Vitamin D2: what the studies show, and the products
15 of the human studies we graded used vitamin D2, and 2 showed an improvement. Its products are graded on the studies of every form of vitamin d. This page is educational, not medical advice.
What it does, by goalMembersThe top 5 of 12 goals
1 of these 13 human studies gave vitamin D2 by injection, not by mouth.
| Goal | What the studies show | Studies | Dose that worked |
|---|---|---|---|
| Improved in studies 2 studies, 1 showed an improvement, 1 by drip, injection or inhaler | 2 | 50,000 IU | |
| Too few studies 1 study, no clear result | 1 | – | |
| Too few studies 1 study, it found no effect | 1 | – | |
| Too few studies 1 study, it found no effect | 1 | – | |
| Too few studies 1 study, it found no effect | 1 | – | |
| Too few studies 1 study, no clear result | 1 | – | |
| Too few studies 1 study, no clear result, 1 by drip, injection or inhaler | 1 | – | |
| Too few studies 1 study, no clear result | 1 | – | |
| Too few studies 1 study, no clear result | 1 | – | |
| No effect in studies 3 studies, 1 showed an improvement, 1 found none, 1 pooled analysis | 3 | 1,000 IU | |
| No effect in studies 2 studies, both found no effect | 2 | – | |
| No effect in studies 1 study, it found no effect | 1 | – |
Members see which goal each result is for, and the products for it. Start My 7-Day Free Trial →
Products – highest ranked firstMembersThe top 1 of 1
Dose and safetyThe dose that worked and the upper limit
The studies of vitamin D2 taken by mouth that showed an improvement gave 1,000 to 50,000 IU a day.
The upper limit for adults is 100 mcg of vitamin d a day; above it, members see a note and are told they can take less.
Biohacker panelMembersWhat our 10 biohackers say about vitamin D2
Questions people askMembersAnswered from the figures on this page
What is vitamin D2 good for?
Answer for members.
How much vitamin D2 a day?
Answer for members.
Can I take vitamin D2 with my meds?
Answer for members.
Members see the answers, checked against their own meds and goals. Start My 7-Day Free Trial →
Educational, not medical advice. Figures come from the human studies on PubMed we have graded; a study counts for a form when it names the form it used. Updated as new studies arrive. How we grade →