Not yet investigated
What we have so far
Most people do not reach the adequate intake and there is no routine test for it. It builds membranes, makes acetylcholine, and exports fat from the liver.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.