Similarly, the extract of diverse types of seaweed are also becoming widely known for their impact in health and beauty aid. There are 22,000 species, after all. Studies are increasingly linking seaweed extracts not only to better protected and hydrated skin for reducing the signs of aging, thanks to that glorious Fucoidan molecule, but also for their nutritional value when these seaweed extracts are ingested — demonstrating help with thyroid function and even improving gut and heart health.