Mealtime best. Stomach acid increases calcium absorption (that is why ppl on acid blockers for heartburn have a harder time absorbing calcium). When we eat meals, our stomachs make more acid so we should take calcium at meal times. Not sure about coffee though. And watch out about other meds- calcium can alter the absorption of other meds.
Calcium and coffee. Most calcium supplements work best taken between meals and between coffee intake.
See below. To answer I drink two large cups of coffee early morning and then take the calcium supplement my calcium levels are normal and my bones are healthy -s from personal experience I would say coffe does not hurt the absorbence of calsium.
Should not matter. The fact that you have coffee, possibly with a milk product, in your system should not affect your ability to absorb the calcium.