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The MPC Research File: Every Published Study on Muscadine, Accurately Scoped

Hands holding Noble muscadines.

If you’re making a sourcing decision about muscadine, you need to know exactly what the published research shows — not a summary, not a highlight reel. Every study specifically on muscadine relevant to supplement formulation, with design, population, and findings clearly stated.

If you’re a formulator evaluating muscadine as an ingredient, this is your research starting point. Share it with your R&D team. Let your regulatory counsel work from these citations. Build your formula on what the research supports.

Study 1: Banini et al. — Metabolic Markers in T2D Subjects

Banini AE et al. Nutrition 2006; 22(11–12):1137–1145. North Carolina State University.
Study typeDietary intervention. Non-randomized. 28 days.
PopulationType 2 diabetic subjects (assigned to muscadine juice, wine, or dealcoholized wine) and non-diabetic subjects (juice only)
Intervention150 mL/day of muscadine grape juice, wine, or dealcoholized wine with meals
Key findingDiabetics given muscadine wine and dealcoholized wine showed lower blood glucose, insulin, and glycated hemoglobin compared to diabetics given juice. Significant improvement in fasting insulin only in the dealcoholized wine group.
LimitsNon-diabetic group received juice only — no comparison arm across product types. No placebo control. Beverage forms only — not encapsulated extract. Cannot generalize findings to healthy populations.

What this gives a formulator: peer-reviewed human research on muscadine and metabolic markers in a population where those markers matter. What it doesn’t give: evidence of metabolic benefit in healthy adults or in capsule supplement form.

Study 2: Mellen et al. — Cardiovascular Markers in Cardiac Risk Population

Mellen PB et al. J Am Coll Nutr 2010; 29(5):469–475. Hypertension Center of Excellence, Hattiesburg Clinic.
Study typeRandomized, double-blind, placebo-controlled crossover trial. 4 weeks each, 4-week washout.
Population50 adults with coronary disease or ≥1 cardiac risk factor
InterventionMuscadine grape seed supplement at 1,300 mg/day vs. placebo
Key findingPrimary endpoint (FMD): not statistically significant (p=0.06). Secondary finding: significant increase in resting brachial diameter (p=0.002) — clinical significance not yet established. No significant change in inflammation, lipid peroxidation, or antioxidant capacity biomarkers.
LimitsPrimary endpoint not met. Secondary finding of unclear clinical significance. Authors called for more research.

What this gives a formulator: one of the most rigorous study designs in nutritional science, applied specifically to muscadine grape seed in a cardiovascular risk population. That research credential is real, even though the primary endpoint wasn’t met. What it doesn’t give: evidence of cardiovascular benefit.

Study 3: Ghanim et al. — Oxidative Stress in a Meal Challenge

Ghanim H et al. J Clin Endocrinol Metab 2011; 96(5):1409–1414. State University of New York at Buffalo.
Study typeHuman meal challenge trial. Randomized crossover with placebo. 10 subjects.
Population10 healthy adults. High-fat, high-carbohydrate meal challenge.
InterventionCombination supplement containing resveratrol AND muscadine grape polyphenols — not muscadine alone
Key findingThe combination supplement reduced meal-induced oxidative and inflammatory stress markers and stimulated Nrf-2 antioxidant transcription factor activity compared to placebo.*
LimitsCombination supplement — muscadine’s specific contribution cannot be isolated from resveratrol’s. Small study (n=10). Meal challenge context only, not general supplementation.

What this gives a formulator: peer-reviewed human evidence that a resveratrol-and-muscadine polyphenol combination affected oxidative stress markers during a meal challenge, including Nrf-2 activation. What it doesn’t give: evidence that muscadine alone produces these effects, or that the same effects occur in a general supplementation context.

