Facebook Pixel

Big Annual Dose of Vitamin D Backfires

By HERWriter
Rate This

You've heard the old saying, "If a little is good, more must be better." But it isn't always true. Not when it comes to taking an annual megadose of Vitamin D once a year, at any rate. Research seems to indicate that not only does it not help to take large doses, it can actually make things worse.

Older women who took an annual dose of Vitamin D were found to have a higher rate of falls and fractures.

"The study included 2,256 community-dwelling women who were older than 70 at the start of the study and who were considered to be at high risk of fractures. Women were randomly assigned to receive either an annual dose of 500,000 IUs of vitamin D or a placebo for three to five years. Both the vitamin D and the placebo consisted of 10 tablets to be taken in a single day."

One theory is that when given such high dosage of Vitamin D, the body may try to lower its vitamin levels. Dr. Michael Perskin compares it to attempting to take care of our need for protein by eating a year's worth in one day.


Add a Comment1 Comments

EmpowHER Guest

500,000 IUs of vitamin D in one day is a massive dose but spread over a year it is very little. The paper shows that all participants in this trail had suboptimal vitamin d levels most of the time, except for the treatment arm who once a year were give what I would have assumed was a toxic dose. The most impressive thing is that a dose 2500 times the RDA is safe except for a small increased risk in falling.

For safety, do not attempt to drink a years requirement of water in one day.

May 12, 2010 - 9:54am
Enter the characters shown in the image.
By submitting this form, you agree to EmpowHER's terms of service and privacy policy
Add a Comment

We value and respect our HERWriters' experiences, but everyone is different. Many of our writers are speaking from personal experience, and what's worked for them may not work for you. Their articles are not a substitute for medical advice, although we hope you can gain knowledge from their insight.


Get Email Updates

Osteoporosis Guide


Have a question? We're here to help. Ask the Community.


Health Newsletter

Receive the latest and greatest in women's health and wellness from EmpowHER - for free!