Not yet investigated
What we have so far
Carnosic acid makes it one of the few natural preservatives that actually works, which is why it appears in clean-label food. The hair-growth trial against minoxidil is small and real.
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.