Recent Blog Articles
I’m too young to have Alzheimer’s disease or dementia, right?
Asking about guns in houses where your child plays
Behavioral weight loss interventions: Do they work in primary care?
Who needs treatment for ocular hypertension?
The popularity of microdosing of psychedelics: What does the science say?
AFM: A scary polio-like illness
When can women with early-stage breast cancer skip radiation after lumpectomy?
Palliative care frightens some people: Here’s how it helps
The case of the bad placebo
Taking up adaptive sports
On call: Vitamin D2 or D3?
Q. After reading your article on multivitamins, I’ve decided to switch from my old multivitamin to plain vitamin D. But I’m confused by the various types of vitamin D. Which kind should I take?
A. You are wise to take vitamin D, but even wise men are likely to be confused by the complexities of vitamin D.
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.
Free Healthbeat Signup
Get the latest in health news delivered to your inbox!