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In fact, a 2019 review by Sikiric et al

Rats with thyroidectomy showed reduced absorption of oral vitamin B12, and the condition was reversed when the rats were supplemented with exogenous thyroid (Okuda and Chow, 1961)
Methionine synthase A2756G polymorphism and breast cancer risk: A meta-analysis involving 18,953 subjects

Andrade J