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Vitamin guide

Vitamin C

Vitamin C products range from simple, inexpensive ascorbic acid tablets to buffered powders and premium liposomal liquids. A useful comparison begins with the daily amount and your reason for considering a supplement — not the most elaborate delivery claim.

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In this guideIngredient basics, choosing & product comparison

What is vitamin C?

Vitamin C is a water-soluble vitamin, also called ascorbic acid. Fruit and vegetables are major dietary sources. Because humans cannot make vitamin C themselves, it has to come from the diet.

What does vitamin C support?

Vitamin C supports normal immune-system function and helps protect cells from oxidative stress. It contributes to normal collagen formation for skin, blood vessels, cartilage, bones, gums and teeth, helps reduce tiredness and fatigue, and increases iron absorption.

What happens if you don’t get enough vitamin C?

Severe vitamin C deficiency causes scurvy. Early symptoms can include fatigue and inflamed gums; as deficiency progresses, impaired collagen formation weakens connective tissues and can cause easy bruising, bleeding gums, joint pain and poor wound healing.

Scurvy requires very low vitamin C intake over time

Overt deficiency is uncommon where varied foods are readily available. Symptoms such as fatigue or bruising have many possible causes, so they are not a reliable way to diagnose vitamin C deficiency on their own.

What does “supports immunity” mean?

“Vitamin C contributes to the normal function of the immune system” is an authorised EU health claim. It describes a normal physiological role; it does not mean that a supplement prevents or treats colds or other infections. There is also a specific authorised claim for maintaining normal immune function during and after intense physical exercise, with its own condition of use: 200 mg daily in addition to the recommended daily intake.

What about colds?

Colds are one of the best-known consumer associations with vitamin C. Regular supplementation does not appear to prevent colds in the general population, but trial reviews have found modest reductions in cold duration. A 2023 meta-analysis also reported a reduction in the severity of common-cold symptoms in trials using at least 1 g/day.

Useful context for product content

The evidence is more supportive of a modest effect on duration or severity than of claiming that vitamin C prevents ordinary colds. For everyday supplement communication, the authorised claim that vitamin C contributes to normal immune-system function remains the clearest foundation.

Vitamin C, collagen and skin

Vitamin C contributes to normal collagen formation for the normal function of skin. This is especially useful for beauty-focused content because it links vitamin C to skin through an authorised physiological function rather than a vague cosmetic promise.

Skin is a natural vitamin C search topic

Vitamin C is widely researched in skin biology and topical skincare, but topical-serum evidence should not be treated as proof of the same cosmetic outcome from an oral supplement. For supplements, the collagen-formation claim provides the strongest evidence-led bridge to skin.

Vitamin C and iron

Vitamin C increases iron absorption. This can be relevant when a product is taken with iron or an iron-containing meal. It does not mean that everyone should add a high-dose vitamin C supplement or take iron without a reason; iron supplementation deserves its own assessment, especially when deficiency has not been established.

Do you need a vitamin C supplement?

Vitamin C occurs naturally in fruit and vegetables, and a varied diet can provide substantial amounts. A supplement may be a convenient and predictable source when intake is limited or an individual has a specific reason to use one. Need is not established by an appealing immunity message alone. In EU labelling, the nutrient reference value (NRV) is 80 mg; EFSA's population reference intakes for healthy adults are 110 mg/day for men and 95 mg/day for women.

NRV is not a personal prescription

The 80 mg NRV is a labelling reference. EFSA dietary reference values describe population needs, while individual advice can vary with diet, life stage, health and national guidance.

Ascorbic acid, mineral ascorbates or liposomal vitamin C?

Ascorbic acid

The standard form used in many tablets, capsules and powders. It is usually inexpensive and makes the actual vitamin C amount easy to compare.

Buffered or mineral ascorbates

These products pair ascorbate with minerals such as sodium or calcium and are often marketed as gentler. Check both the vitamin C amount and the accompanying mineral. “Buffered” is not, by itself, evidence that everyone needs or benefits from the higher price.

Liposomal products

These use lipid-based delivery systems and are commonly promoted for enhanced absorption. Formulations and evidence are not interchangeable. A claim of superior absorption should be tied to evidence for the actual formulation, and improved absorption does not automatically establish a better health outcome.

Slow-release and combination products

Convenience, tablet size and tolerability can matter. For blends, judge every active ingredient and daily amount separately rather than assuming that a longer ingredient list creates a superior product.

