Magnesium to help toddler sleep

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Has anyone used it? We tried the Mighty Kids one but DD refused it, tasted awful so don’t blame her, she’s 2.5. Never slept through, still wakes at least 3 times in the night and fed back to sleep at each wake. Are any of the gummies any good? Do they actually work? Thank you

https://www.gov.uk/government/news/parents-and-caregivers-advised-to-stop-all-use-of-specific-brand-of-kids-magnesium-gummies-due-to-the-presence-of-an-undeclared-prescription-only-med

Would you have reason to think that she might be deficient in magnesium? If she isn’t, would extra magnesium help? I understant that supplements you don’t need are just excreted in urine.
I would guess she’s waking because of the feeding to sleep, but probably you already know this.