They're talking about vitamin D, which accumulates due to being fat soluble and is indeed toxic at a certain level[1]

It became something of a panacea nutrient, recently around COVID.

1. https://en.wikipedia.org/wiki/Vitamin_D_toxicity

Your own link shows that what is considered toxic levels are far higher than most people would expect. Vitamin D toxicity is not that easy to accidentally hit.

Overdose has been observed at 1,925 μg/d (77,000 IU per day). Acute overdose requires between 15,000 μg/d (600,000 IU per day) and 42,000 μg/d (1,680,000 IU per day) over several days to months.

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nomel an hour ago | parent | prev | next [-]

And, if you drink a glass of carrot juice a day, you'll receive toxic levels of vitamin A!

~40% of people don't get enough vitamin D [1]. It's not useful to categorize it as some trend, based on people just not following general recommended dosing (with more precise dosing depending entirely on personal sun exposure and skin color).

edit: As an office worker, I take 10k IU per day when I'm entirely indoors (most of the time), but vary it based on sun exposure. I based this on recent studies, and have my doctors approval with an exactly center-of-the-nominal-range vitamin D serum level.

[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC9573946/

	▲	xnickb an hour ago \| parent \| next [-]
		> severe VDD was defined as serum 25(OH)D levels of <25 nmol/L, moderate deficiency as 25–50 nmol/L, insufficiency as 50–75 nmol/L, and sufficiency as >75 nmol/L. These numbers seem high to me. The 75 nmol/L (30ng/L) is not really a reliable value. It was published in a research that raises many questions due to conflict of interests. Hence the > ~40% of people don't get enough vitamin D becomes: > ~40% of people in the USA don't get enough vitamin D according to Dr. Holick Where I live the norm is 20 ng/L and if we apply that, then the shocking 40% becomes more reasonable 10-15%
	▲	_puk an hour ago \| parent \| prev [-]
		You'll also go orange [0] 0: https://drink4good.com/can-drinking-too-much-carrot-juice-tu...

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kenhwang an hour ago | parent | prev | next [-]

My doctor added vitamin D test to his patients recurring blood work since the start of COVID, and found out just about all his patients was deficient or near it.

If you don't have a primarily fish based diet or spend hours under direct overhead sunlight every day without a shirt on, you're probably deficient as well.

	▲	hungryhobbit an hour ago \| parent [-]
		That's a bit of an exaggeration, Vitamin D does not require hours in the sun: > Recommendations to Obtain Adequate Amount of Vitamin D. > Sun exposure to the face, arms, hands, and legs without sunscreen for 5 to 30 minutes at least twice a week or more between the hours of 10 am and 4 pm Source: https://pmc.ncbi.nlm.nih.gov/articles/PMC8299926/ Now that's for most people: if you live in Alaska then during the winter maybe you need a litle more or something ... but the point is most people just need a little sun, < 30 minutes twice a week.

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drop_star 2 hours ago | parent | prev [-]

I've also heard about it 'hardening' in the bloodstream and that you should really be taking it with K2 as well. This is anecdotal so someone please do more research than basing anything from this comment