I take vit c500mg, vit d3 1000iu, vit b12 100mcg, folic acid 1mg a2. do i take them all at once? how many of each do i take and how far apart do i take

See below: It's ok to take these together. Vit d is better absorbed after a meal. For the others it shouldn't matter.I advise at least 1000 mg of vit c 2x/day- it doesn't stay in your body for long! i advise 4000-5000 iu vit d from sept. To april (you can find pills with 5000 units). During spring & summer don't need if you spend time in mid-day sun.Consider a full b complex & taking vit k with d. What's a2?