1. Green algae chlorella can be used as food supplements, medicines and cosmetics.

2. porphyra (red algae) can be used as a health food supplement.

3. Macrocystis pyrifera produces iodine which can prevent goiter.

4. Rhodymenia palmata (red algae) can be used as a food source.

5. Red algae also produces carrageenan, a compound that plays a role in making ice cream