Disordered porphyrin metabolism In News, Uncategorized by Justin WeltonApril 25, 2013 May be a potential biological marker for autism. Click here to learn more Did you enjoy this post? We post new content regularly! Click here to see our latest blog posts. Author: Justin Welton FacebookTweetLinkedInPinEmail You Might Also Like: Disordered porphyrin metabolism: a potential biological marker for autism risk assessment. Nutrient Physiology, Metabolism, and Nutrient-Nutrient Interactions Urinary porphyrin excretion in neurotypical and autistic children.