OPC 300
Grape Seed Extract


Our ultra pure and high-dose OPC 300 contains a full 300mg of OPC per capsule, derived from French Chardonnay grape seeds. OPC content guaranteed by HPLC testing at TU Braunschweig. Ultra pure extraction process using only water and edible ethanol. Vegan, no additives. 240 capsules
  • Natural source: 100% Chardonnay grape seeds from France.
  • Highly dosed: a full 300mg of pure OPC content per capsule
  • Premium grape seed extract with 95% total polyphenol content
  • OPC content confirmed by HPLC laboratory test (University of Braunschweig)
  • Contains bioactive OPC di- to pentamers
  • High purity extraction process: gentle extract only from water & edible ethanol
  • No use of solvents like methanol, ethyl acetate, acetone or N-hexane
  • HPLC laboratory test: OPC content confirmed by Braunschweig University
  • vegan, gluten-free, without genetic engineering
Customize <span class="protect-case">OPC</span> 300 <br/>Grape Seed Extract
2 x OPC 300 Grape Seed Extract   + €0.00

* Required Fields

€37.81 €39.80

2x240 capsules

Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€152.09 / 1kg

Premium Bioactive Ingredients

  • 100% premium grape seed extract 
  • High-dose OPC: 300mg pure OPC per capsule (di- to polymers)
  • OPC content confirmed via reliable HPLC testing method by the TU Braunschweig
  • Di- to pentamer content: 11.7%
  • Di- to tetramer content: 9.96%
  • Only from white Chardonnay grapes from France as natural premium OPC source
  • Guaranteed minimum content of 95% polyphenols
  • Ultra pure extraction process using water and edible ethanol, free from chemical residues such as methanol, ethyl acetate, acetone, and n-hexane
  • Vegan, non-GMO, gluten-free, soy-free

How are we different?

Our OPC 300 capsules are 100% extracted from the seeds of French Chardonnay grapes, which are considered the best source of natural OPC.

The quality of different OPC products differs enormously, as the actual content of OPC varies greatly. Conventional tests such as the DMAC and vanillin tests provide misleading and far too high OPC values here, which are sometimes 400% higher than the actual OPC content. Only HPLC controls can confirm the true OPC content.

Our OPC 300 has been tested by the TU Braunschweig for its actual OPC content and the test results are published by us in their entirety. Our grape seed extract from French Chradonnay grapes has a pure content of at least 95% polyphenols. Many manufacturers confuse this with the actual OPC content. According to the manufacturer of our raw materials, this content is 77.6%. We were able to confirm this value with an HPLC laboratory test broken down into mono-, di-, tri-, tetra-, penta- and polymers, the most reliable measuring method, carried out by the Technical University of Braunschweig: minus the monomers not counted as OPCs, the OPC pure content was around 77.5%. For the di- to pentamers, which are relevant according to the strict interpretation, the content was 11.7%.

In contrast to other products, our OPC 300 is extracted completely without solvents, using only water and edible ethanol. This allows us to achieve a highly pure OPC concentrate that has never been in contact with common chemical solvents such as N-hexane. All products are guaranteed free of additives such as maltodextrin or peanut powder, which are added by many manufacturers for cost reasons but do not have to be declared.

As capsule shells we use special HPMC capsules, which, unlike most other HPMC or Pullulan capsules on the market, are manufactured 100% without the auxiliary substances carrageenan and PEG, which do not have to be declared. For packaging, we use light-protected and environmentally friendly amber glass instead of plastic.


  • Premium active ingredients in their purest form
  • Sourced directly from the world’s best producers
  • Our select raw materials are the basis of all our formulations
  • Complete avoidance of all unnecessary additives and adjuvants
  • Exclusive use of valuable natural ingredients for additives
  • We voluntarily declare all ingredients
  • All extractions performed without the use of chemical solvents
  • Custom production when necessary, in order to achieve the highest possible level of purity
  • Independent laboratory testing available on product pages
  • Raw materials sourced only from premium suppliers who are committed to fair working conditions
  • Amber glass and compostable pouches used for packaging
  • Vegan capsule shells, free from PEG and carrageenans
  • Packaged in the EU according to HACCP, GMP and ISO 22000:2018 standards
  • Stored in non-toxic containers
  • Shipped in mineral oil-free boxes
  • All products guaranteed 100% free from magnesium stearate, silicon dioxide, nanoparticles (no legal opportunism), genetic engineering, artificial colours and flavours, titanium dioxide and added sugar & sweeteners


OPC Grape Seed Extract

OPCs (Oligomeric Proanthocyanidins) are a group of substances belonging to the flavonols, which consist of polymers of catechins and epicatechins. Proanthocyanidins are the most powerful antioxidants in nature and are several times more powerful than other nutritional antioxidants such as vitamins C and E.

