Everything DoseRank tracks on the oligomeric proanthocyanidins (opc) shelf — Grape Seed Extract. The category itself is never ranked: 6 products get scored the moment you say what you want them to do.
How to read the scores
This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →
Answer a few questions about your goals, habits, stack, and budget. Then, DoseRank will find the products that best match your needs based on your answers. It's free and only takes 60 seconds! No account is required.
A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.
Questions
Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value — computed for the goal you picked, across this category's products. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.
Start with a goal, not a brand
Browsing oligomeric proanthocyanidins (opc) supplements without a goal makes no sense — different products do different jobs, and “best” flips depending on which job you're hiring for. These are the 17 health outcomes that matter for this category. Pick yours, and the full evidence-ranked shelf loads for that goal alone.
EdemaSwelling due to excess fluid accumulation.5 rankedModerate-strong
Resting heart rateBaseline heart rate measured at rest.5 rankedStrong
Vascular functionOverall health and reactivity of the circulatory system.5 rankedModerate-strong
Nitric oxide bioavailabilityAvailability of nitric oxide relevant to vascular function.5 rankedModerate-strong
C-reactive proteinAcute-phase inflammatory marker.5 rankedLimited
Oxidative stress biomarkersLaboratory indicators of oxidative damage or redox imbalance.5 rankedModerate-strong
TolerabilityOverall ability to continue the intervention without unacceptable side effects.1 rankedModerate-strong
Insulin sensitivityEfficiency of tissue response to insulin.3 rankedLimited
Antioxidant capacityMeasured ability to counter oxidative stress.5 rankedModerate-strong
Thiamine statusBiochemical sufficiency of vitamin B1.1 rankedStrong
Blood pressureArterial pressure; direction of benefit depends on baseline status.5 rankedStrong
NauseaFeeling of sickness or urge to vomit.1 rankedStrong
Vitamin B6 statusBiochemical sufficiency of pyridoxine-related compounds.1 rankedStrong
HomocysteineAmino acid marker linked with vascular and methylation status.1 rankedStrong
Fasting blood glucoseBlood glucose after fasting.2 rankedLimitedNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best oligomeric proanthocyanidins (opc) supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 6 products against that goal's trials.