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Genisel M, Erdal S, Kizilkaya M (2015) The mitigating effect of cysteine on growth inhibition in salt-stressed barley seeds is related to its own reducing capacity rather than its effects on antioxidant system

But, drugs like chloramphenicol might interact with it

Research indicates that intravenous, liposomal and sublingual (applied under the tongue) methods of supplementation may be better choices over oral supplementation because they are not broken down during digestion which can prevent adequate absorption

While the solution may look perfectly fine, the effectiveness of the preservative cannot be guaranteed