Natural Product Produced by Marine Algae Shows Promise in Stroke Recovery Treatment

I dislike the term natural since it has no regulated meaning. Heck, arsenic is natural.
 You can read the news article here:
http://www.newswise.com/articles/natural-product-produced-by-marine-algae-shows
The tiny marine dinoflagellate Karenia brevis produces brevetoxin, which in high concentrations is responsible for the harmful algal blooms known as red tides that occur in the waters off the west coast of Florida. The neurotoxin-laden red tide causes respiratory irritation in humans and central nervous system paralysis in fish.

Or if you are a glutton for punishment you can read the abstract here:

Bidirectional influence of sodium channel activation on NMDA receptor–dependent cerebrocortical neuron structural plasticity