Care for PKU adult really needs to be improved. The good new I am e-mailing my good friends Dr. Koch and Virginia Schuett for any feedback about any questions I have. nMy Recent problem has been slightly elevated liver function tests but I have changed to a low volumn formula so I have a feeling that this might be a problem but who knows it could be the fact I am aging with PKU. There are a lot of unanswered questions with adult care. I am actually in my late 40s everyother test vitamin levels, bone density great.