What happens if you take too much cysteine?
                                
                                
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                                    4 min read                                
                            
                                While the body can produce cysteine from other amino acids and naturally regulates its levels, excessive intake through high-dose supplements like N-acetylcysteine (NAC) can overwhelm these systems and lead to adverse health effects. It is a semi-essential amino acid crucial for making proteins and the powerful antioxidant glutathione.