Study 4: Patil et al. — Cardiac Damage in an Animal Hypertension Model

Patil PD et al. Antioxidants 2022; 11(10):2026. Wake Forest University School of Medicine.
Study typeAnimal model study. Rodent (Sprague Dawley rats). 4 weeks.
PopulationMale rats with angiotensin II-induced hypertension
InterventionMuscadine grape skin/seed extract supplement vs. control
Key findingMGES did not affect blood pressure but attenuated hypertension-induced diastolic dysfunction markers (E/e’ ratio) in the animal model. Researchers observed reductions in oxidative stress markers and macrophage infiltration in cardiac tissue.
LimitsAnimal model only — findings in rats do not directly establish human outcomes. Results are mechanistic and hypothesis-generating, not clinically conclusive.

What this provides a formulator: peer-reviewed research from Wake Forest University School of Medicine on a muscadine skin/seed extract and cardiovascular-relevant endpoints in an animal model. What it doesn’t provide: human clinical evidence.

What the Full Research File Means for Your Formula

Four published studies specifically on muscadine. Two human trials, one human meal challenge using a combination supplement, and one animal model. That’s a meaningful research base for a botanical ingredient — and we’re presenting every limitation alongside every finding so your team can evaluate them accurately.

Here’s what you can build on, honestly:

  • Muscadine has been studied in peer-reviewed human research in metabolic and cardiovascular contexts — areas where formulators face the most scrutiny over ingredient credentials
  • The research spans three institutions: North Carolina State University, Hattiesburg Clinic, and Wake Forest University School of Medicine.
  • The compound profile studied — skin, seed, juice, and combination forms — maps directly to the ingredient forms MPC supplies.
  • No study produced a definitive positive primary outcome in a healthy general population, so your label claims need to be based on structure/function language, with guidance from regulatory counsel
  • Your regulatory counsel and R&D team are best positioned to determine how this research base supports your specific formula and claims.

Paulk Vineyards grows muscadines. MPC processes everything on-site. 800+ acres in Wray, Georgia. Seventh generation on the farm, fourth with muscadines. We can provide full documentation for every study cited here.

Request the full research file or a sample at muscadineproducts.com.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Research references cited include human dietary intervention studies, a human meal-challenge trial using a combination supplement, and an animal model study. Findings from each study reflect what was observed in the specific study population and design described; they do not establish that any MPC muscadine ingredient product produces the same effects. The Ghanim et al. (2011) study used a combination of resveratrol and muscadine polyphenols; muscadine’s independent contribution cannot be isolated from that data. The Patil et al. (2022) study was conducted in an animal model; findings do not directly establish human outcomes. Formulators should consult qualified regulatory counsel before establishing label claims for finished consumer products.  

Muscadine Products Corporation  •  Wray, Georgia  •  muscadineproducts.com
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Four Generations Taught Me This About Your Heart

Papa Jacob & The Vine.

This is the final post in the Built to Last series on cardiovascular health. I want to close it differently than I’ve closed the others.

My grandfather — Jacob W. Paulk, Sr. — planted the first muscadine vines on this farm around 1970. He did so on the advice of an extension agent named Jay Edd Leger, who thought muscadines might be a good fit for South Georgia. My grandfather took that advice, put the vines in the ground, and tended them for decades.

Later in his life, Papa Jacob did something that impressed me as much as anything else he ever did. He changed his diet almost entirely — raw fruits and vegetables, minimal processed food, and, under his doctor’s supervision, eventually set aside virtually all his prescription medications. He made a smoothie every morning with his first iteration of muscadine supplements and whatever else he had on hand. You could find him riding the vineyard rows with that smoothie in his hand most mornings.

He was deliberate about it. Unhurried. Not dramatic. He just decided what he was going to tend, and he tended it.

That’s the thing about the long game. It doesn’t announce itself. You don’t see the results while they’re building. You just show up again the next morning, do the same small thing, and trust that faithfulness produces.

The vine doesn’t know it’s being faithful. It just grows because it’s been tended.

I think about that when I think about cardiovascular health. Your heart has been beating faithfully since before you were born. It doesn’t take days off or need encouragement to keep going. It just works. The question is whether you’re giving it what it needs to keep working well — not just this month, but for years.

That’s what this series has been about. Not a program you start and finish. A decision you make every morning about what you’re going to tend to.

