Red Clover

Trifolium pratense

Common & Folk Names

• Red Clover
• Purple Clover
• Trefoil
• Meadow Clover
• Cow Clover
• Wild Clover

Plant Family

Fabaceae (Legume/Pea Family)

Geographic Location

Native to Europe, western Asia, and northwest Africa. Now naturalised and widely distributed throughout temperate regions worldwide, including North America, Australia, and New Zealand. Commonly found in meadows, pastures, roadsides, and disturbed areas. Widely cultivated as a fodder crop and cover crop for soil improvement (nitrogen fixation).

Habitat

Red clover thrives in meadows, pastures, grasslands, and along roadsides. It prefers moderately fertile, well-drained soils and full sun to partial shade. As a member of the legume family, it forms symbiotic relationships with nitrogen-fixing bacteria in its root nodules, which improves soil quality. Often grows in mixed grassland communities and is tolerant of a wide range of soil conditions.

Growing Conditions

Sun: Full sun to partial shade

Soil: Well-drained, moderately fertile soil; pH 6.0-7.0 (slightly acidic to neutral); tolerates a range of soil types

Propagation: Easily grown from seed sown in spring or autumn. Seeds germinate readily with adequate moisture. Can also spread via stolons (creeping stems).

Care: Minimal maintenance required once established. Drought-tolerant but produces better with consistent moisture. Benefits from occasional mowing to encourage new growth. Fixes nitrogen in soil, improving fertility for companion plants.

NZ Planting Calendar

Sowing (seed): Spring to autumn (September–April)

Planting: Spring (September–November) or autumn (March–May)

Growth: Perennial (typically 2-3 years); may self-seed

Flowering: November–March (summer to autumn) – iconic pink-purple flower heads

Harvest (flowers): Throughout flowering season; best in morning after dew dries

Harvest (leaves): Year-round; most tender in spring/early summer

Note: Not native to NZ; naturalised throughout the country; nitrogen-fixing legume; common pasture plant; attracts bees

Harvesting Guidelines

Harvest flower heads when they are fully opened and vibrant in color, typically in late spring through summer. The best time is mid-morning after dew has dried but before the heat of the day causes flowers to wilt. Gently pinch or cut flower heads, leaving stems and leaves to continue growth. Harvest from areas that have not been sprayed with herbicides or pesticides. Select vibrant, fresh flowers without browning or signs of decay.

Leaves can also be harvested, though flowers are more commonly used medicinally. Dry flowers quickly in a well-ventilated, shaded area to preserve color and prevent mold. Store in airtight containers away from light and moisture.

Parts Used

• Flowers (primary)
• Flowering tops (flowers with attached upper leaves)
• Leaves (occasionally)

Constituents & their Actions

Red clover’s therapeutic actions arise from a complex interplay of phytochemical constituents, most notably its high concentration of isoflavone phytoestrogens, which in turn modulate hormonal activity and provide systemic benefits.

Isoflavones (Phytoestrogens):

These are the most extensively studied constituents in red clover, structurally similar to 17β-estradiol (human estrogen), which in turn allows them to bind to estrogen receptors (both α and β) and exert weak estrogenic or anti-estrogenic effects depending on tissue type and hormonal context. The major isoflavones in red clover are:

• Biochanin A (primary methylated isoflavone)
• Formononetin (primary methylated isoflavone)
• Genistein (aglycone form, also found in soy)
• Daidzein (aglycone form, also found in soy)

Typical red clover extracts provide 40-160mg of total isoflavones daily. These compounds are metabolised by gut bacteria, with biochanin A converting to genistein and formononetin to daidzein.

The main actions of isoflavones are:

• Phytoestrogenic (selective estrogen receptor modulation)
• Bone protective
• Cardiovascular protective
• Anti-inflammatory
• Potential chemopreventive properties

Flavonoids:

These polyphenolic compounds provide additional antioxidant and anti-inflammatory effects, which in turn protect cells from oxidative damage. Key flavonoids include:

• Quercetin
• Kaempferol
• Isorhamnetin

The main actions of these flavonoids are:

• Antioxidant
• Anti-inflammatory
• Vascular protective

Phenolic Acids:

These compounds contribute to the overall antioxidant capacity and alterative properties. Main phenolic acids include:

• Caffeic acid
• Chlorogenic acid
• Salicylic acid

The main actions of phenolic acids are:

• Antioxidant
• Anti-inflammatory
• Support liver detoxification
• Antimicrobial

Coumarins:

These aromatic organic compounds have mild anticoagulant properties, which in turn promote circulation. The main coumarin present is:

• Coumestrol (also has weak estrogenic activity)

The main action of coumarins is:

• Mild anticoagulant (supports blood flow)

Cyanogenic Glycosides:

Present in small amounts, these compounds release hydrogen cyanide when plant tissues are damaged, which in turn may contribute to antispasmodic effects.

