In January 2019 researchers from Switzerland published their review of the medical scientific literature to assess whether fortified dairy products and cereal food had a positive impact on the health of children and adolescents (aged 5-15 years) compared with non-fortified food. A total of 24 studies (often multiple micronutrient fortification) were included in the review. Results showed a very small and non-significant increase of haemoglobin values with iron-fortified products although the studies were of very low quality. There was also no significant difference in risk of anaemia although fortified food did appear to produce a reduced risk of in iron deficiency anaemia. However, the evidence for this was again of very low quality.
Eichler K et al. Health effects of micronutrient fortified dairy products and cereal food for children and adolescents: A systematic review. PLoS One. 2019 Jan 23;14(1):e0210899.