Resveratrol
The Long Game
Found in skin and seed		Resveratrol doesn’t show up quickly. It’s studied for what it may support over time — the kind of investment that doesn’t announce itself in the moment but rewards patient, daily tending. The same kind Papa Jacob practiced every morning on this farm.

Purple Power is made from the skin of the Noble muscadine — the same variety my grandfather planted, grown by my father, Gary, and my son, Seth, on the same land in Irwin County, Georgia. Research on the Noble muscadine and cardiovascular health is real and growing. The sourcing is traceable to a specific family on a specific farm.

But the reason I’m still here, still doing this, has less to do with the research and more with watching an old man ride the vineyard rows with a smoothie in his hand and live well because he chose to tend what mattered.

That’s the model. That’s what Built to Last means.

The only way to miss what this builds is to stop before it has time to show.

Thank you for following this series. The habit is yours now. Tend it.

#TendWhatLasts

Chris Paulk

President, Muscadine Products Corporation  |  Founder, Nobility Naturals

Paulk Vineyards, Irwin County, Georgia

Tend it daily.

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These statements have not been evaluated by the Food and Drug Administration. Nobility Naturals products are not intended to diagnose, treat, cure, or prevent any disease.

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What the Polyphenol-Vascular Research Landscape Tells a Formulator — and What Muscadine Brings to It

Wray, Georgia, evening light over the lake. Some weeks get away from you. The vine keeps growing regardless.

If you’ve been following this cardiovascular series, you have the research pieces — the Mellen study breakdown, the credibility bar, the CFIC consumer signal. What ties it all together is the broader polyphenol-vascular research landscape: where does muscadine actually sit within the published science?

That’s what this week covers.

If you’re evaluating muscadine for a cardiovascular formula, this is the post that completes the picture.

The Polyphenol-Vascular Research Base: What’s There

The body of published human research on dietary polyphenols and vascular health is substantial and growing. A 2022 systematic review in Nutrients by Grosso et al. examined evidence from human studies on dietary polyphenol intake, blood pressure, and vascular health. The review found associations between polyphenol-rich food intake — particularly anthocyanin-rich fruits — and blood pressure outcomes, with proposed mechanisms including modulation of the nitric oxide pathway and antioxidant activity in vascular tissue. *

The nitric oxide pathway is worth understanding because it’s central to how polyphenols are thought to influence vascular function. A 2023 review by Serreli and Deiana in Antioxidants examined dietary polyphenols and nitric oxide synthase activity across in vivo and in vitro studies. The proposed mechanism: polyphenols modulate signaling pathways that regulate endothelial nitric oxide synthase (eNOS), the enzyme responsible for producing nitric oxide in blood vessel walls. According to the reviewed literature, nitric oxide plays a key role in regulating vascular tone. *

For a formulator, understanding this mechanism matters because it links an ingredient’s phytochemical profile to a documented biological pathway — exactly the scientific rationale your R&D team needs before building a cardiovascular formula.

Where Grape-Derived Polyphenols Specifically Stand

A 2025 narrative review in Food & Function examined the impact of polyphenol-rich foods on flow-mediated dilation (FMD) — the same primary measure used in the Mellen study — across 97 published studies. The finding relevant to muscadine: grape-derived polyphenols showed a wide range of FMD responses across studies (0.8–8.7%), and the authors noted that effects are difficult to substantiate without detailed compositional or metabolomic data. *

That finding provides important context for the Mellen study. The null primary FMD result we’ve discussed throughout this month isn’t unusual for grape-derived polyphenols in the literature — FMD responses in this class vary across studies, with multiple factors affecting outcomes, including polyphenol form, dose, bioavailability, and study population. The Mellen study sits within a broader research landscape in which grape polyphenol effects on FMD are genuinely complex and not yet fully characterized.

That doesn’t diminish muscadine’s research credentials. It places them accurately within the science itself.

