There is calcium carbonate in the egg shell, although it can be fed to cats to supplement calcium; However, excessive calcium carbonate will cause flatulence in the cat's stomach, which will harden the stool and lead to constipation. The suggestion is to mix it with food and control the dosage, not too much.

Egg shell can make acid and relieve pain, and it can be used for external use to stop bleeding, stop astringency and astringe after grinding. Oral administration of eggshell powder can be used for gastric ulcer acid regurgitation and gastritis pain, and is beneficial to calcium supplementation (calcium food). The thin skin lined with eggshell has the functions of nourishing yin, moistening dryness, moistening lung and relieving cough, and is suitable for wind dryness and dry cough. Egg yolk is widely used in folk, such as chapped nipple and skin ulcer of lower limbs. Traditional Chinese medicine believes that egg yolk has the function of nourishing blood, nourishing yin and improving intelligence, and is used for deficiency of heart blood, insomnia and restlessness.