On 19 May 2016 the Higher Administrative Court of North-Rhine Westphalia ruled that organic soy milk may not contain powdered lithothamnium. Natural soy milk contains much less calcium per liter than cow milk. Therefore, often commercial soy milks are fortified with extra calcium. The court was of the opinion that the use of powdered lithothamnium was not in line with the the European regulations governing the production of organic foods.
Lithothamnium comes from seaweed.
The court considered the substance a mineral substance of non-agricultural origin. The use of these substances is not allowed for the production of organic foods, unless specific regulations allow the use of mineral substances. For soy milk there is not a regualtion in place providing the use of calcium.