Long-Chain Omega-3 Fatty Acids Are Conditionally Essential Substrates in Children: Effects on Visual Function in Children with Phenylketonuria 4 min read / 30.01.2012 Long-Chain Omega-3 Fatty Acids Are Conditionally Essential Substrates in Children: Effects on Visual Function in Children with Phenylketonuria (full doc) Save (for later) Berthold Koletzko About Author Share