Hi, just received some new results. Some weeks before I got these: GSH cellular (CD3): high end of scale (norm >650, me: 1500) B12: normal/high Holo-transcobalamin: high end of scale (norm >35, me: 90) sIgA saliva: high end of scale sIgA intestine: nearly non existent total IgE: high end of scale Today: KPU: negative (4.7 g/dl while norm is smaller 13) Methylmalonic acid: normal/low (0.69 mg/g Creatinine while norm is smaller 2) Citrulline: high (187.2 mol/g Creatinine while norm is smaller 100) It is said that citrulline is high during l-arginine or l-glutamine supplementation but I take no supplements at all. Moreover citrulline can be reduced through B12 supplementation. When arginine gets transformed to citrulline the byproduct NO is produced. Does anyone have any ideas on what tests I should do in order to find out the cause of high citrulline? Is it worth to find out why citrulline is high?