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As the only enzyme shared between the TCA cycle and the ETC, complex II functions as a key metabolic node that directly feeds carbon and reducing equivalents into mitochondrial respiration and CoQ 10 redox cycling 75,76

But that evidence is entirely animal-based

Ali-Osman F, Akande O, Antoun G, Mao JX, Buolamwini J

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

Agarwal A, Tvrda E, Sharma R Relationship amongst teratozoospermia, seminal oxidative stress and male infertility