Can taking Vitamin D3 correct Vitamin D2 deficiency?

Thank you in advance for your time. My doctor tested me for Vitamin D and it and Vitamin D3 both came back at 20 ng/ML (on the borderline with existing reference range). However, my Vitamin D2 came back at <4 ng/ML - MUCH lower than the same 20 ng/ML borderline range also applicable to D2.

So, since D3 has been shown to be up to three times more potent and effective than taking D2 (which is only available from fungi and plant sources), can taking Vitamin D3 correct for my apparently serious Vitamin D2 deficiency...? I can't seem to find that answer anywhere on the internet.

Thank you,


Comments for Can taking Vitamin D3 correct Vitamin D2 deficiency?

Click here to add your own comments

No such thing as a D2 Deficiency
by: Kerri Knox, RN- The Immune Queen!

Hi Walter,

There is actually no such thing as a 'D2 deficiency'. When they draw a Vitamin D Level, the only number that is important is the Total number. As you said, only fungi and plants have D2- humans do not have D2 unless we are taking it as a supplement- and you shouldn't be taking Vitamin D2 anyway.

So, they only draw a D2 level in case someone is taking Vitamin D2- but humans do not HAVE D2 naturally. So, in reality 'Undetectable' levels of D2 IS normal. So, don't pay any attention to the D2 on your next level. It's meaningless unless you are taking D2.

BUT, you need to be sure to read my Normal Vitamin D Levels page because despite what it says on your test, a level of 20 ng/ml is NOT 'borderline', but 'deficient'. You need to follow the guidelines on the Treatment of Vitamin D Deficiency page and get your levels up to the 'optimal' range.

In fact, please go download the Vitamin D Fact Sheet so that you can get all of this information at a glance. I hope that this helps.

Kerri Knox RN Immune Health Queen

Kerri Knox, RN- The Immune System Queen
Functional Medicine Practitioner
Immune System

D2 and D3
by: Gina

I just had my vitamin D tested. The results were
Evidently, I'm in normal range.
My joints and spine hurt. I can hardly walk when I first get up in the morning. I have been low in the past. Im surprised I am not currently low.

I'm just wondering if I can get my doctor to give me prescription Vit D if I'm not really considered low. What are your suggestions for improving. I work full time and can't let this slow me down but the pain is really getting to me and I have a high tolerance for pain.

Click here to add your own comments

Return to Question About Vitamin D3 vs Vitamin D2?.


Search this Site
Custom Search


Vitamin D Fact Sheet
Free Vitamin D Fact Sheet by Getting
My Newsletter