Mind & Body · Thursday, 3 September 2026

01 Briefing what happened

Your body cannot make vitamin C. The broken gene is still in there, missing five of its twelve pieces.

Mind & Body 1 min 60 sources

Almost every mammal builds its own vitamin C. Primates lost the last enzyme, so a shortage that takes months to appear still puts people in hospital - and the amount a healthy body needs was never really measured.

5 of 12

sections missing from the human gene for making vitamin C

the remnant is still on chromosome 8 and is broken in every primate [2]

10 of 40

mg a day that stops scurvy, out of the 40 mg Britain recommends

the 40 mg was set in 1991 from a 1953 study of what prevents the disease [5]

280

adult scurvy cases published since 2000

a review in February 2026 found most were investigated for autoimmune or bleeding disorders first [4]

1,500 mg

of vitamin C in the entire body, with no reserve tank

the kidneys clear whatever is above that, so a gap of weeks empties it [1]

The lead story — what happened

Almost every mammal makes its own vitamin C. Humans and the other primates cannot, because the gene for the final step is broken. [2]
The broken gene is still in the human genome. It is called GULOP, and it is missing five of the twelve working sections a rodent's version has. [2]
That is what makes vitamin C a vitamin. A vitamin is only a vitamin for a body that cannot build the thing itself. [7][2]
The word came from a guess. Casimir Funk coined vit-amine in 1912 for substances he thought were vital and were amines; he was wrong on the chemistry. [7]
The body cannot store it either. The whole body holds about 1,500 mg, and the kidneys clear the surplus, so the supply has to be near-continuous. [1]
Vitamin C's main job is not to be a building block. It is a helper that keeps two enzymes working while they build collagen. [3]
Collagen is the body's main structural protein. It is a quarter to a third of all the protein a person is made of. [38]
A collagen molecule is three chains wound into a rope. The rope only holds if certain links along each chain are chemically altered first. [3]
Two enzymes do that altering: prolyl hydroxylase and lysyl hydroxylase. Both need vitamin C to keep running. [3][13]
Without it the triple rope forms badly. The collagen wrapped around the smallest blood vessels goes weak, and they leak. [1]
That is scurvy: swollen and bleeding gums, loose teeth, bleeding under the skin, and wounds that will not heal. [48] The giveaway sign is bleeding around each hair follicle. [20]
It is slow. One to three months of almost no vitamin C pass before the first signs show. [1]
It is also fast to reverse. In published cases, the skin and gum signs clear in days to a couple of weeks once vitamin C is given. [1][16]
Ten milligrams a day is enough to prevent it. That number comes from a study done in Sheffield in 1953. [5]
Britain's official recommendation is 40 mg a day, set in 1991 and built on that 1953 figure. [5]
The United States recommends 90 mg a day for men and 75 mg for women - more than twice Britain's number for the same species. [1][5]
A 2026 commentary argues the British figure ignored evidence that already existed, including six trials in people already getting 40 mg or more. [5]
Smokers are told to add 35 mg a day, because burning tobacco raises how fast the body uses it up. [1]
More than about 200 to 400 mg at once does not get in. The gut's carriers saturate, and the extra leaves in urine. [1][6]
Scurvy is not history. A review published in February 2026 counted 280 adult cases in the medical literature since 2000. [4]
Almost none of them were spotted quickly. The typical case is a long hunt for an autoimmune or bleeding disorder that was never there. [4]
The people it reaches now are not sailors. They are people with eating disorders, psychosis, autism, homelessness, or an appetite that a drug has shut down. [11][12][13][14]
The best test of the cold claim is recent and large. A network analysis of 107 trials in 101,751 adults found the things that cut respiratory infections were catechin and probiotics, not vitamin C. [24]
Big doses are not free. In more than 23,000 Swedish men followed for 11 years, reported in 2013, supplement users had twice the rate of kidney stones. [21]
Very high doses also break blood tests. Ascorbate interfered with lactate, lipase, cholesterol, triglyceride and several glucose readings in a 2026 laboratory study. [23]

Who is involved

GULOP

the broken human gene; in most mammals its working version makes the enzyme for the last step of building vitamin C, and in people it makes nothing [2]
Prolyl and lysyl hydroxylase

the two enzymes inside your cells that finish collagen before it is sent out; they stall without vitamin C [3]
Casimir Funk

the biochemist who named vitamins in 1912, from a substance he believed cured beriberi and did not [7]
Linus Pauling

the Nobel-winning chemist whose campaign for large doses shaped most of what people still believe about vitamin C [21]
Britain's Panel on Dietary Reference Values

the expert group that fixed the 40 mg a day figure in 1991; it has not been revised since [5]

