Yes, vegetable oil is safe to use for lube. However, there are some things to keep in mind when using it. First, vegetable oil will break down condoms, so if you're using them, be sure to use another form of birth control as well. Second, because it's an oil-based lubricant, it can't be used with latex gloves or toys. Third, it can stain sheets and clothing, so be careful where you use it. Finally, while it's safe to ingest in small amounts, swallowing large amounts of vegetable oil can cause gastrointestinal distress.