Ester-C® is a gentle, highly absorbable form of Vitamin C with long-lasting effects. Thanks to its combination with L-Threonate, it stays active in your immune cells for up to 24 hours—while being extra kind to your stomach.

How much Ester-C® should you take?

The ideal amount depends on your personal needs—often, 500 mg of Vitamin C per day (for example, 1 capsule of BIOGENA Ester-C® Gold) is a solid starting point.If your needs increase, you can adjust the dosage accordingly—just be sure to consult a trusted health professional for guidance.

Is Ester-C® better than regular vitamin C?

Ester-C® offers your body more than standard Vitamin C forms: it’s gentle on the stomach, easier to tolerate, and thanks to L-Threonate, it stays active in your immune cells longer—delivering a smart, all-around Vitamin C supply with 24-hour support.

How is Ester-C® made?

Ester-C® is produced through a unique, patented process that transforms regular ascorbic acid into a buffered Vitamin C compound containing calcium L-ascorbate and the natural Vitamin C metabolite L-Threonate—resulting in a highly tolerable and long-lasting form of Vitamin C.

Is Ester-C® the same as vitamin C?

Ester-C® is vitamin C—but in a gentler, better-tolerated form. Unlike regular ascorbic acid, Ester-C® also contains calcium and L-Threonate, which enhance absorption and provide a full 24-hour effect within your immune cells.

What does the term “pure substance principle” mean?

At BIOGENA, “pure substance principle” means that we do not use technological additives which are used for the fully automated manufacturing of tablets, capsules and pills (e.g. anticaking or release agents and so forth) or additives that are used for optical reasons or for enhancing the taste of the products (artificial aroma, colouring agents, coatings etc.). Due to a semi-automatic manufacturing process, we can avoid these substances that often have a higher proportion in customary products than the actual active ingredients. In the case of nutritional supplements, additives have to be indicated in the list of ingredients. Here, the patient or customer can get useful information. Concerning the single ingredients, we also care for our raw materials to be free of carrier substances. In cases where this is not possible, we use natural food components such as maltodextrin, cellulose powder or calcium carbonate. The majority of our ingredients is produced exclusively for us – free of carrier substances (e.g. our enzymes our probiotics: other manufacturers often use lactose as a carrier – the product batches produced for us are explicitly without carriers).

Where can I buy BIOGENA preparations?

BIOGENA cooperates with respected physicians and therapists in many different countries. With them, you are in good hands. You can also buy our products from our BIOGENA stores in Austria (Vienna, Linz, Salzburg, Graz, Natternbach), Germany (Freilassing, Frankfurt, Düsseldorf, Munich, Hamburg) and soon in London (UK) as well as online at www.biogena.com.

Where are BIOGENA preparations manufactured?

BIOGENA preparations are carefully manufactured in our own production facility, BIOGENA Good Health World (Salzburg, Austria), to a unique manufacturing standard. We are certified according to FSSC and GMP - Good Manufacturing Practice and have organic, halal and kosher certification. The quality-tested raw materials come from premium brand raw material manufacturers - sourced directly from the world market leaders.

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Biogena, Ester-C®, Bottle, white, Vitamin C from original Ester-C® with Quercefit® quercetin phospholipid and hesperidin from citrus extract

Butelka Ester-C® Biogena na kamiennej powierzchni, z tekstem o witaminie C dla funkcji odporności, ochrony przed stresem oksydacyjnym, tworzenia kolagenu i zmniejszenia zmęczenia.

Osoba trzyma kapsułkę Biogena Ester-C, tekst opisuje codzienne wsparcie układu odpornościowego, działanie antyoksydacyjne i produkcję kolagenu dzięki witaminie C.

Butelka witaminy C Ester-C® z składnikami takimi jak Quercefit® kwercetyna, OPC z ekstraktu nasion winogron i bioflawonoidy cytrusowe, opakowania na 3 i 6 miesięcy.

Grafika przedstawiająca różnicę BIOGENA z cechami jakości, takimi jak badane partie, produkcja w Austrii, transparentna deklaracja składników, zespół naukowy i opakowanie nadające się do recyklingu.

Grafika o czystości BIOGENA z informacjami o 20 latach doświadczenia, pracy ręcznej i technologii high-tech, wysokiej biodostępności oraz produkcji w Austrii.

Butelka GreenPE z trzciny cukrowej, w 100% nadająca się do recyklingu, bez plastyfikatorów, pokazująca oszczędność CO₂ i surowce roślinne.

Biogena Exceptionals

Ester-C® Gold

Premium vitamin C, gentle on your stomach, designed to support your immune system

Support your defenses* with a powerful 500 mg of premium Vitamin C per capsule
Perfect for anyone seeking a gentle, acid-free Vitamin C experience
Featuring Ester-C® & L-Threonate for steady, long-lasting Vitamin C supply
Enriched with plant power from Quercefit® quercetin, grape seed, and citrus extracts
More than immune support—Vitamin C also aids normal collagen formation for skin, gums & blood vessels*
Protect your cells and energy levels—Vitamin C helps shield cells from oxidative stress and enhances iron absorption

€44.90

€0.50 / caps.

