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The effectiveness of a morning versus evening oral iron supplement strategy to increase iron stores was explored. Ballet and contemporary dancers with serum ferritin (sFer) &lt; 50μg/L (n = 14), were supplemented daily with 105 mg elemental oral iron in either the morning (Fe AM ) or evening (Fe PM ) for 8 weeks. A control group (n = 6) with sFer &gt;50μg/L were given no supplement over the same period. Dancers’ sFer were measured at baseline and post‐intervention. Assessment of daily training load, dietary intake, and menstruation were made. A significant interaction ( p  &lt; 0.001) showed the within group sFer change over the 8‐week intervention in Fe AM  (+25.9 ± 10.5μg/L) and Fe PM,  (+22.3 ± 13.6μg/L) was significantly different to CON (−30.17 ± 28.7μg/L; both  p  = 0.001). This change was not different between Fe AM  and Fe PM  ( p  = 0.778). sFer levels within Fe AM  and Fe PM  significantly increased over the 8‐weeks; however, they significantly decreased in the CON group (all  p  &lt; 0.05). Post‐intervention sFer levels were no longer different between the three groups ( p  &gt; 0.05). Training load, dietary intake, and number of menstrual cycles incurred were similar between Fe AM  and Fe PM  ( p  &gt; 0.05). Oral iron supplementation in either the morning or evening appears equally effective in increasing sFer levels in dancers with sub‐optimal iron status.

Timing is everything, but does it really matter? Impact of 8‐weeks morning versus evening iron supplementation in ballet and contemporary dancers