Which Amino Acids Are Not in Collagen?
                                
                                
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                                    4 min read                                
                            
                                Collagen, the body’s most abundant protein, is not a nutritionally 'complete' protein because it lacks one of the nine essential amino acids.  Understanding which amino acids are not in collagen and its unique profile is crucial for anyone focusing on connective tissue health, joint support, or skin elasticity.