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Where blood-based biomarkers are used then assumptions are blood volume and in the case of albumin bound biomarkers the albumin concentration may be relevant

Cytokine 12 : 986991 Komatsu M, Takahashi T, Abe T, Takahashi I, Ida H and Takada G (2001) Evidence for the association of ultraviolet-C and H2O2-induced apoptosis with acid sphingomyelinase activation

Some studies indicate that it may improve memory and attention, as mentioned in a clinical trial assessing driving ability [71]

These include sarcoidosis, high phosphate blood levels, high calcium blood levels, excessive vitamin D levels, arteriosclerosis with occlusion of the arteries, kidney stones, kidney disease with reduced kidney function, and allergies to vitamin D

This data strongly supports the hypothesis that restoring redox balance is a viable therapeutic target for the profound brain fog seen in post-viral syndromes