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Selenium is not included in some products and you may wish to take an additional supplement or ensure you get enough from the food you eat (read: Brazil nuts)
& Kaplan, M
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Analytical verification requires reverse-phase HPLC with UV detection at 214-220 nm to confirm retention time consistency and peak purity above 95%, while mass spectrometry (MALDI-TOF or ESI-MS) can confirm the expected molecular ion at 1419.53 Da and identify any truncation or oxidation products
Kang SS, Passen EL, Ruggie N, Wong PWK, and Sora H (1993)
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