Everyday or high-strength vitamin C?

Vitamin C products range from modest daily tablets to 500–1,000 mg high-strength products, powders and effervescent formats. The EU NRV is 80 mg, so these larger doses are clearly positioned as high-strength rather than simply meeting the label reference value.

Higher strength can also change the format

Large vitamin C amounts are easy to formulate as powders, drinks and effervescent tablets as well as conventional tablets or capsules. Compare the daily amount together with serving convenience, added minerals or sweeteners, and whether a specialised delivery system offers something you actually value.

What should you compare?

Start with the daily vitamin C amount

Compare the recommended daily serving, not the amount in one tablet when the serving contains several tablets.

Choose the simplest form that meets your needs

Ascorbic acid is a sensible baseline. Pay more for a specialised form only when its practical or evidence-based advantage matters to you.

Check what “gentle” or “high absorption” actually refers to

Look for evidence connected to the formulation, not only an attractive technology word.

Review added minerals and ingredients

Buffered products and blends can contribute sodium, calcium, zinc or other nutrients that belong in the total daily comparison.

Compare value per daily serving

Prices change, so first make the dose and formulation comparable. Then consider the current cost of the amount you would actually take rather than relying on pack price or premium packaging.

Product comparison

Compare vitamin C supplements

Compare vitamin C per day, vitamin C per unit, serving, vitamin C form, product format, added ingredients and vegan suitability.

A higher dose or premium formulation is not automatically better. Start with the labelled daily amount, then compare the vitamin C form, format and added ingredients. Vitamin C EU Nutrient Reference Value (NRV): 80 mg for adult labelling; it is a labelling reference, not a personal dose recommendation.

Default order: adult products by labelled daily amount from lowest to highest; equal amounts alphabetically. Children's products are shown separately at the end. The order is not a ranking.

Product	Vitamin C / day	Vitamin C / unit	Recommended daily serving	Vitamin C form	Product format	Added ingredients	Vegan
BetterYou Vitamin C Oral SprayView product ↗	120 mgLower age-based doses are stated on the label	24 mg / spray	5 sprays	Ascorbic acid + acerola cherry extract	Oral spray	Acerola cherry extract	Yes
Solgar Ester-C Plus 500 mgView product ↗	500 mg	500 mg	1 vegetable capsule	Calcium L-ascorbate (Ester-C®)	Vegetable capsule	Citrus bioflavonoids, rose hips, acerola and rutin	Yes
Solgar Vitamin C 500 mgView product ↗	500 mg	500 mg	1 vegetable capsule	L-ascorbic acid	Vegetable capsule	—	Yes
Altrient C Liposomal Vitamin CView product ↗	1,000 mg	1,000 mg	1 sachet	Sodium ascorbate in a liposomal formulation	Liquid-gel sachet	500 mg phosphatidylcholine	Yes
Children’s products
Solgar Kangavites Vitamin C 100 mgView product ↗	100–200 mg	100 mg	1–2 tablets	Sodium ascorbate + L-ascorbic acid	Chewable tablet	Acerola and rose hips	Not confirmed

Formulation note: “Buffered” and “liposomal” describe product characteristics; they are not ratings or proof of a better health outcome.

EU health claim details

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Authorised health claims

A quick consumer view — full regulatory list available below

● Vitamin C contributes to maintain the normal function of the immune system during and after intense physical exercise.Immune system · General population

Claim type
Health functions (Article 13)

Condition of use
The claim may be used only for food which provides a daily intake of 200 mg vitamin C in addition to the recommended daily intake of vitamin C.

EFSA / scientific assessment
EFSA opinion reference listed in the EU Register / Regulation (EU) No 432/2012

EU legal source
Commission Regulation (EU) No 432/2012 (consolidated 20 Aug 2025)

Additional statement / restriction
Information shall be given to the consumer that the beneficial effect is obtained with a daily intake of 200 mg in addition to the recommended daily intake of vitamin C.

● Vitamin C contributes to normal collagen formation for the normal function of blood vessels.Blood vessels · General population

Claim type
Health functions (Article 13)

Condition of use
The claim may be used only for food which is at least a source of vitamin c.

What does “source of” usually mean?
General food: 12 mg / 100 g or 100 ml
Beverage: 6 mg / 100 ml
Single-portion pack: 12 mg per portion
Calculated from the EU NRV significant-amount reference. Claim-specific conditions take precedence.