Generally, there are very few real pearl powder, especially dozens of cheap ones on the market are shell powder, without exception.
Fake pearl powder contains bleach and heavy metals, which is harmful to health. Especially for babies.
Suzhou time-honored brand Zhenshichang, the price of pearl powder is about 10 yuan 1 g, which can be taken orally (Taobao is cheaper).
The price of real pearl powder is almost the same, as long as it is really expensive.
The oral pearl powder exported by Zhenshichang is more expensive, tens of dollars a gram.
Of course, I haven't seen it. I just heard about it. The price is negotiable.