What is pushing on this

Scurvy turning up again Building↑

280 adult cases published since 2000, most missed at first [4]

Doses sold above what the gut takes High→

absorption saturates around 200-400 mg and tablets carry ten times the daily need [1][21]

Evidence behind the cold claim Easing↓

a 107-trial analysis in 101,751 adults put vitamin C nowhere near the top [24]

Interest in it as a drug, not a nutrient Building↑

sepsis and cancer trials run at doses thousands of times the diet's [30][33]

How it unfolded

1500 BC the symptoms of scurvy are described [1]
1912 Casimir Funk names the missing dietary factors vit-amines; neither half of the word held up [7]
1953 a study in Sheffield finds 10 mg a day prevents scurvy [5]
1991 Britain sets its recommendation at 40 mg a day, built on that finding [5]
Feb 2026 a review counts 280 adult scurvy cases published since 2000 [4]

Where this points

Watch whether Britain's 40 mg figure gets reopened - the 2026 commentary is the first serious push at a number set in 1991, and nothing has been re-measured since. [5]

The rest of the day

44 more stories on this beat.

Each with its own sources. None of these is a link to the story above.

02
Five weeks of tests, then a look at his plate

A three-year-old had fever, swelling, bone pain and pinpoint skin bleeding for five weeks. Biopsies and autoimmune tests were negative. His diet was mostly rice. [8]

Why it matters — The diagnosis was made by asking what he ate, after everything expensive had been tried.
03
Eight scurvy children in one Italian city

Two hospitals in Catania diagnosed eight young children between October 2021 and October 2023. The authors also reviewed 126 papers holding 253 further cases. [9]

Why it matters — A disease called extinct in rich countries is being found in clusters wherever someone looks.
04
Forty-six children over twenty years in Thailand

A hospital in southern Thailand found 46 children with vitamin C deficiency from 2004 to 2024. Limb pain hit 76%; 52% refused to walk. [10]

Why it matters — The first sign is often a child who stops walking, which sends doctors looking at bones.
05
Nineteen adults where the mind went first

A review of 18 reports found 19 adults with both scurvy and a psychotic illness, median age 54. In 26%, the presenting problem was psychiatric. [11]

Why it matters — An illness that changes what a person will eat becomes an illness that changes what their blood contains.
06
A lithium dose that would not take

An 18-year-old woman with autism had almost no vitamin C in her blood, and lithium levels that stayed too low however much was given. After treatment, both changed. [12]

Why it matters — It is a single case, and the authors call the drug link a hypothesis, not a finding.
07
Scurvy diagnosed in an emergency room

A 60-year-old man with unstable housing came in short of breath. He had bleeding into the roof of his mouth, bruising, and severely low vitamin C and B6. [13]

Why it matters — His diet was processed carbohydrates, which is what food costs money looks like inside a body.
08
Weight-loss drugs and a sailors' disease

People taking GLP-1 appetite-suppressing drugs are turning up with bleeding gums and easy bruising. The mechanism is not the drug but the collapse in how much and how varied the eating is. [14]

Why it matters — Any intervention that cuts food volume cuts the nutrients that ride in with it.
09
A heart pressure that was a diet problem

A woman in her late 50s had high blood pressure in her lung arteries and a weak heart output. She had a long-standing eating disorder and severe vitamin C deficiency. [15]

Why it matters — Pressures and output returned to normal within a week of vitamin supplementation, which is not how most heart disease behaves.
10
Anaemia severe enough to transfuse

A middle-aged man could not stand up. He had bleeding inside his thigh muscles, corkscrew hairs, and anaemia needing blood. His diet had been badly restricted. [16]

Why it matters — He improved within three days of vitamin C, after being worked up for a bleeding disorder.
11
Mistaken for blood-vessel inflammation, twice

A 55-year-old man with obesity and a 45-year-old woman were both worked up for vasculitis, an inflammation of small blood vessels. Both had undetectable vitamin C. [17][18]

Why it matters — Obesity is caloric plenty, and it does not rule out a missing nutrient - the report calls it hidden hunger.
12
Bleeding with normal clotting tests

A 26-year-old man with heavy bruising and thickened skin on one leg had normal results on every clotting test, and was heading for a diagnosis of unknown cause. [19]

Why it matters — International guidance already says to consider nutrition in such cases, and the case shows why.
13
The clue is visible through a lens

Dermatologists in Nepal set out the dermoscopy signs of scurvy - the pattern of bleeding around each hair follicle and the corkscrew shape the hairs take. [20]

