> I think, it's called sometimes backing soda - the powder you add to make cakes or croissants fluffy. Not to compare with the Natrium bicarbonate which is ...

That's a really strong claim, that someone would mix up the label of baking soda (it literally has "soda" in the name, aka sodium aka natrium if you're not English) with phosphoric acid.

As for the rest of this, it's the sort of thing that might have some truth to it, but it should really have data backing it, because human biochemisty is really complex and often acts counter-intuitively.