Many algae have nutritional value
and commercialized and consumed
human food, they very popular
food the oriental world.
compounds are extracted some
algae, like and pastes for
and commercial use.

agar-agar, used as medium for
biological in laboratories and
medicines, and the known as
carrageenin, component of tooth
,cosmetics, paint and hygienic
, are extracted from
algae. Diatom algae
on the bottom the sea form
,used in the production
filters, refractories, thermal
and cement. Some are used as
fertilizers.