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Nine different substances were declared or identified as undeclared PCT drugs in the samples and, in order of occurrence frequency, they were clomiphene, hCG, tamoxifen, exemestane, anastrozole, cabergoline, letrozole, mesterolone, and raloxifene (Figure 9)

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However, it can also be the result of low B6, low folate, renal failure, or hypothyroidism

Last reviewed: May 17, 2026 Last updated: May 17, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

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