We have argued on this site that antioxidant pills lose to food, and we are not taking it back. The NIH Office of Dietary Supplements says the same thing in plainer language: people who eat plenty of fruit and vegetables have lower cancer risk, and taking vitamin C supplements does not seem to give them that protection.

Here is the exception we skipped. Vitamin C is not only an antioxidant. It is an essential vitamin with a number attached, a deficiency disease behind it, and a job your body cannot do without it.

NIH Office of Dietary SupplementsMedlinePlus, US National Library of MedicineEvery claim linked to its source

The Short Answer

Wrong as an antioxidant pill. Right as a nutrient with a floor.

The requirement is small and specific. NIH ODS sets it at 90 mg a day for men and 75 mg for women, with an extra 35 mg for anyone who smokes or lives with smoke.
Running out is not a theory. MedlinePlus describes scurvy as what happens below roughly 10 mg a day for weeks, and ODS notes plainly that scurvy is fatal if it is not treated.
More is not better, and it stops going in. The ODS health professional sheet reports absorption falling to about half or less at single doses above one gram, against an adult upper limit of 2,000 mg from all sources.

Get Your Coach's Vitamin C Plan ↓See What We Recommend →

Right button is a partner link · we may earn a commission at no extra cost to you

What the Earlier Article Got Right

It was right about the megadose story. ODS reports that vitamin C supplements do not appear to protect against cancer, that the cardiovascular picture stays unresolved, and that supplements do not stop you catching a cold. Regular use may shave a little off a cold's length, and starting a bottle once your throat hurts does nothing at all.

None of that is an argument against the nutrient. It is an argument against treating a vitamin like a drug. The two jobs ODS names for it are unglamorous and non-negotiable: your body needs it to make collagen for wound healing, and it sharply improves the absorption of iron from plant foods.

A glass bowl of fresh citrus fruit on a wooden table in a living room — Two oranges and a red pepper clear the daily requirement, which is why the interesting question is never how much more you can take.

Who Is Actually Short

Food covers it easily for most people, and cheaply: citrus, red and green peppers, kiwifruit, broccoli, strawberries and tomatoes all carry it, and the ODS fact sheets treat a varied diet as the default answer. If that is your week, you do not need this page's product.

The groups who do run short are specific. ODS names them: people who smoke or live with smoke, people eating a very limited variety of food, and people with severe malabsorption, some cancers, or kidney disease on dialysis. MedlinePlus adds that cooking and long storage strip the vitamin out of food. For those readers a capsule is a sensible floor.

Vitamin C: Three Ways People Buy It

Option	Best for	What the evidence shows	Daily effort
Fruit and vegetables	Almost everyone	Clears 75 to 90 mg without trying	Free, no capsule
A 500 mg daily capsule	Smokers, limited diets, malabsorption	Comfortably above the requirement, far below the ceiling	One capsule a day
A 1,000 mg or more megadose	Nothing we can defend	Absorption drops, side effects rise	Skip it

Verified against the sources listed below. If you are being treated for cancer, or you have hemochromatosis or kidney stones, this is a conversation with your clinician before it is a purchase.

★ Coach's Pick

The one we would buy for this job

Thorne Vitamin C with Flavonoids

If you have a reason to take vitamin C, take a dose you can defend. This is 500 mg of ascorbic acid with citrus bioflavonoids, one capsule a day, which sits well above the 75 to 90 mg requirement and nowhere near the 2,000 mg adult ceiling. Note that ODS states research has not shown any one form of vitamin C to be better than another, so the flavonoids are a formulation choice rather than a proven upgrade. It supports immune function and collagen production as structure and function claims.

500 mg of vitamin C as ascorbic acid per capsule, with citrus bioflavonoids from oranges
90 capsules per bottle, with the manufacturer's label directing one capsule a day
Roughly six times the adult requirement and a quarter of the tolerable upper intake level
Third party tested for label accuracy and contaminant limits under Thorne's published testing standard

About $0.26 a dayThat is one capsule daily from a 90 capsule bottle at the last recorded retail price. Price as of August 3, 2026, taken from a retail listing and not verified on the Thorne page tonight. Confirm the current price below.