What Muscadine Brings to This Landscape

Muscadine (Vitis rotundifolia) contributes a well-characterized phytochemical profile to this research context: anthocyanins, OPCs, ellagic acid, and resveratrol — compounds that appear throughout the polyphenol-vascular literature. The anthocyanin content places muscadine within the compound class examined in the Grosso review’s findings on anthocyanin-rich foods and blood pressure associations. The OPC profile is examined in the context of vascular tone research. The ellagic acid and resveratrol content has been studied for their potential roles in antioxidant and anti-inflammatory pathways relevant to cardiovascular research. *

What muscadine adds that most grape-derived polyphenol ingredients don’t: a distinct botanical species with a documented phytochemical profile, a fully traceable domestic estate supply chain, and a peer-reviewed human trial in a cardiovascular risk population. The Mellen trial’s null primary result is part of the honest picture. So is the fact that it’s one of the very few randomized cardiovascular trials in the botanical supplement space.

Paulk Vineyards grows muscadines — 800+ acres in Wray, Georgia, seventh generation on the farm, fourth with muscadines. MPC processes everything on-site. That traceability allows a formulator to link the ingredient in their formula to the same botanical source studied in peer-reviewed research.

What’s Coming in August

Next week: Antioxidants + The Science. We’re compiling every published study relevant to muscadine — the full research file, accurately scoped, with populations and designs clearly stated. If you want to know exactly what the science shows before making a sourcing decision, that’s the post to read.

If you’re ready to start the sourcing conversation now — before the August research file is posted — request a sample or documentation at muscadineproducts.com.

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Midyear Check-In: Is Your Heart Health Routine Actually Working?

Purple Power cannister on a table

We’re into August now. More than halfway through the year.

For many, that’s a moment of quiet reckoning. The intentions you set in January are either part of your life by now or they’re not. You either built the routine or you didn’t. Most of us, if we’re honest, are somewhere in the middle — doing some things well, letting others slide, not entirely sure whether what we’re doing is making a difference.

Heart health tends to fall into the ‘I’ll get serious about this later’ category more than most. It’s easy to put off something that doesn’t announce itself loudly. So this week, instead of more research or sourcing stories, I want to ask three honest questions.

Three Questions Worth Asking Right Now

The first: are you doing anything consistently? Not perfectly — consistently. A habit that happens most mornings is worth far more than one that happens intensely for a week and then disappears. If the answer is no, that’s where to start. Pick one thing. Do it daily.

The second: do you know why you’re doing what you’re doing? Not the marketing version — the actual reason. If you’re taking something, do you know what’s in it, where it came from, and whether the research behind it applies to the product you’re holding? If you can’t answer that, the habit is built on a shaky foundation.

The third: is your body getting what it needs from what you’re eating and doing? Cardiovascular health is built on multiple inputs — sleep, movement, stress management, diet. Supplementation supports all of that. It doesn’t replace any of it. If the other inputs aren’t there, even the best supplement can only do so much.

Polyphenols: The Whole Story
Across the entire Noble grape		Most supplements pick one compound and sell it. Purple Power delivers the full natural plant story of the Noble muscadine skin — everything four generations of our family has been growing, in one daily scoop.

What a Simple Routine Actually Looks Like

If you answered no to the first question — or if your current routine doesn’t include any daily support for cardiovascular health — no judgment. Most people haven’t gotten there yet. Here’s what I’d suggest.

One scoop of Purple Power each morning. Add it to whatever you’re already doing — a smoothie, a glass of water, whatever fits. Don’t make it harder than it needs to be. It delivers the full natural plant compound profile of the Noble muscadine skin — grown on our farm in Irwin County, Georgia, by my father, Gary, and my son, Seth, and our crews, then processed by us. You’ve read the sourcing story. You’ve read what the research examined. This is the simplest way to put that to work every day.

The second half of the year is still yours. What you do with it starts tomorrow morning.

The Second Half

December comes whether you’re ready or not. The question isn’t whether time passes — it’s how you use it.

You don’t need a dramatic overhaul. You need one honest answer to those three questions and one consistent daily input to start building the foundation. Five months of that is enough to build something real.

Your heart has been working faithfully every day this year. It deserves the same from you for the rest of the year.

#TendWhatLasts