A list of the best hair oils for strength and shine has been compiled after testing dozens of options. However, it appears that multiple unrelated product tests have also been conducted, including tests of wireless earbuds, curling irons, cat litters, at-home laser hair removal devices, heat protectant sprays, hydrating hair masks, dog beds, and fitness trackers. The outcomes of these various tests are being reported, but the specific results of the hair oil test are not clearly distinguished from the other product tests.