Dry fungus is healthier than fresh fungus. Generally speaking, fresh fungus is not recommended to be eaten directly. This is because fresh auricularia contains a photosensitive substance, which is very sensitive to light. After people eat fresh auricularia auricula, this photosensitive substance will reach the cells of our human epidermis with the blood circulation of the human body, and it will induce phototoxic dermatitis after being irradiated by sunlight. From the symptoms, some people will feel itchy skin, pain, redness and swelling, and even cause serious skin tissue necrosis, but the poisoning dose is very small. Generally speaking, a small amount of food will not do harm to our health, but this side effect is not nonexistent.
Dried auricularia auricula is healthier, because there are actually two toxins in auricularia auricula. The first is that there are a lot of bacteria in the process of planting and drying, and the other is that auricularia auricula may be contaminated by bacteria during foaming and produce toxins. The reason why dried auricularia auricula is healthier is that dried auricularia auricula can decompose most porphyrins after exposure to the sun, and the remaining toxins will be dissolved in water before eating.
To sum up, there is a photosensitive substance called porphyrin in fresh fungus, which will greatly increase the sensitivity of skin to light after entering the body, so it is prone to diseases such as solar dermatitis and rash. If you eat too much, it will cause respiratory mucosa allergy and dyspnea. This toxin is insoluble in water, but when auricularia auricula is dried by sun exposure, porphyrin poison can decompose itself, so dried auricularia auricula is nontoxic.