Which Vitamin C is right for you?

What is Vitamin C?

Vitamin C, also known as ascorbic acid, is an essential water-soluble vitamin. The human body cannot produce it itself and is entirely dependent on food. Vitamin C acts as an antioxidant and as a cofactor in collagen synthesis, iron absorption, and immune function.

Most mammals produce their own vitamin C in their liver via the enzyme L-gulonolactone oxidase. Humans, primates, guinea pigs, and a few other exceptions lack this enzyme due to a mutation in evolutionary history. As a result, we are entirely dependent on external supply. A deficiency classically manifests as scurvy — a disease that historically afflicted sailors during long voyages without fresh fruit.

In common foods, bell peppers, broccoli, citrus fruits, kiwi, strawberries, and rose hips are good sources. Tropical sources stand out numerically: Camu Camu from the Amazon contains 30-60 times more vitamin C per gram than an orange, and acerola is similarly rich. Both are used as the basis for "natural" vitamin C supplements.

Vitamin C is sensitive to heat, light, and oxygen — a large part disappears during cooking, storage, or prolonged exposure to air. Therefore, a varied diet with raw vegetables and fruits may be perfectly sufficient for the recommended 80 mg, but many people opt for a guaranteed daily intake via a supplement. Also check out our collagen category — vitamin C is the officially recognized cofactor in collagen formation.

Vitamin C and EFSA — what is scientifically recognized?

Vitamin C has one of the widest ranges of recognized EFSA claims, included in EU Regulation 432/2012. The following formulations may be used literally — provided the threshold is met:

"Vitamin C contributes to the normal functioning of the immune system."

"Vitamin C contributes to the protection of cells from oxidative stress."

"Vitamin C contributes to normal collagen formation for the normal function of skin, bones, cartilage, gums, teeth, and blood vessels."

"Vitamin C contributes to normal energy-yielding metabolism."

"Vitamin C contributes to the normal functioning of the nervous system."

"Vitamin C contributes to normal psychological function."

"Vitamin C increases iron absorption."

"Vitamin C contributes to the reduction of tiredness and fatigue."

"Vitamin C contributes to the regeneration of the reduced form of vitamin E."

"Vitamin C contributes to the normal function of the immune system during and after intense physical exercise."

Threshold: claims apply to a daily intake of at least 15% of the RI — which is 12 mg of vitamin C per serving. For the claim regarding intense physical exercise, a higher threshold of 200 mg/day applies. Our products generally provide well over these thresholds.

Ascorbic acid, buffered or liposomal — what's what?

Ascorbic acid: The pure, acidic form of vitamin C. Inexpensive, widely researched, and effective. Disadvantage: at higher dosages (>500 mg), it can cause stomach complaints due to its low pH.

Buffered (ascorbates): Ascorbic acid bound to a mineral: sodium, calcium, or magnesium ascorbate. Less acidic, more stomach-friendly — popular with those who use higher dosages or have stomach sensitivity.

Liposomal: Vitamin C encapsulated in phospholipid shells (liposomes). Theoretical advantage: better absorption and higher blood levels. Independent research shows mixed results — some studies confirm the claim, others see no difference. For those who want to try it: liposomal is a popular premium choice.

From fruit (camu camu, acerola): Vitamin C in combination with the natural matrix of bioflavonoids, other antioxidants, and plant cofactors. Lower absolute dosage per gram than synthetic ascorbic acid, but preferred by those who opt for the "wholefood" approach.

Plenthera's Vitamin C forms

Ascorbic acid (powder or capsules)

The pure form. High dosage per gram, widely researched, cost-effective. May feel somewhat acidic on an empty stomach for sensitive stomachs — in that case, take with a meal or choose the buffered form.

Buffered Vitamin C

Ascorbic acid bound to sodium, calcium, or magnesium ascorbate. Stomach-friendly, ideal for higher dosages or daily use. The magnesium variant also provides a small contribution to magnesium intake.

Liposomal Vitamin C

Vitamin C in a phospholipid shell. Often chosen by those who want to achieve maximum blood levels without further increasing dosage. Available as a gel or liquid.

Vitamin C from Camu Camu

A fruit from the Amazon with the highest natural vitamin C concentration in the world (2,000-3,000 mg per 100g). Also contains bioflavonoids, polyphenols, and minerals — for those who prefer the wholefood route.

Vitamin C from Acerola

Caribbean cherry with approximately 1,700 mg of vitamin C per 100g. Often standardized to 17-25% vitamin C and combined with bioflavonoids from the fruit itself.

How to use Vitamin C?

