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Vitamin D and Immunity, Lots of Evidence

3 videos recommended on HN
YouTube
2 HN users recommended this explainer2 months2020–2021 score 2
Years with an HN recommendation, 2007–2026

Cited in COVID-era threads as a physician's evidence-based argument that vitamin D is cheap, low-risk and worth considering.

Dr. John Campbell reviews studies on vitamin D deficiency and immunity, including links to influenza and COVID-19, with Public Health England advice. He walks through the sources he cites.

“It's cheap and has minimal downside.” (HN, 2020)

2 recommendations · 4 citations · Explainers · partly dated

6 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@Zenst Apr 2020 Recommends
on HN thread How the Anti-Vaccine Community Is Responding to Covid-19
Sure it's a correlation, in much the same way SAD syndrome more prevalent the further North you go. But some things may well have better papers or links, I was just pointing out what seems to be logical - however - watch this please: [this video] A Doctor who has been doing a fair and most excellent overview with a critical mind upon this whole COVID-19 from early on and focused upon evidence. He covers things in a way that may hold more gravitas to that aspect. One of the many useful reference links from that video that I think covers all this fair and square. [link]
Evidence-focused doctor's overview of Covid-19 and vitamin D.
@throwaway829 May 2020 Recommends
on HN thread Vitamin D and Inflammation: Potential Implications for Severity of Covid-19
I doubt anyone here thinks it's some kind of magic, but if you've been following the pandemic from the beginning, you've probably seen these two doctors who both recommend vitamin D: - Dr. Seheult's: [link] - Dr John Campbell: [this video] It's cheap and has minimal downside. Pre-covid it was already known to "reduce symptoms of colds or influenza"[0]. [0] Benefits of Vitamin D Supplementation - Journal of American Physicians and Surgeons [link]
Doctor recommending vitamin D, cheap with minimal downside.

Citations, criticism and jokes

@fattire May 2020 Cites it
on HN thread Vitamin D looks powerful, underutilized for Covid-19
Dr. John Campbell, an educator in Northern England who's been doing daily Youtube updates on Covid news since January I believe, has put out a few videos from time to time related to vitamin D: [link] - A month ago [this video] - 3 weeks ago [link] - 3 days ago He suggests vitamin D deficiency may play a partial role in explaining higher mortality rates among people with darker skin (other important social disparities notwithstanding).
One of several videos on vitamin D deficiency and mortality.
@fattire May 2020 Cites it
on HN thread Role of Vitamin D in the prevention of Coronavirus 2019 infection and mortality
Posted this previously when the subject came up, but John Campbell, an nurse and educator in Northern England who's been doing daily Youtube updates on global Covid news since January I believe, has put out a few videos from time to time related to vitamin D: [link] - 2 months ago [this video] - 4 weeks ago [link] - 1 week ago [link] - 4 days ago [link] - today He offers published studies as evidence to suggest vitamin D deficiency may play a partial role in explaining higher mortality rates among people with darker skin (other important social disparities notwithstanding).
One of several videos citing studies on vitamin D deficiency.
@andruby Nov 2021 Cites it
on HN thread The Impact of Vitamin D Level on Covid-19: Systematic Review Meta-Analysis
He's actually been talking about Vitamin D since April 2020 [0] and discussed the encouraging first clinical trial in September 2020 [1]. There are plenty of published studies on Vitamin D and its effects on Covid. I don't understand why healthcare guidelines don't mention or promote it more. The only reason I've come up with so far is that the pharmaceutical companies don't focus on it since there is no money to be made. Vit. D is basically free (€4 for a year's supply of 20 mcg/day). Without the push and lobbying from Pharma, I guess it doesn't get enough attention? [0] [this video] [1] [link]
Early discussion of vitamin D from April 2020.

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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