[puttycat]

I started taking vitamin D supplements (D3 pills) after getting a blood test with below norm vitamin D level. Saw an immediate improvement in concentration, mood and energy throughout the day. (this is merely anecdotal, of course)

I don't see how milk itself is related though.

[red-iron-pine]

Aye, vit d in pill form is cheap and abundant. doesn't require a huge farm to produce and is stable for a lot longer than a couple liters of milk.

I take 1000-3000 IUs with dinner at night a couple times a week and sleep like the dead.