# Prunus maritima (Beach Plum)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/prunus-maritima
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-01
**Evidence Score:** 2 / 10
**Category:** Herb
**Also Known As:** Beach Plum, Coastal Plum, Sand Plum, Seashore Plum, Maritime Plum, Dune Plum, Shore Plum, Atlantic Beach Plum

## Overview

Beach plum (Prunus maritima) is a wild-harvested coastal shrub whose fruit is rich in proanthocyanidins, anthocyanins, and chlorogenic acid. These polyphenols primarily exert antioxidant effects by scavenging [reactive oxygen species](/ingredients/condition/antioxidant) and may inhibit bacterial adhesion in the urinary tract via A-type proanthocyanidin-receptor interference.

## Health Benefits

["\u2022 Provides Antioxidant Support: Contains phenolic compounds, flavonoids, and vitamin C that scavenge [free radical](/ingredients/condition/antioxidant)s, though evidence is limited to preclinical (in vitro) studies.", "\u2022 May Support Urinary Tract Health: High levels of proanthocyanidins exhibit antibacterial properties, but its benefit for urinary health is extrapolated from other research, as no direct human trials on beach plum exist.", "\u2022 Potentially Aids Metabolic Regulation: Phenolic compounds may help regulate [metabolism](/ingredients/condition/weight-management) at a cellular level to combat obesity-related issues, a mechanism suggested by preclinical data.", "\u2022 Exhibits [Anti-inflammatory](/ingredients/condition/inflammation) Properties: Bioactive compounds like anthocyanins and flavonoids show potential for anti-inflammatory action, based on in vitro findings.", "\u2022 Supports [Immune Function](/ingredients/condition/immune-support): The fruit is a source of vitamin C, which is known to contribute to a healthy immune response, though this is a general nutritional benefit not confirmed in specific beach plum trials."]

## Mechanism of Action

Beach plum's A-type proanthocyanidins inhibit the fimbriae-mediated adhesion of Escherichia coli to uroepithelial cell receptors, a mechanism also observed in cranberry research. Its anthocyanins and chlorogenic acid activate the Nrf2 transcription pathway, upregulating endogenous antioxidant enzymes such as superoxide dismutase and [glutathione](/ingredients/condition/detox) peroxidase. Vitamin C content further contributes to [free radical](/ingredients/condition/antioxidant) neutralization by donating electrons to oxidized biomolecules, regenerating tocopherol in lipid membranes.

## Clinical Summary

Available evidence for Prunus maritima is largely preclinical, consisting of in vitro assays measuring DPPH radical scavenging activity and bacterial adhesion inhibition in cell culture models. No randomized controlled trials or significant human cohort studies have been published specifically on beach plum supplementation or extract as of 2024. Compositional analyses of wild-harvested beach plum fruit have documented total phenolic content ranging from 300–900 mg gallic acid equivalents per 100 g fresh weight depending on geographic origin and ripeness. Given this evidence gap, any health claims must be considered preliminary and extrapolated largely from structurally related Prunus species such as Prunus avium and cranberry proanthocyanidin research.

## Nutritional Profile

Beach plum fruit (Prunus maritima) per ~100 g fresh weight (approximate values based on limited analytical data and comparison with closely related Prunus species): **Macronutrients:** Water 78–84 g; Carbohydrates 10–15 g (predominantly sugars: glucose, fructose, sucrose; dietary fiber 1.5–2.5 g); Protein 0.5–1.0 g; Fat 0.2–0.5 g. Energy ~45–60 kcal. **Vitamins:** Vitamin C (ascorbic acid) 5–15 mg (variable by ripeness and ecotype; bioavailability is high but degrades rapidly post-harvest); modest amounts of vitamin A precursors (β-carotene, estimated 50–200 µg) contributing to the purple-red skin pigmentation; small amounts of B-vitamins (thiamine, riboflavin, niacin) likely <0.1 mg each; vitamin K trace amounts (~5–10 µg estimated). **Minerals:** Potassium 150–200 mg; Calcium 10–20 mg; Magnesium 7–12 mg; Phosphorus 15–25 mg; Iron 0.3–0.5 mg; Manganese 0.05–0.15 mg; Zinc 0.1–0.2 mg; trace sodium (<3 mg). **Bioactive Compounds:** Proanthocyanidins (oligomeric and polymeric forms, predominantly B-type) estimated at 50–150 mg per 100 g fresh fruit — notably high among stone fruits, contributing astringency; total phenolics (gallic acid equivalents) approximately 200–500 mg/100 g fresh weight; anthocyanins (cyanidin-3-glucoside, cyanidin-3-rutinoside, peonidin-3-glucoside) 30–120 mg/100 g in ripe skin, responsible for deep purple coloration; flavonols including quercetin-3-rutinoside and kaempferol glycosides at 5–20 mg/100 g; hydroxycinnamic acids (chlorogenic acid, neochlorogenic acid) 20–80 mg/100 g; total carotenoids (lutein, β-carotene, β-cryptoxanthin) 0.2–1.0 mg/100 g. **Seeds/kernel:** contain amygdalin (a cyanogenic glycoside, ~1–3% of kernel dry weight), which releases hydrogen cyanide upon enzymatic hydrolysis — seeds are not consumed. **Organic acids:** Malic acid predominates (0.8–2.0 g/100 g), with lesser amounts of citric and quinic acids, contributing to the characteristically tart flavor. **Pectin:** Moderate levels (~0.5–1.0 g/100 g), which accounts for the fruit's traditional use in jam and jelly making. **Bioavailability Notes:** Anthocyanin bioavailability is generally low (1–5% absorption), though colonic metabolites (protocatechuic acid, phenylacetic acid derivatives) may exert systemic effects. Proanthocyanidins are poorly absorbed intact due to high molecular weight, but exert local [antioxidant](/ingredients/condition/antioxidant) and antibacterial effects in the gastrointestinal and urinary tracts. Chlorogenic acid is moderately bioavailable (~30%), hydrolyzed by gut microbiota to caffeic and quinic acids. Vitamin C bioavailability is high (~70–90%) when consumed fresh. Note: Comprehensive USDA nutrient database entries for Prunus maritima are lacking; values are approximate, derived from limited published analyses and extrapolated from related species (P. domestica, P. spinosa, P. americana). Significant variation exists among wild ecotypes and growing conditions along coastal habitats.

