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Shaanxi Kaishi Biotechnology Co., Ltd
Product Description
Grape Seed Extract Capsules are botanical nutraceutical products made from Vitis vinifera seeds and standardized for proanthocyanidins, including oligomeric proanthocyanidins. They are widely used in antioxidant, cardiovascular wellness, healthy-aging, and beauty-from-within formulations where buyers require defined polyphenol content, reliable analytical control, consistent capsule loading, and appropriate standardization-method documentation.
Grape seed extract is produced from the seeds of Vitis vinifera L. and contains a complex mixture of polyphenols, particularly proanthocyanidins composed of catechin- and epicatechin-related units. Commercial grades are often promoted by their proanthocyanidin or OPC percentage, but these headline values are meaningful only when the analytical method and specification basis are also understood.
For B2B sourcing, grape seed extract is not equivalent to grape juice powder, grape skin extract, or a generic grape polyphenol ingredient. The seed is the defining raw material, while the principal commercial fingerprint is how proanthocyanidins are standardized and measured.
| Item | Specification |
|---|---|
| Product Name | Grape Seed Extract Capsules |
| Botanical Name | Vitis vinifera L. |
| Plant Part | Seed |
| Product Category | Standardized Plant Extract / Polyphenol Nutritional Supplement Capsules |
| Primary Marker Group | Proanthocyanidins, including oligomeric proanthocyanidins |
| Extract CAS Reference | 85594-37-2 is used for grape seed extract in some commercial and regulatory databases; botanical extracts remain compositionally complex materials |
| Molecular Formula | Not applicable as a single formula because grape seed extract is a mixture of polyphenolic compounds |
| Molecular Weight | Not applicable as a single molecular weight because the proanthocyanidin fraction contains oligomers of different sizes |
| Typical Appearance | Reddish-brown to brown fine powder |
| Common Commercial Grades | Typically standardized to approximately 75% to 95% proanthocyanidins or OPC-related specifications depending on analytical method and product positioning |
| Common Extract Ratio | Concentrated botanical extract ratios vary according to extraction and standardization process; standardized marker content should take priority over extract ratio alone |
| Test Method | Validated chromatographic or colorimetric methods according to the stated proanthocyanidin specification; HPLC is commonly used for identity and polyphenol profiling |
| Identity | Botanical identity plus chromatographic fingerprint or validated analytical identification |
| Capsule Shell | Hard gelatin or vegetarian HPMC capsule options |
| Capsule Fill | Customized according to extract potency, target active level, capsule size, and formulation requirements |
| Particle Size | Controlled or customized according to blending, flow, and capsule filling requirements |
| Quality Testing | Identity, proanthocyanidin assay, heavy metals, microbiological parameters, residual solvents, moisture, and applicable contaminant controls |
| Shelf Life | Typically 24 months under recommended storage conditions |
| Storage | Store tightly sealed in a cool, dry place protected from direct sunlight, heat, and moisture |
| Bulk Ingredient Packaging | 1 kg and 5 kg aluminum foil bags; 25 kg fiber drums for applicable bulk orders; customized packaging supported |
| Finished Capsule Packaging | Bottles, jars, and customized private-label packaging formats |
| Order Quantity | Bulk and OEM production supported; order requirements vary according to standardization, capsule configuration, formula, and packaging format |
The most important sourcing issue for grape seed extract is not simply choosing the highest advertised OPC percentage. Proanthocyanidins are a family of oligomeric and polymeric flavan-3-ols rather than one single molecule, and different analytical methods can produce different numerical results for the same material.
For this reason, a specification stated as 95% OPC should not automatically be considered superior to a 75% oligomeric proanthocyanidin specification tested under a different validated method. Procurement teams should compare the assay method, reference standard, oligomer definition, and chromatographic profile before comparing percentage claims.
| Specification Style | What It Indicates | Buyer Check |
|---|---|---|
| Total Proanthocyanidins | Broad measurement of proanthocyanidin compounds | Confirm the analytical method and calibration standard |
| OPC Specification | Commercial measure emphasizing oligomeric proanthocyanidins | Do not compare percentages across suppliers without checking the method |
| Defined Oligomeric Proanthocyanidins | More specifically characterizes the oligomeric fraction | Review whether monomers and larger polymers are excluded or separately quantified |
| HPLC Polyphenol Profile | Provides information about individual markers and overall fingerprint | Use alongside the headline assay for stronger raw-material qualification |
OPC is widely used as a commercial term, but the numerical percentage can depend heavily on the test method. Some colorimetric procedures respond differently to monomers, oligomers, and larger polymers, while chromatographic methods provide a different view of the extract. A serious sourcing comparison should therefore evaluate method equivalence before comparing price per kilogram.
