Systematic Review and Meta-analysis on the Effect of Soy on Thyroid Function.

Sci Rep · 2019 · PMC6408586 · PMID 30850697

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may not be significantno p-value reported

Discussion This systematic review showed that there was a significant change in TSH as a result of soy protein and/or isoflavones supplementation though with no significant changes in fT3 and fT4 levels suggesting that whilst soy can adversely affect thyroid function, clinically this may not be significant.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.