Studies have consistently shown that, functionally, vitamin D3 is at least 300% more effective than D2. A review of over 50 vitamin D studies also shows that vitamin D3 offers a noticeable decrease in overall mortality, significantly surpassing D2 in reducing death rates from all causes.How much vitamin D-3 should you take daily?
Sufficient: 20-30 ng/ml, or 50-75 nmol/L. Safe upper limit: 60 ng/ml, or 150 nmol/L. Toxic: Above 150 ng/mL, or 375 nmol/L.