D3 + K2 Stack

If you're looking for a basic foundation supplement that supports healthy immune function and so many other things, this is the one. D3 has been shown to strengthen bones and muscles, boost immunity, reduce inflammation, improve mood and improve heart function! K2 is required to activate osteocalcin, a protein secreted by osteoblasts, which are cells that build bone.  So you take this complex that has 5,000 IU vitamin D3 and 4,000 IU K2 and 5mg of Piperine as Bioperine, and you get a solid foundation on a budget.