Kelp is large brown algae from the Pacific Ocean. Any plant growing in the sea is seaweed. Seaweeds are algae. The large brown algae, kelp, is harvested, dried and ground. This material is used for kelp tablets and seaweed powder.
The composition of seaweed is 5.7% protein 2.6% fat, 7.0% fiber, 58.6% nitrogen free extract, 15.4% ash and 10.7% moisture. Nutritional value of kelp is dependent on the species, season, temperature of the water and geographic area.