The carrageenan products comprise at least about 60% by weight of carrageenan and at least about 2% by weight of acid insoluble material. The carrageenan products of the present invention are useful as components in food products, such as, dairy products, meats, and dessert gels as well as non-food products, such as, toothpaste formulations, cosmetics, paints, films and delivery capsules.