Evidence and label comparisons · WSNC nutrition education

Grape Seed Extract Supplements: Procyanidins and Proprietary Blend Differences

Vitanox separately declares grape seed extract and procyanidins, while OPC Synergy includes grape ingredients inside a proprietary blend. Compare those different levels of label detail without assuming an OPC product name gives a specific grape-seed amount.

Compare the exact preparation and labeled serving

Vitanox lists 50 mg grape seed extract containing 42.5 mg procyanidins per tablet alongside other herbs. OPC Synergy's total proprietary blend includes several ingredients and declares sulfites; the full blend is not grape seed alone.

The amounts below reproduce the inspected manufacturer online panel. They describe labeled servings, not an individualized regimen. Confirm your selected package and review the full ingredient list and dietary attributes on the product page.

Declared manufacturer amounts checked October 14, 2026; compare the exact selected package
Product	Declared serving facts	Important distinction
OPC Synergy®View product →	Declared serving factsEach Serving Size (1 Capsule) contains: Proprietary Blend 410 mg: Organic buckwheat (aerial parts) juice powder, organic buckwheat (aerial parts), green tea (leaf) powder, organic carrot, grape seed extract, bilberry (fruit) extract, green tea (leaf) extract, and grape extract.	Important distinctionRead the complete OPC Synergy® ingredient list and current package. The serving facts describe this formula; a shared ingredient does not make it equivalent to another product.
Vitanox®View product →	Declared serving factsEach Serving Size (1 Tablet) contains: Calcium 38 mg, Rosemary leaf 7.5:1 extract 133.4 mg (from Rosmarinus officinalis leaf 1.0 g), Green Tea leaf 25:1 extract 166.7 mg (from Camellia sinensis leaf 4.2 g, Containing catechins 83.35 mg), Turmeric rhizome 25:1 extract 80 mg (from Curcuma longa rhizome 2.0 g, Containing curcuminoids 70.4 mg), Grape seed 120:1 extract 50 mg (from Vitis vinifera seed 6.0 g, Containing procyanidins 42.5 mg).	Important distinctionRead the complete Vitanox® ingredient list and current package. The serving facts describe this formula; a shared ingredient does not make it equivalent to another product.

References: WSNC OPC Synergy® recorded label details ↗ · WSNC Vitanox® recorded label details ↗ · Grape Seed Extract: Usefulness and Safety | NCCIH ↗

What the ingredient evidence can establish

NCCIH describes possible effects on certain lipid and blood-pressure measures, but small studies and varying preparations limit conclusions. Those measures do not prove prevention of cardiovascular events.

Seed extract, grape extract and whole grape ingredients are different. A standardized marker does not establish an identical effect across formulas or disclose the amount of another ingredient in a blend.

References: Grape Seed Extract: Usefulness and Safety | NCCIH ↗

Review suitability, medicines and the whole formula

Review medicine use and pregnancy or nursing with your practitioner. Sulfite sensitivity and gelatin are relevant to OPC Synergy's package review. Do not replace cardiovascular treatment based on antioxidant marketing.

Compare the precise grape preparation, constituent declaration and companion ingredients. Keep the evidence outcome distinct from a general circulation-support category.

References: WSNC OPC Synergy® recorded label details ↗ · WSNC Vitanox® recorded label details ↗ · Grape Seed Extract: Usefulness and Safety | NCCIH ↗

Prepare a focused practitioner conversation

Bring the selected label, your reason for considering grape seed extract, and a list of medicines and other supplements. Compare the intended outcome with the specific preparation studied, and agree how suitability and any benefit will be assessed.

Manufacturer suggested-use text checked for these products: OPC Synergy®: One capsule per day, or as directed. Warning: Keep out of reach of children. Vitanox®: 1 tablet 1 - 2 times daily, or as directed.

These are separate product instructions, not one combined supplement schedule. Keep the current package directions with your practitioner plan; ingredient research does not override manufacturer labeling.

References: WSNC OPC Synergy® recorded label details ↗ · WSNC Vitanox® recorded label details ↗ · Grape Seed Extract: Usefulness and Safety | NCCIH ↗

Protocol label reading

These kits contain a product compared in this guide. That ingredient match does not establish effects for the complete kit or individual suitability. Review all components with your practitioner.

Common questions

How should I compare grape seed extract supplement labels?

Does ingredient research prove the complete formula works?

What should I discuss before considering grape seed extract?

Evidence and product label sources

WSNC label links below present recorded Standard Process product information on our site. Noncommercial references explain ingredients, evidence limits and safety; they do not verify every formula amount or establish a treatment outcome for a finished product or protocol. The referenced organizations do not endorse this store.

Manufacturer nutrition-panel amounts shown here were checked October 14, 2026. Confirm the current packaging, directions and dietary information before use. Your healthcare practitioner can help assess individual suitability.

How we research products → · Prepare a practitioner conversation →