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Most recently, a randomized, double-blind, placebo-controlled trial in 81 children (8-14 years) residing in the UK found that use of a daily multivitamin/mineral supplement, containing most vitamins as well as iron, copper, zinc, calcium, and magnesium, was associated with an increase in accuracy on one attention task (Arrows Flankers test) throughout the 12-week study (106)

The specific methodology is as follows: Newly acquired mice were acclimatized in the animal facility for at least one week, then placed on a metal grid for 12 h each day in the experimental room (8:00 AM-8:00 PM), and the fecal output was recorded

doi: 10.3389/fmicb.2022.979719