There may be oil on the wine bottle soaked with Cordyceps antler for the following reasons:

1. Cordyceps pilose antler contains oil, which may be dissolved in wine and attached to wine bottles during soaking.

2. During storage, poor sealing of the bottle body or external pollution may cause oil to enter the wine and adhere to the bottle body.

If you find a lot of oil on the bottle, it is recommended not to drink it, so as not to affect your health. The next time you soak wine, you must use a clean and sealed container to avoid pollution and impurities from dissolving into the wine.