Is vitamin D3 (cholecalciferol) preferable to D2 (ergocalciferol)?

Vitamin D2 or D3

Image Credit: red11group / Flickr

I have read that D3 (cholecalciferol) is the better source of vitamin D. Can you please clarify?

Jen Ferdinand / Originally asked in Vitamin Supplements Worth Taking


Such a good question! Taken daily in doses under 2000 IU, vitamin D2 (ergocalciferol) and D3 (cholecalciferol) appear bioequivalent (meaning they both work just as well in your body). However if your physician suggests you take large intermittent doses (such as 50,000 IU weekly, then D3 is probably superior).

There’s so much new research out there that I’m working on a new video to specifically sift through all the evidence (read a recent systematic review here). Make sure you’re subscribed to my videos so you don’t miss it!

Image credit: red11group / Flickr

Michael Greger M.D., FACLM

Michael Greger, M.D. FACLM, is a physician, New York Times bestselling author, and internationally recognized professional speaker on a number of important public health issues. Dr. Greger has lectured at the Conference on World Affairs, the National Institutes of Health, and the International Bird Flu Summit, testified before Congress, appeared on The Dr. Oz Show and The Colbert Report, and was invited as an expert witness in defense of Oprah Winfrey at the infamous "meat defamation" trial.

Pin It on Pinterest

Share This