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Your body needs vitamin D to absorb calcium. Calcium keeps your bones and muscles—including your heart—healthy and strong.
People who do not get enough calcium and vitamin D throughout life have an increased chance of having thin and brittle bones (osteoporosis) in their later years. Thin and brittle bones break easily and can lead to serious injuries. This is why it is important for you to get enough calcium and vitamin D as a child and as an adult. It helps keep your bones strong as you get older and protects against possible breaks.
Your body also uses vitamin D to help your muscles absorb calcium and work well. If your muscles don't get enough calcium, then they can cramp, hurt, or feel weak. You may have long-term (chronic) muscle aches and pains. Getting enough vitamin D helps prevent these problems.
Children who don't get enough vitamin D may not grow as much as others their age. They also have a chance of getting a rare disease called rickets, which causes weak bones.
Your body needs vitamin D to absorb calcium, but you do not have to take calcium and vitamin D at the same time. For the best absorption of calcium, make sure you get enough vitamin D.
Vitamin D recommendations vary from province to province. Talk with your doctor about how much vitamin D you need.
Recommended calcium intake (milligrams a day)
Recommended vitamin D intake (international units a day)
Infants 0–6 months
Infants 7–12 months
Males 51–70 years
Females 51–70 years
71 and older
*Adequate intake rather than recommended dietary allowance (RDA)
Talk with your doctor about how much and what sources of supplements are right for your child. Although breastfed babies get the best possible nutrition, they need vitamin D supplements to maintain or improve their health. Vitamin D for babies is usually a liquid supplement that you add to a bottle of breast milk with a dropper or drip into your baby's mouth.
Women who are pregnant or breastfeeding need the same amount of calcium and vitamin D as other women their age.
Health Canada and Osteoporosis Canada recommend that Canadian adults take daily vitamin D supplements.footnote 1
Many foods are fortified with calcium and vitamin D, and your body uses sunshine to make its own vitamin D. From age 9 through 18, girls need more calcium from foods to meet the daily recommended intake. If they cannot get enough calcium from foods, a calcium supplement may be needed.
Many Canadians don't get enough vitamin D from food and sunshine only. If you are diagnosed with osteoporosis, it's more important to get enough calcium and vitamin D. Talk to your doctor about how you can get the right amount through supplements and what you eat.
Things that reduce how much vitamin D your body makes include:
Calcium is in foods such as milk, cheese, and yogurt. Vegetables like broccoli, kale, and Chinese cabbage have calcium. You can get calcium if you eat the soft edible bones in canned sardines and canned salmon. Foods with added (fortified) calcium include some juices, soy drinks, and tofu. The food label will show how much calcium was added.
Calcium supplements are available as citrate or carbonate. Calcium carbonate is best absorbed when it is taken with food. Calcium citrate can be absorbed well with or without food. Spreading calcium out over the course of the day can reduce stomach upset and helps your body absorb the calcium better. Try not to take more than 500 milligrams (mg) of calcium supplement at a time.
Since we can't get enough vitamin D from food to meet our body's needs, Alberta Health Services recommends that all healthy Albertans take a vitamin D supplement. Some people (like those at risk of osteoporosis) need higher amounts of vitamin D.
The most common kind of vitamin D found in supplements in Canada is cholecalciferol (D3).
It is possible to get too much calcium and vitamin D. Older women who take calcium supplements need to be careful that they do not take too much.
The amount of calcium and vitamin D you get every day from all sources—including food, sunshine, and supplements—should not be more than the amount shown by age in the table below for "upper level intake." Upper level intake does not mean that most people need this amount or should try to get it. It means this is the maximum amount of calcium or vitamin D that is safe to take.
Upper level calcium intake (milligrams a day)
Upper level vitamin D intake (international units a day)
51 and older
If you get too much calcium, you may get kidney stones, and if you get too much vitamin D, your kidneys and tissues may be damaged.footnote 1 Too much calcium can cause constipation. Too much vitamin D can cause nausea and vomiting, constipation, and weakness.
Getting too much vitamin D increases the amount of calcium in your blood. If this happens, you can become confused and have an irregular heart rhythm.
Calcium and vitamin D may interact with other medicines. A drug interaction happens when a medicine you take changes how another medicine works. One medicine may make another one less effective, or the combination of the medicines may cause a side effect you don't expect. Some drug interactions are dangerous.
Before you start taking calcium and/or vitamin D, tell your doctor about all of the medicines you take, including over-the-counter drugs, herbs, and pills. Also tell your doctor about all of your current medical problems.
CitationsHealth Canada (2010). Vitamin D and calcium: Updated dietary reference intakes. Available online: http://www.hc-sc.gc.ca/fn-an/nutrition/vitamin/vita-d-eng.php.
Adaptation Date: 8/18/2021
Adapted By: Alberta Health Services
Adaptation Reviewed By: Alberta Health Services
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