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10.1016/j.yrtph.2012.04.008 Regul Toxicol Pharmacol

doi: 10.1155/2015/101468

It may still be safe, but potency and purity could be compromised

Laboratory tests showed a significant zinc deficiency (15 mcg/dL) compared to the normal range (50.0120.0 mcg/dL)

10.1016/S1096-7192(02)00169-5

Blomstrand E, Saltin B
