Yeah, it’s safe, but it’s hard to know the exact dosage since it depends from person to person. I would say you should try something else, but if you really want to try this one, start with a small dosage first.
Whether you can use it without further refining depends on how pure it needs to be for the next step. If the next step isn’t sensitive to impurities, you might proceed. However, if it needs to be clean, it’s better to purify the oil first by washing or extracting it.