The main action is:

• Mild antispasmodic

Minerals & Vitamins:

Red clover is nutritionally dense, providing significant amounts of:

• Calcium
• Magnesium
• Potassium
• Phosphorus
• Iron
• Vitamins (including vitamin C, thiamine, niacin)

4The main action is:

• Nutritive tonic

Actions with Mechanisms

Alterative (Blood Purifier/Depurative):
Red clover’s reputation as an “alterative” or “blood purifier” reflects its ability to support the body’s natural elimination processes through multiple mechanisms. The flavonoids and phenolic acids enhance hepatic detoxification enzymes, which in turn increases the liver’s capacity to process and eliminate metabolic wastes and toxins. The mild anticoagulant properties from coumarins improve blood fluidity, which in turn facilitates better circulation and nutrient delivery to tissues. The isoflavones and other constituents support lymphatic movement, which in turn clears cellular debris and inflammatory metabolites from interstitial spaces. This multifaceted action addresses what traditional herbalists called “bad blood” – essentially lymphatic congestion, poor elimination, and accumulation of metabolic wastes that manifest as chronic skin conditions, swollen glands, and systemic inflammation.

Lymphatic Tonic/Decongestant:
Red clover stimulates lymphatic circulation and drainage, which in turn reduces lymphatic congestion and swelling. While the exact mechanisms are not fully elucidated, the alterative properties likely enhance fluid movement through lymphatic vessels and support the clearing of cellular debris. This action makes red clover particularly valuable for swollen lymph nodes, chronic lymphatic congestion, and conditions with poor lymphatic drainage. Historically used for scrofula (tuberculous lymphadenitis), which in turn demonstrates its traditional application to lymphatic swellings.

Phytoestrogenic (Selective Estrogen Receptor Modulation):
The isoflavones in red clover (genistein, daidzein, biochanin A, formononetin) bind to estrogen receptors α and β with varying affinities, which in turn produces selective estrogen receptor modulator (SERM) effects. In low-estrogen environments (such as menopause), these compounds provide mild estrogenic activity, which in turn alleviates symptoms like hot flashes, night sweats, and vaginal dryness. In high-estrogen environments, they may block stronger endogenous estrogens through competitive binding, which in turn provides a balancing effect. Unlike synthetic hormone replacement therapy, red clover isoflavones appear to have beneficial or neutral effects on breast and endometrial tissue (they don’t significantly increase mammographic density or stimulate endometrial growth), while supporting bone density and cardiovascular health. This tissue-selective activity makes red clover a safer alternative to conventional HRT for many women.

Skin Healing (Internal & Topical):
Red clover addresses chronic skin conditions through its alterative, anti-inflammatory, and immune-modulating actions. The isoflavones (particularly biochanin A and genistein) demonstrate immune-boosting properties, which in turn enhances the skin’s ability to resist bacterial colonisation and infection – particularly important in conditions like eczema where Staphylococcus aureus colonisation is common. The phenolic acids (caffeic acid, chlorogenic acid) reduce inflammatory mediators, which in turn decreases redness, itching, and inflammation associated with eczema, psoriasis, and acne. In psoriasis specifically, research suggests red clover may bind endotoxins (fragments of gram-negative gut bacteria) that cross the intestinal barrier and trigger abnormal skin cell proliferation, which in turn reduces plaque formation. The hepatic support enhances detoxification of gut-derived toxins through the portal circulation, which in turn reduces the toxic burden that can manifest as skin eruptions. Topically, red clover provides soothing, anti-inflammatory effects for wounds, rashes, and irritated skin.

