all i can suggest is to find some academic research on the subject, and contact the corresponding authors. if you can't find a uk-based study, you could ask the authors if they know of anyone in the uk who could help. use the corresponding author email address only. hope that does some good..
odd sx? no dx? check w/ dietitian
DRI=MINIMUM eg bit.ly/1vgQclQ
99% don't meet these. meds/lifestyle can affect levels
status can be low in ms & other cond'ns
'but my results are normal'. typical panels don't test all
deficits occur in 'normal' range