What is the principle of hairy tofu? Is it harmless to human body?

Hairy tofu is a traditional dish of the Han nationality in Huizhou (now Huangshan City, Anhui Province). It grows a layer of white fluff on the surface of tofu through artificial fermentation. Because the plant protein in tofu is transformed into various amino acids by fermentation, it tastes particularly fresh after cooking.

It doesn't matter if you eat often, but it's best not to overeat every time.