## Dosage & Preparation

No clinically studied dosage ranges, standardized forms (e.g., extract, powder), or concentrations for Prunus maritima are available, as no human trials have been conducted. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Beach plum fruit consumed as whole food or jam is generally recognized as safe, but concentrated extracts lack formal toxicological evaluation in humans. Individuals taking warfarin or other anticoagulants should exercise caution, as high polyphenol loads from Prunus species can modestly inhibit platelet aggregation and alter CYP2C9-mediated drug [metabolism](/ingredients/condition/weight-management). Those with salicylate sensitivity should note that beach plum seeds and pits contain amygdalin, a cyanogenic glycoside that can release hydrogen cyanide upon enzymatic hydrolysis and must never be consumed. Pregnant or breastfeeding individuals should limit use to culinary food amounts due to insufficient safety data on concentrated preparations.

## Scientific Research

No human clinical trials, randomized controlled trials (RCTs), or meta-analyses specifically on Prunus maritima have been identified in the research. The existing evidence is preclinical or based on general [antioxidant](/ingredients/condition/antioxidant) properties, and no PubMed PMIDs for human studies are available.

## Historical & Cultural Context

Beach plum has a long history of use as a food source among Native Americans and European colonists along the North American coast. The fruits were consumed fresh, dried, or processed into preserves like jams and jellies. This culinary legacy continues today in niche artisanal products.

## Synergistic Combinations

Cranberry Extract, D-Mannose, Vitamin C, Blueberry Extract, Quercetin

## Frequently Asked Questions

### What is beach plum good for?

Beach plum is primarily valued for its high concentration of proanthocyanidins and anthocyanins, which may provide antioxidant support and help inhibit bacterial adhesion in the urinary tract. Its total phenolic content (approximately 300–900 mg GAE per 100 g fresh fruit) rivals many better-studied berries. However, human clinical evidence is currently absent, so benefits remain supported only by in vitro data.

### Does beach plum help with urinary tract infections?

Beach plum contains A-type proanthocyanidins that, similar to those in cranberry, can interfere with the ability of E. coli to adhere to urinary tract epithelial cells in laboratory models. This anti-adhesion mechanism has not been confirmed in human UTI trials using beach plum specifically. Until clinical studies are conducted, it should not replace prescribed antibiotic therapy for active urinary tract infections.

### Is beach plum the same as cranberry for proanthocyanidins?

Both beach plum and cranberry contain A-type proanthocyanidins that inhibit bacterial fimbriae adhesion, but they are botanically distinct species from the Rosaceae family and Ericaceae family respectively. Cranberry has robust clinical trial data supporting its role in UTI prevention, while beach plum currently lacks equivalent human studies. The proanthocyanidin profile and concentration in beach plum is promising but not yet standardized for supplemental use.

### Are beach plum seeds or pits safe to eat?

No — beach plum seeds and pits contain amygdalin, a cyanogenic glycoside that is enzymatically hydrolyzed in the gut to release hydrogen cyanide, posing a toxicity risk. Only the fruit flesh is safe for consumption, and this is a common characteristic across many Prunus species including apricots, cherries, and peaches. Commercially prepared beach plum jams and preserves made from the flesh are considered safe under normal culinary use.

### What compounds give beach plum its antioxidant properties?

The primary antioxidant compounds in beach plum fruit include anthocyanins (cyanidin-3-glucoside and cyanidin-3-rutinoside), chlorogenic acid, quercetin glycosides, and vitamin C. These compounds work through both direct radical scavenging and indirect mechanisms, including activation of the Nrf2/ARE pathway that upregulates endogenous antioxidant enzymes like superoxide dismutase. The anthocyanin content varies considerably by cultivar and harvest timing, with darker-skinned fruits generally yielding higher pigment and phenolic concentrations.

### What is the difference between beach plum extract and whole beach plum fruit for supplement purposes?

Beach plum extracts concentrate proanthocyanidins and phenolic compounds, potentially delivering higher bioactive doses per serving than whole fruit. However, whole beach plum fruit provides additional fiber and nutrients that extracts may not contain, making them complementary forms depending on your health goals. Extract forms typically offer better standardization and shelf stability, while whole fruit provides a more food-based approach.

### How does beach plum compare to cranberry and blueberry for proanthocyanidin content?

While beach plum contains meaningful levels of proanthocyanidins, cranberries are significantly more studied and contain higher documented concentrations of these compounds. Blueberries provide excellent anthocyanin antioxidants but differ structurally from the proanthocyanidins found in both beach plum and cranberry. Beach plum represents a less-researched alternative that may offer similar benefits, though direct comparative human studies are limited.

### Is beach plum safe to take alongside common medications or supplements?

Beach plum's proanthocyanidins and phenolic compounds have minimal documented interactions with common medications, though comprehensive interaction studies in humans are lacking. As with any supplement high in antioxidants, there is theoretical potential for interactions with blood thinners or antiplatelet medications; consult a healthcare provider if taking such medications. Its safety profile appears favorable for most people, but individual circumstances warrant personalized medical guidance.

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