Are marine plants used in toothpaste?

Yes, and lots of other products, too. Substances from marine plants and animals are used in many home products, including ice cream, toothpaste, fertilizers, gasoline, and cosmetics. If you read the labels of some of these products, you may find the words carrageenan and alginate. Carrageenans are compounds extracted from red algae that are used to stabilize and jell foods. Brown algae contain alginates that make foods thicker and creamier and add to shelf life. They are used to prevent ice crystals from forming in ice cream, for example. Alginates and carrageenans are often used in puddings, milkshakes, and ice cream. The remains of diatoms (algae with hard shells) are used to make pet litter, cosmetics, and pool filters. The kelp plant is often used in lipstick, toothpaste, and clothing dye.