CBD oil can have unexpected effects if it contains too much THC or not enough CBD. This is possible if the oil is from a poor quality manufacturer. CBD may also have side effects including nausea, fatigue and irritability. However, this has not been fully scientifically tested. Only anecdotal reports are available.
Can CBD oil turn into THC? It can, but only in very select circumstances. It doesn’t change into THC on its own, e.g. by going stale or going bad. There’s no danger of this occurring. CBD also doesn’t turn into THC when ingested (at least not in any more than trace amounts). However, CBD is chemically similar to THC. This means it can be transformed into the illegal compound in a laboratory setting.
Is CBD oil safe? It isn’t addictive or habit-forming like recreational marijuana. It also doesn’t get you high in the same way that other cannabis products do. It, therefore, doesn’t pose a risk like a drug might. However, the long term effects of CBD oil on the body haven’t been fully explored by scientists yet.