Vitamin B1 (thiamine) is the most likely culprit. Partly because it is essential for brain function and, being water soluble, can be depleted by dehydration and other means. Therefore, it can be found in every multi vitamin on the market- hense why that taste is everywhere.
If you have ever had pill form B1 supplements, you know how incredibly potent their smell truly is; I one time hit a lid off of a bottle on mine, in a cabinet, and the odor perforated throughout the room.
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