Stock availableDelivery within 3-5 working days

incl. VAT.

This product goes with these categories

Vitamines Vitamin C Antioxidants Botanicals Immune system supplements Eye and vision supplements Travel and vacation supplements Bestsellers

Convenient capsule form

For daily supplementation

Gluten-free

Lactose-free

Vegan

Support during increased needs

Eine Frau mit schöner Haut und langen, glänzenden roten Haaren, teilweise verdeckt von Farnblättern, Sonnenlicht wirft Schatten auf ihr Gesicht und schafft eine natürliche und ruhige Atmosphäre.

Ester-C® capsules: where quality meets performance

Not all Vitamin C is created equal. What truly matters is the form your body receives.

That’s why our premium formula relies on Ester-C® — a patented, highly tolerable Vitamin C compound that brings extra benefits:

Gentle on the stomach and non-acidic
Superior absorption compared to regular ascorbic acid
Extended retention in immune cells for a full 24-hour supply

The blend is perfectly rounded off with premium Quercetin (Quercefit®) and grape seed extract from certified organic cultivation—natural plant-powered highlights.

Perfect for sensitive individuals and anyone who refuses to compromise on their vitamin C intake.

Ester-C® Gold in detail

What our customers say

Moderne Kunstgalerie mit zeitgenössischen Sitzgelegenheiten, abstrakten Porträts an den Wänden, warmer Beleuchtung und einer Mischung aus Holz- und Metallelementen in der Dekoration.

100% Clean Label – no hidden extras

At BIOGENA, transparency isn’t just a promise – it’s our everyday practice. We follow the pure substance principle: 100% quality, mostly free from colorants, preservatives, and technical additives. The result? Outstanding tolerability (97%) and a recommendation rate of 95% – confirmed by over 18,000 doctors, therapists, and more than half a million customers.

EVERY batch: independently tested
Active ingredient content – guaranteed
100% free from artificial colors/flavors, titanium dioxide, GMOs, nanoparticles, magnesium stearate
In-house production in Salzburg (BIOGENA Good Health World)
Premium raw materials sourced directly from global market leaders

Learn more

Person, die an einem reflektierenden Strand mit klarem Himmel und fernen Bergen läuft und Fußabdrücke im nassen Sand hinterlässt.

What sets us apart

For us, knowledge is more than just information – it’s inspiration. We aim to make health tangible, share what we know, and pass on our passion for it. At the same time, we act with responsibility for our environment – with conviction and heart.

Independent family business, led by founder Dr. Albert Schmidbauer
100% Austrian science in every product
Handcrafted production – uncompromising since 2006
Eco-friendly packaging in the BIOGENA GreenPE bottle
Research & development at the highest level – with the largest scientific team in the industry
Double Climate Positive

Learn more about the BIOGENA story

Ein Arbeiter in Schutzausrüstung gießt eine Substanz in einen großen Industriekessel in einer hellen, modernen Einrichtung.

Production of our premium supplements

At BIOGENA, quality knows no compromises. From raw material sourcing to research and development, all the way to our in-house manufacturing at BIOGENA Good Health World in Koppl near Salzburg – every step is transparent and traceable.

Brand-name raw materials with certified quality seals
EVERY batch independently tested by the German LEFO Institute
Certified according to FSSC 22000

Quality and research

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FAQs

Got questions about Ester C® Vitamin C? We’re here to help.

Laboratory analyses & further product information

Laboratory analysis Heavy metals

LEFO-Certificate Ester-C - p-51726

PDF

Laboratory analysis Heavy metals,Microbiology

LEFO-Certificate Ester-C - p-50852

PDF

Laboratory analysis galactose,lactose,Rutin

LEFO-Certificate Ester-C Gold - p-48745

PDF

Laboratory analysis Hesperidin

LEFO-Certificate Ester-C Gold - p-57321

PDF

Laboratory analysis Microbiology

LEFO-Certificate Ester-C Gold - p-54977

PDF

Laboratory analysis quercetin

LEFO-Certificate Ester-C Gold - p-55741

PDF

Laboratory analysis Heavy metals,Vitamin C

LEFO-Certificate Ester-C Gold - p-55745

PDF

Laboratory analysis Gluten

LEFO-Certificate Ester-C Gold - p-50782

PDF

Laboratory analysis quercetin

LEFO-Certificate Ester-C Gold - p-55121

PDF

Laboratory analysis Heavy metals

LEFO-Certificate Ester-C Gold - p-57612

PDF

Laboratory analysis Vitamin C,quercetin

LEFO-Certificate Ester-C Gold - p-57289

PDF

Laboratory analysis quercetin,Vitamin C

LEFO-Certificate Ester-C Gold - p-59196

PDF

Laboratory analysis Microbiology,lactose,galactose

LEFO-Certificate Ester-C Gold - p-59291

PDF

Laboratory analysis preservatives

LEFO-Certificate Ester-C Gold - p-60350

PDF

Laboratory analysis Microbiology

LEFO-Certificate Ester-C Gold - p-59218

PDF

Uncompromising quality

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