The effects of oral administration are: enhancing immunity, supplementing calcium, preventing Yan Chun's aging, improving sleep, treating ulcer, nourishing liver and improving eyesight, and assisting in lowering blood pressure.
The effects of external use are: whitening, controlling oil, removing acne, removing blackheads, lightening spots and promoting granulation.
If the quality of pearl powder is good, there will be no side effects after oral administration. I'm afraid that some inferior pearl powder can't be digested completely in the stomach and form stones. But generally speaking, don't take a lot, take it regularly, and there will be no side effects.
Might as well make a mask. Pearl powder and honey are often used as masks, which have a good effect on acne and whitening, and the pores will be small.