There's no scientific evidence about whether they work, but that's about to change, thanks for a new study by researchers at UC Santa Cruz and the UC Davis MIND Institute.

Are fidget spinners effective?

Using Fidget Spinners for Stress Relief. ... They're also touted as extremely beneficial, with makers claiming gains such as increased concentration for those with ADHD and autism spectrum issues, and relief from stress, anxiety, and even post-traumatic stress disorder symptoms.

Do fidget spinners help you focus?

Objects such as squeeze balls or stress balls require that the individual do the movement. By physically engaging in movement, focus on other tasks may improve. But with fidget spinners, once that first spin is made, the child is no longer making a movement. ... So, no, fidget spinners don't boost kids' concentration.