Effects of Oral Iron Supplementation on Blood Iron Status in Athletes: A Systematic Review, Meta-Analysis and Meta-Regression of Randomized Controlled Trials.

Meta-analysis of 13 studies with a total of 449 participants demonstrated a highly significant large increase in serum ferritin concentration after OIS (SMD = 1.27, 95% CI 0.44–2.10, p = 0.006, I 2 = 90; EXP PRE mean ± SD = 20.4 ± 10.9, EXP POST = 30.3 ± 12.4; CON PRE = 20.0 ± 10.8; CON POST = 21.5 ± 10.7) (Fig. 3 ).

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