Wasn't it *B7* (=biotin) that this effect was attributed to??

Wasn't it *B7* (=biotin) that this effect was attributed to - just yesterday or the day before, on this very forum?

I'm starting to suspect these studies are messed up and getting results from something else entirely!

B vits are commonly derived from yeast sources. Could it be that the studies received a batch contaminated by killer yeasts (so named by the brewing and bread industries, they kill other yeasts, not people :)?