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10.3390/antiox12061232 [DOI] [PMC free article] [PubMed] [Google Scholar] 58.Zeini S, Davoodian N, Kazemi H, Shareghi Brojeni M, Ghani E, Arab Firouzjaei M, et al

This represents a gap in the evidence base that researchers should acknowledge when making decisions about protocol adoption

(Source 2, 3) "The primary downside of iron supplementation is the high rate of potential side effects, particularly gastrointestinal side effects, including nausea, vomiting, and constipation." Potential Side Effects of Iron Iron supplements, especially when taken without food on an empty stomach, can sometimes cause side effects such as constipation, nausea, stomach cramps, or a metallic taste-especially with traditional forms like ferrous sulfate

Aliment Pharmacol Ther 2017