Its important to consult a healthcare professional before starting glutathione supplements, especially if you have underlying health conditions or are on prescription medications
Immunol Lett (2004) 93:3943
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Drmic D, Kolenc D, Ilic S, et al
its mainly a concern with supplement doses far above the daily requirement
The first-line test is serum vitamin B12 measurement , with levels below 148 pmol/L generally considered deficient, though the exact threshold varies between laboratories