Vitamin D3 10,000 IU

While this product provides a highly affordable year-long supply of Vitamin D3, it uses a tablet form which is significantly less bioavailable than lipid-based softgels. Additionally, the 10,000 IU dosage is considered a 'mega-dose' that exceeds the standard maintenance range and lacks the Vitamin K2 cofactor necessary to prevent potential arterial calcification at these high levels.