Is it safe to use a hair laser cap with oil treatment in your hair?

Clear oils should be fine to use with any laser device for hair growth although most instructions state to use on clean hair/scalp. I would not recommend using them with an oil that is dark colored, only clear. I would also be careful if you use any botanical oils to make sure they don't make you more sensitive to light. There are some plants that can cause "photosensitivity" and should be used with caution in any visible light which includes the hair laser devices.

Go ahead, there shouldn't be any issues with using laser light therapy and oils concurrently to help aid your hair/scalp. Neither are guaranteed to give results but they definitely have the possibility to help.

The laser hat is not very effective at producing hair loss, but if you put oil on your scalp, it will be less effective.