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La Mesa, CA
A 52-year-old male asked:

is it true that a calcium supplement reduces the absorption of some vitamins and minerals (like in a multivitamin for example)? if so which ones?

1 doctor answer1 doctor weighed in
Dr. Kevin Considine
Family Medicine 30 years experience
Possibly: Yes it is true that calcium can affect absorption of some vitamins but also calcium often isn't that easily absorbed either. Remember, a lot depends on whether you are taking supplements on an empty stomach or not. Actually, it is better to take vitamins after a decent meal as the proteins and fats in food will aid in absorption of supplements and vitamins.

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Similar questions

A 45-year-old member asked:

Is it safe to take calcium and vitamin d during pregnancy?

2 doctor answers5 doctors weighed in
Dr. Scott Kramer
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Yes: Building healthy bones & teeth. While your bones provide an abundant supply of calcium for your developing baby, you can insure you're not depleted of this vital mineral by taking 1500mg of calcium and 400 units of vitamin d daily while pregnant and breastfeeding too. While many prenatal vitamins contain the later, they often don't have enough calcium. Dairy products or a supplement will suffice.
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None which work: Many popular supplements claim to boost the immune system. However scientific testing does not show they they actually work in people eating balanced diet. Oddly enough, taking too much of some supplements can actually weaken the immune system (ex. Zinc) washing your hands, eating well, exercising regularly and getting plenty of sleep is the best way to boost your immune system.
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A 21-year-old member asked:

Can a daily multivitamin alone provide the same high levels of antioxidants and zinc as the areds formulation?

2 doctor answers5 doctors weighed in
Dr. Fred Harvey
Geriatrics 37 years experience
Yes, but...: It would be tough to find. Even ones that are for eyes would be unlikely to have that level of nutrients. Some better vitamins that are 6 to 8 capsules per daily dose may contain enough.

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Last updated Oct 21, 2013

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