Simple basic approach for Vitamin C:

1. Determine your goal: covering the RI (80 mg), broad support (250-500 mg), or higher intake (1000+ mg).
2. For dosages under 500 mg: 1x per day is sufficient.
3. For higher dosages: spread over 2-3 moments — vitamin C is absorbed in limited quantities at one time.
4. For a plant-based diet: combine vitamin C with iron-rich meals for optimal iron absorption.
5. For sensitive stomachs: choose buffered vitamin C or take with a meal.
6. Store the product in a cool, dark place — vitamin C oxidizes with light and heat.

Myths and misunderstandings about Vitamin C

Myth 1: "The more vitamin C, the better the immune system."

Vitamin C is water-soluble — what the body doesn't use, it excretes through urine. Above a certain dosage (~200 mg/day for most), saturation is reached, and additional intake does not provide extra effect. At high dosages (>1000 mg), gastrointestinal complaints are more frequently reported.

Myth 2: "Liposomal vitamin C is many times more effective than regular vitamin C."

Some studies confirm higher blood levels with liposomal formulations, others see no significant difference. The claim "many times more effective" is not supported by consistent research. Liposomal is a legitimate choice — but without a guarantee of a miraculous difference.

Myth 3: "Vitamin C helps prevent colds."

For the prevention of colds in general users, meta-analyses do not show a consistently significant effect. However, regular use seems to slightly reduce the duration and severity of colds in some people, and there is evidence for extra intake during intense physical exercise. EFSA recognizes a claim for immune function during and after intense sport.

Myth 4: "Natural vitamin C from fruit is always better than synthetic."

At a molecular level, ascorbic acid is ascorbic acid — synthetically or naturally identical. What distinguishes fruit sources is the matrix: bioflavonoids, polyphenols, and additional antioxidants. For those who want to include these "accompanying substances," the fruit route is logical — for those who only want to achieve the absolute vitamin C intake, ascorbic acid does so more efficiently and cheaper.

Combining Vitamin C with other supplements

Vitamin C works synergistically with various other nutrients. Commonly chosen combinations:

• Collagen: vitamin C is officially recognized as a cofactor in collagen formation. For those supplementing with collagen, a combination with vitamin C is logical.
• Iron (plant-based): vitamin C significantly increases the absorption of non-heme iron. Especially relevant for vegetarians and vegans.
• Vitamin E: vitamin C regenerates the reduced form of vitamin E (EFSA claim) — both work together as an antioxidant tandem.
• Bioflavonoids (quercetin, hesperidin): are often combined with vitamin C for a broader antioxidant profile.
• Zinc: common combination for immune support — both play a role in immune function and are often combined in winter formulas.

Frequently Asked Questions

What is Vitamin C?

Vitamin C (ascorbic acid) is an essential water-soluble vitamin. The body cannot produce it itself. Vitamin C acts as an antioxidant and as a cofactor in collagen synthesis, iron absorption, and immune function.

How much Vitamin C per day?

The European RI is 80 mg per day. For broad support, many choose 250-1000 mg. Above 1000 mg/day, gastrointestinal complaints are more frequently reported.

What is liposomal Vitamin C?

Vitamin C in a phospholipid shell — advertised for higher absorption. Independent research shows mixed results.

Does liposomal Vitamin C work better?

Some studies show higher blood levels, others do not. There is no consistent evidence for a dramatic difference. Liposomal is a legitimate premium choice, but not a miracle form.

What is the difference between ascorbic acid and buffered Vitamin C?

Ascorbic acid is the pure, acidic form. Buffered vitamin C is bound to a mineral (sodium, calcium, or magnesium) — less acidic and more stomach-friendly.

Vitamin C for colds — does it work?

Meta-analyses do not show a consistent preventive effect in general users. However, there are indications of a slight effect on duration and severity, and for intense physical exercise, EFSA recognizes a specific claim.

What is camu camu?

A fruit from the Amazon with the highest natural vitamin C concentration in the world (2,000-3,000 mg per 100g). Used as a basis for natural vitamin C supplements.

When to take Vitamin C?

Water-soluble, so timing is flexible. Spread higher dosages over 2-3 moments. For sensitive stomachs: with a meal.

Vitamin C and iron together — is it necessary?

Vitamin C significantly increases the absorption of non-heme iron. Especially for vegetarians/vegans, simultaneous intake is logical.

Can you take too much Vitamin C?

EFSA has not set a specific upper limit. Above 1000 mg/day, gastrointestinal complaints (diarrhea, cramps) are more frequently reported. Above 2000 mg, caution is advised, especially with kidney problems.

Sources

• EFSA Regulation (EU) 432/2012 — vitamin C claims.
• EFSA NDA Panel — Scientific Opinion on Dietary Reference Values for vitamin C (2013).
• Hemilä H. & Chalker E., "Vitamin C for preventing and treating the common cold", Cochrane Database Syst Rev (2013).
• Davis JL. et al., "Liposomal-encapsulated Ascorbic Acid: Influence on Vitamin C Bioavailability", Nutr Metab Insights (2016).
• USDA FoodData Central — vitamin C content food database.