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Men with Low T often have low vitamin D levels.  This study found better results with calcidiol versus cholecalciferol in raising 25-hydroxyvitamin D.

Cholecalciferol (vitamin D3) was found to increase male Testosterone production in cell culture model.  This fits with other data that low vitamin D and low T often go hand in hand.  This study actually shows improved D levels increase Testicular Testosterone production, though in cell culture.

This study is misleading.  Their conclusion is that D2 and D3 are equivalent in raising 25-OH vitamin D via po form preferentially over the IM form. However, when you look at the results, the response of D3 was statistically significant over that of D2.  That is the conclusion: vitamin D3 is the optimal form of vitamin D.

Long term high dose Vitamin D proven to be effective.  No toxicity.

High dose vitamin D (10,400 IU) found to reduce IL-17, CD161 and effector memory cells; in contrast low dose vitamin D (800 IU)  did not.  The study also called into question the traditional target range of vitamin D.  The authors here proposed 40-60

Not only is high dose vitamin D3 therapy more effective in reducing IL-17 compared to low dose, but it is safe to in individuals with MS.  The hot topic these days is immunotherapy: that is exactly what vitamin D therapy is.