Bone Protective (Anti-Osteoporotic):
The phytoestrogenic isoflavones (especially genistein and daidzein) bind to estrogen receptors on bone cells, which in turn provides protective effects similar to endogenous estrogen. Through genomic mechanisms, they activate or modulate estrogen receptors on osteoblasts (bone-building cells), which in turn promotes bone formation. Through non-genomic mechanisms, they inhibit tyrosine kinase and topoisomerase II enzymes, which in turn reduces osteoclast-mediated bone resorption. The isoflavones also stimulate osteoblasts to release inhibitory cytokines, which in turn further suppresses osteoclast activity. This dual action of promoting bone formation while inhibiting bone breakdown helps maintain bone mineral density, particularly in postmenopausal women experiencing estrogen-deficient bone loss.

Cardiovascular Protective:
Multiple mechanisms contribute to red clover’s cardiovascular benefits. The isoflavones improve arterial compliance (flexibility), which in turn reduces arterial stiffness and improves blood pressure regulation. They may modestly improve lipid profiles by inhibiting cholesterol synthesis and increasing fecal bile acid excretion, which in turn lowers LDL cholesterol and triglycerides while potentially raising HDL cholesterol. The antioxidant flavonoids and phenolic acids protect LDL cholesterol from oxidation, which in turn prevents the formation of oxidised LDL that contributes to atherosclerotic plaque development. The mild anticoagulant properties improve blood flow and may reduce thrombosis risk. These combined effects support cardiovascular health, particularly important for postmenopausal women whose cardiovascular risk increases significantly after estrogen decline.

Respiratory Support (Antispasmodic & Expectorant):
Red clover has traditional use for respiratory conditions, particularly whooping cough and spasmodic coughs. The cyanogenic glycosides (in small, safe amounts) and other constituents provide mild antispasmodic effects, which in turn relaxes bronchial smooth muscle and reduces cough spasms. The herb’s lymphatic and alterative properties help clear accumulated mucus from respiratory passages, which in turn provides expectorant benefits. While historical sources note that red clover “doesn’t work for all cases” of whooping cough, when indicated it can provide significant relief. Modern herbalists often combine it with moistening herbs (marshmallow, licorice, violet) for dry, spasmodic coughs.

Anti-Inflammatory & Antioxidant:
The flavonoids (quercetin, kaempferol, isorhamnetin) and phenolic acids neutralise free radicals and reduce oxidative stress, which in turn protects cellular structures, lipids, and DNA from damage. These compounds also inhibit inflammatory enzymes and pathways, which in turn reduces the production of pro-inflammatory mediators. The isoflavones themselves demonstrate anti-inflammatory activity through modulation of inflammatory signaling cascades. These combined antioxidant and anti-inflammatory effects contribute to red clover’s systemic benefits across multiple organ systems.

Main Use

Red clover’s main uses span two primary areas: hormonal support for menopausal women and skin health support through its alterative/lymphatic properties.

For menopause, red clover provides a gentler alternative to conventional hormone replacement therapy, addressing hot flashes, night sweats, mood changes, and supporting bone and cardiovascular health through its phytoestrogenic isoflavones. Clinical evidence suggests that 40-80mg of isoflavones daily can significantly reduce menopausal symptoms, particularly in women with severe hot flashes (5+ per day).

As an alterative and lymphatic tonic, red clover is valued for chronic skin conditions including eczema, psoriasis, acne, and general lymphatic congestion with swollen glands. The herb supports the body’s natural elimination processes, reducing the metabolic waste and inflammatory burden that manifests as skin eruptions and chronic inflammation. This makes it particularly valuable for children with eczema or chronic skin issues.

Red clover also serves as a nutritive tonic, providing vitamins, minerals, and phytonutrients that support overall vitality.

Preparations

Infusion/Tea: 1-2 teaspoons (2-4g) of dried flower heads per cup of boiling water, steeped covered for 10-15 minutes. Drink 2-3 cups daily for alterative and hormonal support.

Nourishing Infusion (Overnight): 1 ounce (28g) of dried flowers in 1 quart (1 litre) of boiling water, steeped overnight (4-8 hours). Strain and drink throughout the day. This method extracts maximum nutritive content including minerals.

Tincture: Fresh flowering tops (1:2 in 40-50% alcohol) or dried flowers (1:5 in 40% alcohol). Take 2-5 mL, 2-3 times daily.

Fluid Extract: 1-2 mL, 3 times daily.

Standardised Extract: Commercial red clover supplements (such as Promensil) typically provide 40-80mg of total isoflavones per dose. Follow manufacturer’s recommendations, usually 40-80mg isoflavones daily for menopausal symptoms.