Check Current Price at Thorne →Partner link · opens the Thorne product page

Ageless Coach may earn a commission if you buy through this link, at no extra cost to you. We only recommend products that pass our published screen, and this recommendation was set before any partnership. How we choose partners.

Before You Buy

Check what else you are already taking. The upper limit counts every source together, so a multivitamin, a greens powder and an immune blend can stack toward 2,000 mg without any single label looking excessive. Past that line come diarrhea, nausea and stomach cramps.

Three interactions deserve naming. Anyone in cancer treatment should ask their oncologist first. ODS also flags a study where antioxidants blunted a statin and niacin combination, and warns that high doses worsen iron overload in hemochromatosis. Tell every clinician what you take.

📋 Your Coach's Recommendations

Check your food before your cart.

Two servings of citrus, peppers, kiwifruit or broccoli in a day clears the requirement outright. If most days look like that and you do not smoke, you can stop reading here.

Add up every label, not just this one.

Multivitamins, greens powders and immune blends all carry vitamin C. Total everything against the 2,000 mg adult ceiling before you add a single ingredient bottle on top.

Pick a dose you can defend, then stop escalating.

500 mg a day is generous cover for a genuine shortfall. Doubling it does not double what gets absorbed, and a cold that has already started will not care either way.

Check Current Price at Thorne →Partner link · opens the Thorne product page

Not buying anything today? Good. Get the free Vitamin C Ceiling Card, the stacking check and the interaction list, sent to your inbox using the box below.

The Vitamin C Ceiling Card

Your free two page plan covers the one thing the label does not: how much you are already getting from everything else, and where the ceiling actually sits.

One email. No spam. Unsubscribe anytime.

Where should we send it?

Your free plan, straight to your inbox.

We send the plan plus one short evidence brief each week. Unsubscribe anytime.

✓

It's on the way

Check your inbox in the next minute. Want it right now?

⬇ Download your plan (PDF)

Your first Ageless Brief arrives this week: one study, translated, no hype.

Frequently Asked Questions

So does vitamin C help with colds or not?

Not for catching one. ODS states that supplements do not reduce the risk of getting a cold for most people, that regular takers may have slightly shorter or milder ones, and that starting a supplement after symptoms begin does not appear to help.

Are the bioflavonoids worth paying for?

Treat them as a formulation preference. ODS says outright that research has not shown any one form of vitamin C to be better than the others, and that includes ascorbic acid with bioflavonoids. Buy it if you like it; do not buy it expecting a different result.

Is 1,000 mg a day dangerous?

It is under the 2,000 mg adult ceiling, so it is not dangerous for most people, but it is wasteful. The dietary reference intake report describes absorption falling away as single doses climb past a gram, with the surplus excreted. Diarrhea and stomach cramps arrive before any benefit does.

Can it cause kidney stones?

High doses are the concern, not ordinary intake, and the risk signal is strongest in men with a stone history. Anyone who has had a stone, or who has hemochromatosis, should ask a clinician before taking a single ingredient vitamin C capsule, and supplements are not reviewed by the FDA for effectiveness before sale, so an independent test seal is the floor.

Sources

To your health,

By the Ageless Coach Editorial Team · August 3, 2026 · Sources fetched live at build · This page contains affiliate links; see the disclosure at the recommendation above.

This page contains affiliate links. Ageless Coach may earn a commission if you buy through them, at no extra cost to you. Educational content only; not medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

If you have a real shortfall: Thorne Vitamin C with Flavonoids

Check Price →

We Said Food Beats Vitamin C Pills. Mostly True.

Wrong as an antioxidant pill. Right as a nutrient with a floor.

What the Earlier Article Got Right

Who Is Actually Short

Thorne Vitamin C with Flavonoids

Before You Buy

The Vitamin C Ceiling Card

Where should we send it?

It's on the way

Frequently Asked Questions

Sources

Your Coach's Plan

We Said Food Beats Vitamin C Pills. Mostly True.

Wrong as an antioxidant pill. Right as a nutrient with a floor.

What the Earlier Article Got Right

Who Is Actually Short

Thorne Vitamin C with Flavonoids

Before You Buy

The Vitamin C Ceiling Card

Where should we send it?

It's on the way

Frequently Asked Questions

Sources

Subscribe to the Free Newsletter

Share this Article:

Your Coach's Plan

More Science. Less Noise.