Grape-derived ingredients are not interchangeable. Grape seed extract is particularly associated with proanthocyanidins, while grape skin ingredients may emphasize anthocyanins or resveratrol-related positioning, and grape juice powders are generally developed around fruit solids and flavor rather than concentrated seed proanthocyanidins.
| Grape Ingredient | Primary Commercial Focus | Typical Product Positioning |
|---|---|---|
| Grape Seed Extract | Proanthocyanidins and oligomeric polyphenols | Antioxidant and polyphenol supplements |
| Grape Skin Extract | Anthocyanins and skin-derived polyphenols | Colorful polyphenol and antioxidant formulations |
| Grape Juice Powder | Fruit solids, flavor, and general grape phytonutrients | Food, beverage, and fruit-based nutrition products |
Grape Seed Extract Capsules are commonly developed for antioxidant, cardiovascular wellness, circulation-support, healthy-aging, and beauty-from-within supplement concepts. Grape seed proanthocyanidins have been studied for antioxidant and vascular-related biological properties. Finished-product wording should remain consistent with applicable food and dietary supplement regulations in the intended sales market.
A higher assay can reduce the amount of extract needed to achieve a target proanthocyanidin contribution, which may leave more capsule space for complementary ingredients. However, the practical value of a high percentage depends on analytical reliability, bulk density, powder flow, extract composition, and the actual label strategy.
For a single-ingredient grape seed capsule, formulators may prioritize a high standardized proanthocyanidin level and simple excipient system. For combination products, capsule space, color, flavor, hygroscopicity, and compatibility with other polyphenols should be considered together with the headline assay.
Grape Seed Extract Capsules can be customized according to proanthocyanidin specification, capsule shell, serving configuration, complementary ingredients, and packaging requirements. OEM programs can range from concentrated single-ingredient capsules to broader antioxidant and healthy-aging formulas.
Quality control for grape seed extract should verify both botanical identity and the stated proanthocyanidin specification. Because method differences can influence assay results, procurement documentation should identify the analytical procedure instead of presenting the percentage without context. GMP-standard production conditions and batch testing support consistent Capsule Manufacturing.
A strong grape seed extract specification does more than state an OPC percentage. It identifies the botanical source, plant part, analytical method, marker definition, and relevant contaminant controls. This allows purchasing teams to compare materials on a technically meaningful basis and reduces the risk of selecting a product solely because its headline percentage appears higher.
In-house R&D and testing support, GMP-standard production conditions, customized formulations, private-label packaging, third-party testing options, and stable bulk supply can support projects from raw-material selection through finished capsule production.
Bulk grape seed extract is commonly supplied in sealed aluminum foil bags and suitable fiber drums, depending on quantity and product specification. Finished capsules can be packed in bottles, jars, and customized private-label formats. Products should remain tightly sealed and protected from excessive heat, moisture, and direct sunlight during storage.
No. Grape seed extract is produced specifically from Vitis vinifera seeds and is commonly standardized for proanthocyanidins. Grape juice-derived ingredients primarily originate from fruit juice solids and have a different chemical profile. Buyers seeking OPC-rich material should therefore verify the plant part rather than relying only on the word grape.
Not necessarily. The percentages may have been generated using different analytical methods and therefore may not be directly comparable. Buyers should examine the assay procedure, reference standard, definition of oligomers, chromatographic profile, and batch consistency before deciding which grade provides the stronger technical and commercial specification.
A useful COA should confirm botanical identity, plant part, proanthocyanidin assay, analytical method, moisture, residual solvents where applicable, heavy metals, and microbiological parameters. For higher-value Standardized Extracts, a chromatographic fingerprint or additional polyphenol information can provide stronger evidence of composition and batch consistency.
The appropriate grade depends on the target active content, capsule capacity, product positioning, and analytical standard. High-standardization grades can provide greater active density, while broader extracts may suit botanical positioning. Formulators should compare actual marker content and method-defined specifications rather than selecting an extract based solely on nominal percentage.
Grape Seed Extract Capsules provide a concentrated Vitis vinifera polyphenol format for antioxidant, cardiovascular wellness, healthy-aging, and beauty-focused nutraceutical products. For B2B sourcing, the critical decision is not simply OPC percentage but whether the proanthocyanidin assay method, botanical identity, marker definition, and capsule specification are technically aligned.
Contact us today to request samples, a COA, technical documents, and a wholesale quotation for Grape Seed Extract Capsules.
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