Do we need to take vitamin k2 with vitamin d3 for optimum absorption of d3?or, d3 alone is enough?

Vit D3 absorption: Wow. Excellent question! Scientific evidence shows that vit D absorption itself is not strongly influenced by vit K1 or K2 or K3. Data do show that D3 is superior to D2 in repleting D deficiency. Vit K2 importantly activates calcium uptake into bone matrix. K2 elevates osteocalcin = a "bone building" compound. K2 also elevates matrix GLA, which inhibits vasc calcification. D3 + K2 = YES!