# Oligonol (Lychee fruit extract)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/oligonol
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-02
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** Litchi chinensis extract, Low-molecular-weight lychee polyphenols, Oligomerized lychee extract, LMP (Low Molecular weight Polyphenols), Lychee oligomeric proanthocyanidins, Processed lychee fruit extract

## Overview

Oligonol is a patented lychee fruit extract standardized for low-molecular-weight oligomeric proanthocyanidins (OPCs), primarily derived from polyphenols such as catechin and epicatechin. It exerts antioxidant and [anti-inflammatory](/ingredients/condition/inflammation) effects by scavenging [reactive oxygen species](/ingredients/condition/antioxidant) and inhibiting NF-κB-mediated cytokine signaling, with additional benefits for microcirculation via nitric oxide upregulation.

## Health Benefits

• [Antioxidant protection](/ingredients/condition/antioxidant): Scavenges free radicals (DPPH/ABTS) with potency comparable to ascorbic acid (animal studies)
• [Anti-inflammatory](/ingredients/condition/inflammation) effects: Modulates cytokines and inhibits UVB-induced COX-2 and collagenase (mechanism studies)
• Circulation support: Increases nitric oxide production for improved blood flow (in vitro evidence)
• Pancreatic protection: Protects against oxidative damage at 10-20 mg/kg doses (animal models)
• Gastric health: Attenuated reflux esophagitis and gastric ulcers in rodents at 100 mg/kg (PMID: 29243969)

## Mechanism of Action

Oligonol's low-molecular-weight oligomeric proanthocyanidins directly scavenge DPPH and ABTS [free radical](/ingredients/condition/antioxidant)s while upregulating endothelial nitric oxide synthase (eNOS), increasing NO bioavailability to improve peripheral microcirculation. It suppresses the NF-κB signaling pathway, reducing transcription of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s including TNF-α, IL-6, and IL-1β. Additionally, Oligonol inhibits UVB-induced COX-2 expression and matrix metalloproteinase activity (collagenase/MMP-1), protecting dermal collagen integrity.

## Clinical Summary

A randomized, double-blind, placebo-controlled trial in 50 obese adults found that 200 mg/day of Oligonol for 12 weeks significantly reduced visceral fat, subcutaneous fat, and waist circumference compared to placebo. A separate pilot study (n=22) demonstrated improved skin texture scores and reduced facial wrinkle depth after 12 weeks of 100 mg/day supplementation, with statistically significant increases in skin moisture. Circulatory studies in small cohorts (n=10–20) documented measurable increases in peripheral blood flow markers associated with eNOS upregulation. Evidence is promising but limited by small sample sizes, short durations, and the fact that most trials were industry-sponsored, warranting independent replication.

## Nutritional Profile

Oligonol is a proprietary polyphenol-rich extract derived from lychee (Litchi chinensis) fruit, standardized and processed via a patented oligomerization technology that converts high-molecular-weight proanthocyanidins (polymeric tannins) into low-molecular-weight oligomeric forms (catechin monomers and dimers/trimers) to enhance bioavailability. Key bioactive compounds include: oligomeric proanthocyanidins (OPCs, primarily catechin and epicatechin oligomers, constituting ~15–20% of extract by weight), catechin monomers (~5–10%), epicatechin (~3–7%), procyanidin B2 and related dimers, and small amounts of quercetin glycosides. The oligomerization process specifically targets conversion of polymeric tannins (MW >3000 Da) into oligomers (MW 300–1500 Da), which exhibit significantly improved intestinal absorption compared to native polymeric proanthocyanidins. Typical commercial dosage is 100–200 mg per serving. Macronutrient content is negligible at functional doses (no meaningful protein, fat, or carbohydrate contribution). Micronutrient content is minimal; trace amounts of naturally occurring copper and manganese from the fruit matrix may be present but are below nutritionally relevant thresholds. Fiber content is effectively absent in the concentrated extract form. Bioavailability: The oligomeric catechin units are absorbed in the small intestine with estimated bioavailability of 15–30% (plasma Cmax reached within 1–2 hours post-ingestion in pharmacokinetic studies), substantially higher than unprocessed lychee polyphenols or grape seed proanthocyanidins of comparable origin. Urinary excretion studies confirm presence of catechin, epicatechin, and methylated/glucuronidated metabolites. The extract also contains green tea-derived catechins (notably EGCG and EGC) added during the proprietary manufacturing process, contributing an additional ~10–15% of total polyphenol content, which further enhances [antioxidant](/ingredients/condition/antioxidant) capacity.

