Hello, this depends on the specific store. Some are clean, but some are definitely unclean. I think the general large-scale fresh supermarket is more secure in hygiene than small shops. But you must clean it when you come back, so you can also buy a small amount to see the appearance, and then consider whether to continue buying.

Expand:

Cow nest bone nutrition: a good nourishing food, with the effect of strengthening tendons and bones.

General practice: put the bone of the cow's nest in a pot, add the broth to boil, skim off the floating foam, add 2g of salt to taste, stew for 2-3h with low fire, add 3g of salt, monosodium glutamate, chicken powder and beef powder to taste again, then add Pleurotus nebrodensis, boletus and ginseng for 2-4 minutes, and add Lycium barbarum and coriander leaves. The clay pot is decorated with broccoli soaked in water.