I think it’s macroscopy vs microscopy.

Food and nutrition and health is all “invisible” to you in a way that a cat engine isn’t. To the average person, even hearing cellular functions explained sounds like magic, because it takes SO MUCH knowledge to get to the point where you can truly grok how a specific medicine works in the body.

That also explains why fuel additives are an area where that happens in cars. You can’t see the difference in e.g. AKI ratings in action. You can’t see summer vs winter fuel blend changes. So why isn’t it possible that this additive could do things you can’t see as well?