How Long Does Cystine Last? Understanding Its Shelf Life and Stability
                                
                                
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                                    4 min read                                
                            
                                According to chemical stability data, cystine is significantly more stable than its reduced form, cysteine. This relative stability is key to understanding how long does cystine last in various conditions, from a dietary supplement to a laboratory reagent. While the oxidized dimer is inherently robust, its shelf life is not indefinite and is governed by specific environmental factors.