Why it matters — A cheap handheld lens can shorten a hunt that otherwise runs to biopsies.
14
The tablet is bigger than the door

Vitamin C is taken up efficiently at low doses and saturates above roughly 200 to 400 mg. Beyond that, plasma barely moves and the kidneys clear the rest. [1][6]

Why it matters — It is why sustained-release and split doses show more than a single large tablet does.
15
Juice beat the powder in a small crossover

Twelve adults took the same 101.7 mg of vitamin C as powder, as raw fruit and vegetables, and as juice. Juice gave the highest blood exposure. [27]

Why it matters — The antioxidant activity measured afterwards did not stay raised in any of the three groups.
16
Twice the kidney stones in supplement users

Among more than 23,000 Swedish men followed 11 years, about 2% got kidney stones, and vitamin C supplement users were twice as likely to be among them. A standard multivitamin was not. [21]

Why it matters — Reported in 2013, and still the clearest measured cost of routine high-dose use.
17
Citrus in food pointed the other way

In a survey of 26,372 people, eating citrus, melons and berries daily was linked to lower odds of kidney stones, as were tomatoes and milk. [53]

Why it matters — The same nutrient looks protective in fruit and risky in a tablet, and no trial separates them.
18
Body weight beat every single food

In a population sample across Poland, being overweight or obese carried the highest rate of stones and stone-like pain, above any individual dietary item. [52]

Why it matters — It puts the supplement finding in proportion: a real effect, not the main one.
19
A reaction that makes benzene

Vitamin C and benzoic acid, a common food preservative, are both cleared by the kidneys. In poor kidney function both build up, and in the lab they react to form benzene. [51]

Why it matters — The evidence is laboratory and animal work, and the authors call the human version a hypothesis.
20
The full harm count for drip doses

A review of 74 studies covering 2,801 patients given at least 6 g a day intravenously found no consistent excess harm in blinded trials. It did find five cases of oxalate kidney injury. [22]

Why it matters — Also three cases of red blood cells breaking down in people with a common enzyme deficiency.
21
Your glucose meter can be fooled

Sodium ascorbate added to blood at up to 200 mg/dL interfered with lactate, lipase, cholesterol, triglyceride and several glucose platforms, including a bedside meter. [23]

Why it matters — A person on very high doses can get a wrong reading with nobody in the room knowing why.
22
The biggest cold study, and what won

A network analysis of 107 trials in 101,751 adults ranked nutritional supplements for preventing respiratory infections. Catechin, one probiotic species and multi-strain probiotics came top. [24]

Why it matters — Vitamin C is not among the winners, and it is the one most people buy for exactly this.
23
What the cold products actually claim

Airborne was created in the 1990s by a schoolteacher, and there is no strong evidence it prevents colds. Orange juice does not shorten one either. [25][26]

Why it matters — A cup of orange juice does carry more than a day's vitamin C, which is not the same as doing anything to a virus.
24
Sicker children had less of it

In 141 children admitted to intensive care in China with suspected sepsis, a quarter were deficient. Each step up in vitamin C level tracked with 52% lower 28-day death. [32]

Why it matters — It measures a level on arrival, so it may be marking how ill a child already was rather than causing anything.
25
A sepsis trial that moved markers, not deaths

Sixty patients in septic shock got 1 g of vitamin C a day with a statin for five days. Inflammation markers and organ-failure scores fell. Deaths did not differ. [31]

Why it matters — This gap - better numbers, same outcome - is the pattern across the whole vitamin C sepsis literature. [30]
26
In cancer research it is used as the opposite

At the concentrations only a drip can reach, vitamin C stops protecting cells and starts damaging them, and researchers are pairing it with drugs designed to exploit that. [33][34]

Why it matters — The same molecule sold as an antioxidant is being tested precisely for being a pro-oxidant.
27
The gene-reading enzyme it feeds

Vitamin C is a helper for the TET enzymes, which strip chemical marks off DNA and change which genes are read. In cells missing TET2, its effect was blunted. [35]

Why it matters — It is why vitamin C keeps appearing in blood cancer research, where TET2 is often broken.
28
Blood level tracked a measure of ageing

In 10,118 people surveyed in the United States, higher blood vitamin C went with a lower biological age score. The line flattened above 1.46 mg/dL. [36]

Why it matters — It is a snapshot, not a trial, and the flattening is the informative half.
29
The tendon trial came back negative

Thirty patients had vitamin C injections after surgery to repair a cut finger tendon. Movement and function scored better than the control group, but not significantly. [37]

