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137 As a sulfur-containing amino acid, it possesses two potential binding sites for metals and is capable of binding and sequestering divalent copper (II), trivalent iron (III), lead, mercury, and cadmium ions
Because it contains caffeine, it is recommended to take it in the morning or afternoon rather than at night
In rare cases, this can lead to hypokalemia (low blood potassium), which can cause heart palpitations or muscle weakness
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