Functional tests are more accurate than just checking a level of a substance in the blood. Abnormally low function of a vitamin may occur even if the blood level is normal. Most borreliosis patients have low levels of functional vitamin activity for several different vitamins. Living cells are used for functional testing of vitamins and minerals. Minerals may also be low. Patients may feel better with supplementation. It is important to know that not all supplements are absorbed equally. Efficacy matters.
My experience has taught me that pharmaceutical grade supplements produce better results than regular or discount supplements. Whatever supplements you try, however, give them at least three months before you give up on them. If you do stop them, discontinue them one at a time and pay close attention to see if your symptoms worsen or you do not feel as good in general