Why it matters — Collagen needs vitamin C, and that is not the same as extra vitamin C building extra collagen.
30
More antioxidant, less training effect

A review of a decade of sports nutrition found high-dose vitamin C and E can blunt the body's adaptation to exercise, including the building of new mitochondria. [46]

Why it matters — The stress that a workout causes is part of the message the workout sends.
31
The smallest piece of collagen that works

Researchers identified a ratio - three glycine to one proline to one hydroxyproline - that extended life in worms and improved grip strength in old mice. In people, biological age fell 1.4 years in six months. [39]

Why it matters — The human part was an observational trial, and a review of over 60 collagen studies still calls the evidence inconsistent. [59]
32
Collagen keeps a day and a night shift

In human skin cells, genes for assembling collagen peaked in the day and genes for making and breaking it peaked at night. A 30-woman trial timed two skin treatments to match. [40]

Why it matters — It suggests when a skin ingredient is applied may matter as much as which one.
33
Too much collagen is also a disease

Fibrosis is collagen overproduction, and attempts to block the signals that drive it have failed. Researchers are now targeting the chemistry that supplies the raw material instead. [41]

Why it matters — The same protein whose shortage causes scurvy causes organ scarring in excess.
34
Flies choose vitamin C when overheated

Fruit flies under heat stress or kept awake selectively ate antioxidants, including vitamin C. Pre-feeding it removed the craving, and the preference did not run through known taste receptors. [44]

Why it matters — Something inside the animal is reading its own chemistry and steering what it eats.
35
A version of vitamin C that keeps

Goji berries contain the only stable natural derivative of vitamin C, which survives heat and light and is broken back down to the active form inside the body. [45]

Why it matters — Ordinary vitamin C degrades with air, heat and light, which is half the problem with fortifying food.
36
The liposome question got a trial

Twenty Korean adults took liposomal and ordinary multinutrients in a crossover trial. Vitamin C levels were significantly higher from one to eight hours with the liposomal version. [47]

Why it matters — It is a small study on a claim that is usually made with none at all.
37
The job it does for iron

Iron from plants is absorbed poorly. Vitamin C improves how much of it gets in, while the tannins in tea reduce it. [29] In 96 adults with iron-deficiency anaemia, plant iron plus 90 mg of vitamin C did better than the same iron alone. [28]

Why it matters — The vitamin that builds collagen is also the one letting iron in, which is why a shortage rarely stays a shortage of one thing.
38
The anaemias iron will not fix

Anaemia is usually blamed on iron, folate or B12. A review sets out the rarer causes - vitamin C, copper, zinc, selenium, vitamins A and E - which resist all three treatments. [49]

Why it matters — A treatment that fails is sometimes evidence about the diagnosis, not the dose.
39
Hidden hunger has a size

Micronutrient shortages persist across low- and middle-income countries, driven by poverty, thin diets and weak health services, and show up as stunted growth and poor cognitive development. [50]

Why it matters — Scurvy in a rich country is a case report; the same class of problem elsewhere is a population statistic.
40
What did show up for colds

A meta-analysis of eight trials found a specific bacterium, Lactococcus lactis strain Plasma, activated a class of antiviral immune cell and reduced cold-like symptoms in healthy adults. [56]

Why it matters — Zinc shows a preventive effect in children too, while echinacea's trials carry real bias concerns. [55][54]
41
The drip clinic question

Intravenous vitamin drips deliver high doses straight into the blood, bypassing the gut limit entirely, and the practice is growing. Cleveland Clinic ran a whole episode weighing whether it is worth it. [57]

Why it matters — The gut's ceiling is the only honest selling point these clinics have, and it is a real one.
42
Vitamin C's status in cancer care

A review of vitamins and minerals in cancer notes that patients are often deficient because of the disease and its treatment, and that correcting shortages is a different question from dosing. [58]

Why it matters — The evidence for fixing a deficiency is not evidence for a megadose.
43
Tried on a stubborn mouth disease

Oral lichen planus is a long-running immune inflammation of the lining of the mouth. A review sets out why vitamin C is biologically plausible as an add-on and how thin the trial evidence is. [42]

Why it matters — Plausible and unproven is the honest label on most of vitamin C's proposed extra jobs.
44
Common shortage across autoimmune disease

A review across multiple sclerosis, rheumatoid arthritis, type 1 diabetes and others found low vitamin C is common in these conditions, with few large randomised trials of correcting it. [43]

Why it matters — A nutrient can be low because of an illness, not the reason for it, and this literature cannot yet tell them apart.
45
Vitamin E's hundred-year version of the same story

Vitamin E was discovered in 1922 and is still being reclassified, with its link to chlorophyll breakdown identified only recently and production now moving to engineered microbes. [60]

Why it matters — A century after a vitamin is found, the basic question of what it does can still be open.

