Recent Blog Articles
Can mindfulness change your brain?
Five lifestyle factors that can help prevent gastroesophageal reflux disease
Transient ischemic attacks: Varied symptoms, all important
5 inflammation-fighting food swaps
Is IBD an underrecognized health problem in minority groups?
Sickle cell disease in newborns and children: What families should know and do
COVID-19 vaccines for children and teens: What we do — and don’t — know
Happy trails: Take a hike, now
Sleep well — and reduce your risk of dementia and death
COVID-19 vaccines and the LGBTQ+ community
By the way, doctor: Am I taking too much vitamin D?
Q. I take Fosamax with vitamin D and a multivitamin that contains vitamin D. Now I see my calcium tablets also have vitamin D in them. Am I in danger of getting too much of this vitamin?
A. This is a complicated issue, because there's some disagreement over the optimal daily intake for this vitamin. There's no question that vitamin D is essential for healthy bones. It promotes the absorption of calcium and phosphorus from the intestines — a fundamental step in bone growth and repair. Adequate vitamin D is especially important for women who have osteoporosis or are at risk for it. Studies also suggest that vitamin D bolsters the immune system and in sufficient doses helps prevent certain forms of cancer. In September, researchers reported finding a link between vitamin D supplementation and reduced mortality (see "Lower death rate in vitamin-D takers").
To continue reading this article, you must log in.
Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.
- Research health conditions
- Check your symptoms
- Prepare for a doctor's visit or test
- Find the best treatments and procedures for you
- Explore options for better nutrition and exercise
I'd like to receive access to Harvard Health Online for only $4.99 a month.Sign Me Up
Already a member? Login ».
As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update 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.