## Dosage & Preparation

Clinically studied doses range from 200-600 mg/day orally for up to 3 months in human safety trials. Proposed supplement use is 200 mg/day. Animal studies used 10-20 mg/kg/day orally or 100 mg/kg for acute effects. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Oligonol is generally well tolerated at doses of 100–200 mg/day, with no serious adverse events reported in clinical trials lasting up to 12 weeks; mild gastrointestinal discomfort has been noted in isolated cases. Due to its vasodilatory effects via nitric oxide, caution is warranted when combining Oligonol with antihypertensive drugs or phosphodiesterase-5 inhibitors (e.g., sildenafil), as additive [blood pressure](/ingredients/condition/heart-health) lowering may occur. Its polyphenolic constituents may inhibit CYP1A2 and CYP3A4 enzymes in vitro, potentially altering [metabolism](/ingredients/condition/weight-management) of drugs such as warfarin, statins, or certain immunosuppressants, though clinical significance has not been established. Safety data during pregnancy and lactation are insufficient; use is not recommended in these populations without medical supervision.

## Scientific Research

Research includes over 80 publications and 30 human clinical trials according to manufacturers, though specific RCT details are limited. One published animal study (PMID: 29243969) demonstrated protective effects against reflux esophagitis and gastric ulcers in rats and mice. Human safety trials confirmed tolerability at 200-600 mg/day for 3 months with no adverse events, but detailed efficacy RCTs with outcomes are not provided in available literature.

## Historical & Cultural Context

Lychee fruit, the primary source of Oligonol, has a long history of safe consumption in Asian diets. While the fruit itself is traditionally consumed, no specific traditional medicine systems or historical therapeutic uses are documented for Oligonol's concentrated polyphenols.

## Synergistic Combinations

Vitamin C, resveratrol, quercetin, green tea extract, grape seed extract

## Frequently Asked Questions

### What is Oligonol and how is it different from regular lychee extract?

Oligonol is a patented, bioavailability-enhanced lychee fruit extract produced through a proprietary oligomerization process that converts large, poorly absorbed polyphenols into low-molecular-weight OPCs (primarily catechin and epicatechin oligomers). Standard lychee extracts contain high-molecular-weight polyphenols with limited intestinal absorption, whereas Oligonol's smaller molecular structures are more readily taken up by the gut epithelium, achieving higher plasma concentrations at equivalent doses.

### What dose of Oligonol is used in clinical studies?

Published human clinical trials have used doses ranging from 100 mg/day to 200 mg/day of Oligonol, typically taken once daily with meals. The 100 mg/day dose has been studied primarily for skin health outcomes, while 200 mg/day was used in metabolic and body composition trials; no dose-ranging study has yet established a definitive optimal dose for specific health outcomes.

### Does Oligonol actually reduce wrinkles or improve skin appearance?

A small double-blind pilot trial (n=22) found that 100 mg/day of Oligonol for 12 weeks produced statistically significant improvements in skin moisture, elasticity, and a measurable reduction in facial wrinkle depth scores compared to placebo. These effects are attributed to inhibition of MMP-1 (collagenase), suppression of UVB-induced COX-2, and increased dermal collagen preservation, though the study was small and industry-funded, so results should be interpreted cautiously pending larger independent trials.

### How long does it take for Oligonol to produce noticeable benefits?

Most clinical trials report measurable outcomes after 8–12 weeks of continuous daily supplementation at 100–200 mg/day. Skin texture and moisture improvements in published studies were observed at the 12-week mark, while circulatory changes (peripheral blood flow improvements linked to eNOS upregulation) have been detected in shorter-term studies of 4–8 weeks. No data currently support expecting significant benefits in under four weeks.

### Can Oligonol be taken with blood pressure medications?

Oligonol stimulates eNOS activity, increasing nitric oxide production and promoting vasodilation, which may potentiate the blood pressure-lowering effects of antihypertensive agents such as ACE inhibitors, calcium channel blockers, or beta-blockers. Combining Oligonol with these medications could increase the risk of hypotension, particularly in individuals with already-controlled blood pressure. Consulting a healthcare provider before combining Oligonol with any antihypertensive or vasodilatory drug is strongly advised.

### Is Oligonol safe for pregnant or breastfeeding women?

Clinical safety data specifically for Oligonol during pregnancy and breastfeeding is limited, so supplementation is not recommended without consulting a healthcare provider. Most prenatal guidelines suggest avoiding novel or under-studied botanical extracts as a precaution, even though lychee fruit itself is a food. If interested in antioxidant support during this period, discussing safer, well-established alternatives with your obstetrician is advisable.

### What is the difference between Oligonol and other lychee or polyphenol supplements?

Oligonol is a proprietary, standardized extract that uses a low-molecular-weight polyphenol technology (often called nano-polyphenols) designed to enhance absorption compared to whole lychee fruit powder or standard extracts. This processing concentrates the active proanthocyanidins and creates smaller molecular forms that may cross the skin barrier more effectively, which is why Oligonol is promoted for skin benefits while other lychee extracts are typically marketed for general antioxidant support.

### Does Oligonol interact with blood sugar medications or diabetes treatments?

While Oligonol has shown some pancreatic protective effects in animal models, there is insufficient clinical evidence to confirm interactions with diabetes medications like metformin or insulin. Anyone taking blood sugar-regulating drugs should inform their healthcare provider before adding Oligonol, as polyphenol-rich extracts can theoretically affect glucose metabolism and medication efficacy.

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