Four studies found no significant difference in serum or plasma serine levels between children and adults with or without autistic disorder, PDD-NOS, Asperger's Syndrome or autism spectrum disorders (mixed sample) [ 60 , 69 , 70 , 75 ], one study showed a trend towards a decrease in children with autistic disorder [ 60 ] and another reported significantly increased plasma serine in children with autism spectrum disorders [ 87 ] and significantly lower levels of serine were reported for platelet poor plasma in autism spectrum disorders [ 86 ].
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The potential role of the antioxidant and detoxification properties of glutathione in autism spectrum disorders: a systematic review and meta-analysis.
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