Vitamin D supplement
Shares rank 9 of 10 dietary supplements by recommenders
People recommend taking a daily vitamin D supplement because it is cheap and seems to improve mood, energy and illness recovery, with few known risks. Some report it made their symptoms worse or did nothing for them.
People recommend taking a daily vitamin D supplement because it is cheap and seems to improve mood, energy and illness recovery, with few known risks. Some report it made their symptoms worse or did nothing for them.
8 people gave an opinion
- recommend it
- 5
- criticize it
- 3
- approval share
- 63%
Recommended in 3 of 13 months
- November 2025: not recommended
- December 2025: not recommended
- January 2026: recommended
- February 2026: not recommended
- March 2026: not recommended
- April 2026: not recommended
- May 2026: not recommended
- June 2026: recommended
- July 2026: not recommended
- August 2026: not recommended
- September 2026: not recommended
- October 2026: recommended
- November 2026: not recommended (month in progress)
Owned for 1 year
Median of the 4 owners who said how long they have had it.
Each square is one year.
Why it doesn’t carry the badge
- 5 people recommend itNeeds 10 or more, not met.
- 1.6 recommenders for every criticNeeds 2 to 1 or better, not met.
- Recommended in 3 of 13 monthsNeeds 4 or more, not met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Improves mood and energy
“Vitamin D makes me not feel like crap, it's cheap, and effectively zero risk.”
Comment from 24 Jun 2026 in “The worthlessness of Vitamin D is mildly exaggerated” “my mood and energy sure improved. Also I feel like I get sick less often.”
Comment from 24 Jun 2026 in “The worthlessness of Vitamin D is mildly exaggerated” “when I started taking it, I felt a lot better”
Comment from 29 Jan 2026 in “Vitamin D and Omega-3 have a larger effect on depression than antidepressants” Cheap and low risk
“Vitamin D makes me not feel like crap, it's cheap, and effectively zero risk.”
Comment from 24 Jun 2026 in “The worthlessness of Vitamin D is mildly exaggerated” “I take a daily supplement, it's cheap insurance.”
Comment from 30 Oct 2026 in “I didn't know I was lacking in Vitamin D until I collapsed at work” Milder colds, fewer illnesses
“my mood and energy sure improved. Also I feel like I get sick less often.”
Comment from 24 Jun 2026 in “The worthlessness of Vitamin D is mildly exaggerated” “my cold last 2-3 days and symptoms are much more mild”
Comment from 24 Jun 2026 in “The worthlessness of Vitamin D is mildly exaggerated”
What people warn about
Each mark is one comment
Did not help some people
“I think they didn't help me a bit.”
Comment from 1 Feb 2026 in “Vitamin D and Omega-3 have a larger effect on depression than antidepressants” Possibly worsened symptoms for some
“in my case I think it might make it worse”
Comment from 9 Aug 2026 in “I Made Tinnitus My Friend (Then It Disappeared)”
Other dietary supplements people recommend
The four most recommended other dietary supplements, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Creatine monohydrate | 104 | 51 | 67% | 8 | 1 yr21 owners | Approved |
| Melatonin | 43 | 24 | 64% | 8 | — | — |
| Magnesium glycinate | 31 | 7 | 82% | 8 | — | Approved |
| N-acetylcysteine (NAC) supplement | 17 | 5 | 77% | 5 | — | Approved |
| Vitamin D supplementThis page | 5 | 3 | 63% | 3 | 1 yr4 owners | — |
What people said
All 8 comments that mention it, newest first. Each links to the original comment.
“I take a daily supplement, it's cheap insurance.”
“in my case I think it might make it worse”
“Vitamin D makes me not feel like crap, it's cheap, and effectively zero risk.”
“my cold last 2-3 days and symptoms are much more mild”
“my mood and energy sure improved. Also I feel like I get sick less often.”
“I think they didn't help me a bit.”
“when I started taking it, I felt a lot better”
“Stopped taking vit d and k2 it resolved after a week no problems”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.