02 Lesson why it matters

The number that stops the illness is not the number that means well

Ten milligrams a day stops scurvy, so forty became the official amount, and a floor set against a disease ended up answering a question nobody measured.

The twist

A limit measured to stop a disease gets read as the amount that makes you well, and those are two different measurements with one number standing for both.

How it works

A shortage of one thing causes one clear disease
Someone measures the smallest dose that prevents it
That answers a narrow question: how little can a body get away with
The number is published as the recommended amount
The harder question - how much a body working well wants - is never funded
So the floor stands in for the answer, and everyone argues over it

Where you've seen this

School exams

a pass mark tells you who is not failing, and gets read as who is doing well

Sleep

the hours before people start making mistakes get quoted as the hours a person needs

Minimum wage

the least a job may legally pay turns into what the job pays

The catch

The floor is not a mistake - 10 mg a day is real, and it ends the disease in days. And more is not automatically better: above a few hundred milligrams the gut stops taking it in and the rest leaves in urine.

And the whole of it

Almost every number a person lives by is the answer to a question somebody chose to ask. The question asked first is usually the one with a disease behind it. By the time the number reaches you, it has stopped looking like an answer and looks like a fact about your body.

03 Truth what's really going on

What is really going on

Vitamin C is settled at the bottom of its range and wide open above it, and almost all the selling happens in the part that is open.

Why it works on us — One dramatic disease attached to a nutrient makes every dose of it feel protective, so a tablet that cannot prevent a cold still feels like insurance against something.

Who gains

Supplement makers — Harvard Health reported vitamin C as the single biggest category of vitamin and mineral sales, and a tablet routinely carries ten times or more the daily requirement. [21]
Intravenous vitamin clinics — Going straight into the blood is the one thing a drip does that a tablet cannot, because the gut's carriers saturate. That limit is their entire selling point. [1][57]
Researchers testing it as a cancer drug — At drip concentrations it flips from protecting cells to damaging them, which makes it a candidate drug rather than a nutrient. [33][34]
Collagen drink and powder sellers — Every finding that vitamin C is needed to build collagen reads in a shop as an argument for buying collagen, which is a different molecule entirely. [3][59]

Who pays

People on severely narrow diets — Published scurvy now clusters in eating disorders, psychosis, autism, homelessness and appetite-suppressing drugs. [11][12][13][14]
Patients investigated for the wrong disease — The case reports repeatedly describe skin biopsies and autoimmune workups before anyone asked what the person had been eating. [4][17][18]
Anyone on very high doses having blood tested — Ascorbate interferes with several glucose platforms and other assays, so a reading can be wrong with nobody in the room knowing why. [23]
Children in households without fresh food — Of 46 children diagnosed at one Thai hospital, 73% were not eating enough fruit and vegetables, and 52% had stopped walking. [10]

What nobody knows yet

Open questions from across today’s stories — ours included.

01

How much vitamin C a healthy body actually needs.

Britain says 40 mg a day and the United States 90 mg for men, and the British figure traces to a 1953 study of what merely prevents scurvy. [1][5]
02

Whether high-dose vitamin C helps in sepsis.

Trials keep splitting: one 60-patient trial moved inflammation markers and organ-failure scores without changing who died. [30][31]
03

Whether low vitamin C in critically ill children causes harm or just marks it.

The 141-child study measured levels on arrival, which cannot separate a cause from a sign of how ill a child already was. [32]
04

How many scurvy cases never reach a journal.

The figure of 280 counts adult cases published since 2000, which is a count of write-ups, not of people. [4]
05

Whether the supplement or the fruit explains the kidney-stone findings.

Supplement users in a 2013 Swedish study had double the stone rate, while a survey of 26,372 people linked daily citrus to fewer stones. [21][53]
06

Whether collagen supplements do anything measurable.

One trial reports biological age down 1.4 years in six months; a review of more than 60 studies calls the evidence inconsistent. [39][59]
07

What years of very high blood levels do.

Almost all high-dose work is short trials in ill patients, and the harm review found scattered serious events with no pattern to them. [22]

04 Hope carry this

A three-year-old spent five weeks with fever, bone pain and bleeding gums, and had biopsies looking for a bone disease that was not there. He had been eating almost nothing but rice; on vitamin C, the gums, the skin spots and the swelling cleared in one week.