Generally speaking, glycerol is used to replace human lubricating oil, which is relatively less harmful to human body. Vaseline can also replace human lubricating oil, but it is not recommended that you use vaseline, because it is greasy, easy to cause skin allergies, and not easy to clean, so it is best to buy professional water-soluble human lubricating oil.

Edible oil can never be used to replace human lubricating oil, because edible oil can play a lubricating role when it is first added, but because edible oil is very easy to "oxidize" and deteriorate in the air, it will not play a lubricating role in a short time, and it will leave a lot of deteriorated substances, so edible oil can not be used as lubricating oil.

Extended information Types of human body lubricants:

Waterborne class

Made of water and fiber, it is most acceptable on the body surface. It is easy to lose its effect after drying, but it will recover after supplementing water. Therefore, it is often used as a sexual lubricant.

Oiliness

Made of mineral oil, unlike water-based ones, it will not react with body fluids, so the effect is lasting. The lubrication effect is poor. This kind of lubricant has a long-lasting effect and is difficult to clean. Often used for medical purposes. Oil-based lubricants will weaken the effectiveness of condoms, and lubricants attached to the body surface will easily increase bacterial infection.

Silicon-containing class

A mixture of silicon and oil. Easy to react with substances containing silicon, such as silicone rubber.

References:

Baidu encyclopedia-human lubricant