OPC-3 (Oligomeric Proanthocyanidins) is a other combinations supplement by Isotonix in powder form, listing 19 ingredients in the NIH Dietary Supplement Label Database (DSLD), maintained by the Office of Dietary Supplements at the National Institutes of Health. Currently listed as on-market. Daily Value percentages shown below are based on FDA reference daily intake amounts for adults.
How does OPC-3 (Oligomeric Proanthocyanidins) compare?
Ingredients listed on each label, against the other combinations category average of 21.8. Data from the NIH DSLD.
OPC-3 (Oligomeric Proanthocyanidins)19
1,000 mg Vitamin C Acai Berry34
Other Combinations average21.8
OPC-3 (Oligomeric Proanthocyanidins) lists 15 ingredients fewer than 1,000 mg Vitamin C Acai Berry. That is 3 below the other combinations average.
What the Label Data Shows
According to NIH DSLD label rows, OPC-3 (Oligomeric Proanthocyanidins) sits in the top 17% of products with a countable formula by declared ingredient count.
With 19 ingredients on the label, OPC-3 (Oligomeric Proanthocyanidins) is one of the more extensive other combinations supplement formulas from Isotonix in the NIH Dietary Supplement Label Database (DSLD), sold in powder form. These ingredients span 8 nutrient categories, sugar, other, mineral, botanical, and 4 more, reflecting a multi-component formula rather than a single-nutrient product.
Across a broader 19-ingredient formula, 19 of 19 lack a percentage Daily Value in the available source record, leaving their regulatory reference status unspecified on this page.
Availability status shapes how this label record is best used. This product is currently listed as on-market in the DSLD, with its label first entered into the database on 2024-06-20. An on-market listing means the product is currently sold in the United States; the DSLD catalogs the label as submitted but does not independently verify the claims or evaluate safety or efficacy.
About the DSLD database
The DSLD is a label database, not an FDA approval list, under the 1994 DSHEA framework, dietary supplements do not require pre-market approval, and label information reflects what manufacturers self-declare rather than independent laboratory verification. This page presents factual label data for reference only and is not medical advice; consult a licensed healthcare provider before making decisions about any supplement.
Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD) Supplement label data for OPC-3 (Oligomeric Proanthocyanidins): ingredients, % Daily Value, market status, brand · 2026 DSLD captures manufacturer-self-declared label information; the NIH does not verify accuracy or evaluate safety/efficacy. Dietary supplements are regulated under DSHEA 1994, no pre-market FDA approval is required.
Ingredient Breakdown by Category
sugar
5
Total Carbohydrates, Total Sugar, added Sugars, +2 more
other
3
Calories, Red Wine extract, Food Starch, Modified
mineral
3
Potassium, Silica, Calcium Sulfate
botanical
3
Grape seed extract, Pycnogenol, Bilberry extract
non-nutrient/non-botanical
2
Citrus Bioflavonoids Complex, Citric Acid
complex carbohydrate
1
Maltodextrin
fiber
1
Apple Pectin
fatty acid
1
Stearic Acid
Daily Value Coverage
0
Above 100% DV
0
Below 100% DV
19
%DV not reported in source
Frequently Asked Questions
What ingredients are in OPC-3 (Oligomeric Proanthocyanidins)? ▼
OPC-3 (Oligomeric Proanthocyanidins) contains 19 ingredients. By declared ingredient count it sits in the top 17% of DSLD products PlainVitamins places. Ingredients span 8 categories: sugar, other, mineral, botanical, non-nutrient/non-botanical, complex carbohydrate, fiber, fatty acid.
Who manufactures OPC-3 (Oligomeric Proanthocyanidins)? ▼
OPC-3 (Oligomeric Proanthocyanidins) is currently manufactured by Isotonix. It is classified as a Other Combinations supplement in powder form.
Is OPC-3 (Oligomeric Proanthocyanidins) still available for purchase? ▼
Yes, OPC-3 (Oligomeric Proanthocyanidins) is currently listed as on-market in the NIH DSLD database.
What is the serving size of OPC-3 (Oligomeric Proanthocyanidins)? ▼
The serving size is not specified.
What type of supplement is OPC-3 (Oligomeric Proanthocyanidins)? ▼
OPC-3 (Oligomeric Proanthocyanidins) is classified as a "Other Combinations" supplement in the NIH database. This category includes products primarily composed of other combinations ingredients. DSLD sorts every supplement into one of 9 categories overall: Vitamin, Mineral, Botanical, Amino Acid & Protein, Non-Nutrient, Fat & Fatty Acid, Multi-Vitamin & Mineral, Botanical with Nutrients, or Other Combinations.
Data Sources & Methodology
Data as of 2025. Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD).
Supplement label data sourced from the Source: NIH Dietary Supplement Label Database (DSLD),
maintained by the Office of Dietary Supplements at the National Institutes of Health.
The DSLD contains label information from dietary supplement products marketed in the United States.
Daily Value (DV) percentages are based on Source: FDA 21 CFR 101.9 Reference Daily Intake (RDI) values for adults. Products marked "Off Market"
may no longer be available for purchase but their label data remains in the database for reference.
Disclaimer, Not Medical Advice
Label data from the Source: NIH Dietary Supplement Label Database (DSLD). This information is for educational and reference purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting, stopping, or combining any dietary supplement, especially if you are pregnant, nursing, take prescription medication, or have a medical condition.