Is there any evidence for magnesium sprays or supplements for kids sleep?

What the evidence says

Magnesium is a mineral your body needs for muscles, nerves, and many other jobs. Some people believe it helps with sleep, so magnesium sprays, creams, and pills are sold for this. But when scientists actually looked, the proof is much weaker than the marketing suggests.

In adults, a few systematic reviews (studies that combine many trials) looked at magnesium pills for sleep problems. One review found sleep onset time improved slightly, but the studies were small and had a high risk of bias, meaning the results are not very trustworthy. Another review of magnesium for anxiety and sleep found only a handful of usable trials, with mixed results, some showing no benefit over a fake pill.

For magnesium sprays or creams rubbed on skin, the science is even shakier. A detailed review looked at whether magnesium can actually pass through skin into the bloodstream and concluded that the claims are not well supported by real evidence, since skin mostly blocks it except in tiny areas like hair follicles and sweat glands. One small pilot study did find a slight rise in blood magnesium after using a magnesium cream, but the effect was small and the study did not look at sleep.

We found almost no research testing magnesium, oral or topical, for sleep in healthy children specifically. One older paper looked at magnesium alongside vitamin B6 in children with autism and found improvements in sleep and behaviour in a small pilot study, but this does not tell us anything about typically developing kids having trouble sleeping.

A UK children's health service also points out that most kids already get enough magnesium from foods like whole grains, nuts, beans and leafy greens, so healthy children usually do not need extra magnesium at all. If your child is struggling to sleep, it is worth talking to your doctor about sleep habits and ruling out other causes before trying supplements.