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Calcium Rule of 300

Do you need a calcium supplement?

Before you take a daily calcium supplement, know how much calcium you are eating in your diet. Use the CALCIUM RULE OF 300.

  1. Start with the number of servings of dairy or fortified juices you get each day.
  2. Multiply that by 300.
  3. Add 300 if you eat a well-balanced diet.
  4. The total is your calcium intake from diet.
  5. Determine your RDA and add a supplement—if necessary—to reach your goal.

Note: you might be able to reach your recommended daily allowance by adding another serving of dairy or calcium-fortified juice!


The Bottom Line

Only take calcium supplements to make up the difference between what you get in your diet and your RDA.

Revised: 02/26/20. 
As a service to our readers, American Bone Health provides access to our library of archived content. Please note the date of the last review on all articles. No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician

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What to know about bone health
and fracture prevention during COVID-19

  • Remove fall dangers in your home.
  • Stay physically active, and at least 6 feet away from others.
  • Eat for proper nutrition, and take a supplement if needed to get enough calcium and vitamin D.
  • Stick with your osteoporosis medicines and ask your doctor for extra if you’re unable to go to the pharmacy.
  • If you are due for Reclast, there is little concern about delaying for a few weeks or months.
  • If you take Prolia or Evenity injections, don’t miss your appointment.  Some facilities offer “drive-through” injections. Check with your doctor.
  • Bone density testing can be postponed, if necessary.
  • Speak with your doctor about the possibility of telephone and video visits.

The Centers for Disease Control and Prevention has a page with steps you can take to reduce your risk of catching the virus if you have a chronic illness.

Be well. We are here for you if you have any questions.