Together Health's potent calcium seaweed comes to you in a complete, natural marine multimineral complex providing bioactive calcium - with 72 other trace minerals in there, too. Together Health's potent calcium seaweed comes to you in a complete, natural marine multimineral complex providing bioactive calcium - with 72 other trace minerals in there, too. This calcium is derived from 100% seaweed, which absorbs trace minerals from the surrounding seawater. After that, the seaweed is harvested sustainably from pristine waters off the Irish coast. Most calcium supplements out there are made up of inorganic compounds like limestone or oyster shell. These elements simply aren't well tolerated or absorbed by the body. Together Health knows that our bodies can recognise minerals with ease when they come from natural and complete sources - not when they're synthetically created. By keeping things natural, we can identify and absorb all that natural goodness far more effectively.