The various proanthocynidins are categorised by their number of units (e.g. monomer for one unit, dimer for two). The exact definition of OPC is unclear and may include only di- to tetramers, di- to pentamers, di- to hexamers, or even all proanthocyanidins except monomers.

For a long time, the only oligomeric proanthocyanidins that were considered to be bioactive were di- to pentamers, i.e. oligomers consisting of 2-5 subunits, due to their ability to be taken up by the blood. However, new studies show that polymeric proanthocyanidins (those comprising 7 or more units) are partially broken down during digestion and have a highly beneficial effect on intestinal flora and the immune system. Consequently, OPC should be considered an active complex in which all components contribute towards its overall effect.

HPLC-guaranteed Pure OPC Content

In addition to ensuring the greatest possible purity of our products, we strive to have the highest possible OPC content for our raw materials in order to ensure a sufficient dose of active ingredients. Our grape seed extract derived from Spanish white grapes has a total polyphenol content corresponding to at least 95%. The total polyphenol content is, however, not to be confused with the actual OPC content of a product. Information regarding the OPC content of our product was ascertained via an HPLC laboratory test (the most reliable measuring method) on mono-, di-, tri-, tetra-, penta-, and polymers,that was conducted by the Technical University of Braunschweig. Excluding the monomers which do not belong to the OPCs, the pure OPC content is estimated at 77.5%. According to a stricter definition including only di- to pentamers, this percentage is 12.7%.

Optimised Extraction Process Without Chemical Additives

OPC extracts can be produced using controversial solvents such as n-hexane, acetone, and methanol. However, we utilise the purest possible extraction methods, using only water and edible ethanol, thereby avoiding the potential for harmful chemical residues.

High Quality Standards

This product was produced according to the highest quality and purity standards in an HAACP-certified facility in the EU. Our in-house production site in the EU allows us to completely avoid the use of chemical additives such as magnesium stearate. This product is gluten-, fructose-, and lactose-free, non-GMO, and vegan, and is produced without additives.


Recommended Dose

Take 1 capsule (300mg OPC) with 200ml water daily.

Food Supplement

Do not exceed the recommended dose. Nutritional supplements cannot replace a balanced and varied diet. Keep out of reach of children.


Store in a cool, dry place away from direct sunlight and heat.



Ingredients: Grape Seed Extract (from French Chardonnay Grapes).
Capsule shells: Hydroxypropyl Methylcellulose.
Contains: 240 capsules

Ingredients per Daily Dose (1 Capsule) % NRV*
Grape seed extract 400mg -
of which pure OPC (without monomers) 300mg -
of which di- to pentamers 50mg -

* Nutrient Reference Value

Per capsule: 300mg OPC
In total: 72,000mg OPC / jar


Product Details

German Pharmaceutical Number (PZN): 16151422
Origin:  French Chardonnay grape seed extract; water/edible ethanol extraction process

In-house production in Europe, bottling and encapsulation in the EU according to HACCP, GMP / ISO 22000:2018 standards
Finished products packaged in amber glass jars, and stored in non-toxic containers
Shipping in mineral oil-free boxes

Capsules:  Plant-based cellulose (HPMC). Vegan
Premium HPMC quality: Free from controversial additives such as carrageenans and PEG
Packaging:  Amber glass jar to protect against light and oxidation (free from plasticisers and BPA)
To Reuse:  Remove product label by soaking the jar in warm water for 5 minutes. Glue residue can be removed with dish soap.

Laboratory Tests

The purity of our formulas is important to us. This is why we have both our raw ingredients as well as our finished products extensively tested by independent laboratories to confirm purity and active ingredient content. Here, we have provided the results of some of the tests carried out on this product.

Sunday Natural

Our Philosophy

For thousands of years, cultures all over the world have been using medicinal plants and nutritious foods to naturally foster and maintain vitality and good health.

With our products, we try to emulate this ancient wisdom as much as possible.

Consequently, our philosophy is simple: everything we do meets the highest standards of quality and purity; our focus is on organic and natural ingredients.

We follow this philosophy with meticulous care on all levels and down to every last detail.

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