Topical Compress/Wash: Strong infusion (4-6 teaspoons per cup), cooled to comfortable temperature, applied to affected skin with clean cloth 2-3 times daily for eczema, psoriasis, wounds, or rashes.

Poultice: Fresh or dried flowers moistened and applied directly to skin inflammations, wounds, or sore areas.

Vinegar Extract: Pack jar with fresh or dried flowers, cover completely with apple cider vinegar, steep 4-6 weeks, strain. Take 1-2 tablespoons daily as a nutritive tonic, diluted in water or added to salad dressings.

Food: Fresh flowers can be added to salads, soups, or fried as fritters for nutritive benefits. Sweet tasting and safe to consume.

Dosage

Dried Flowers (Tea): 2-4g, 2-3 times daily

Nourishing Infusion: 1-3 cups daily of overnight infusion

Tincture (1:5, 40%): 2-5 mL, 2-3 times daily

Fluid Extract: 1-2 mL, 3 times daily

Standardised Isoflavone Extract: 40-80mg isoflavones daily for menopausal support; 80mg appears optimal for hot flash reduction

Topical Applications: Apply infusion, compress, or poultice to affected areas 2-3 times daily as needed

Vinegar Extract: 1-2 tablespoons daily, diluted

Duration: Red clover is safe for long-term use (studies show safety up to 2 years with standardised extracts). For chronic conditions, use consistently for 3-6 months to see full benefits.

Safety & Drug Interactions

Scientific Evidence

Menopausal Hot Flashes: Evidence is mixed. Several systematic reviews and meta-analyses show conflicting results. Some studies show significant reduction in hot flashes with 40-80mg isoflavones daily, particularly in women with severe symptoms (5+ hot flashes daily), while other trials show minimal benefit compared to placebo. A 2021 meta-analysis found clinically meaningful reduction in hot flash frequency and severity with red clover extract. Individual response varies significantly. High-quality studies show 40-80mg daily can reduce hot flashes by 30-50% in responsive individuals.

Bone Mineral Density: Results are inconsistent. Some studies show red clover isoflavones significantly reduce bone mineral density loss in lumbar spine and femoral neck in postmenopausal women, while others show no significant effect compared to placebo. A study using 37mg isoflavones daily for 12 weeks showed less BMD loss compared to placebo. Mechanism of action (estrogen receptor activation, osteoclast inhibition) is well-established, but clinical significance requires more research.

Cardiovascular Effects: Red clover improves arterial compliance (flexibility) in postmenopausal women, which in turn supports healthy blood pressure. Evidence for lipid-lowering effects is mixed – some trials show modest reductions in LDL cholesterol and triglycerides, others show no significant changes. Red clover does not increase risk of blood clots or adverse cardiovascular events, unlike some synthetic hormones. Overall cardiovascular benefits appear modest but safe.

Skin Conditions: Traditional use for eczema, psoriasis, and acne is extensive and well-documented in historical herbal texts. Modern scientific validation is limited. Small studies from the 1940s-1960s showed red clover (often combined with sarsaparilla) helped 70-80% of psoriasis patients, particularly those with chronic, large-plaque psoriasis. Mechanisms (endotoxin binding, anti-inflammatory effects, immune modulation) are scientifically plausible. Modern herbalists continue to report clinical success, but high-quality contemporary trials are lacking.

Breast Cancer: In vitro studies show mixed effects – some isoflavones stimulate estrogen-receptor positive breast cancer cells, while biochanin A inhibits aromatase (protective effect). Red clover does not appear to increase mammographic breast density (unlike synthetic HRT), which is considered favorable. Overall breast cancer risk/safety remains unclear and controversial. Use is not recommended for those with history of estrogen-receptor positive breast cancer without oncologist approval.

Prostate Health: Preliminary in vitro research suggests red clover may inhibit growth of normal prostate cells and increase resistance of prostate cancer cells to radiation. Further research needed.

Respiratory Conditions: Historical use for whooping cough is well-documented in Eclectic medical texts, though noted to “not work for all cases.” No modern clinical trials on respiratory applications.

Evidence Level: Extensive traditional use over centuries; Moderate evidence for menopausal symptoms with mixed results; Limited evidence for bone and cardiovascular benefits; Strong mechanistic understanding of phytoestrogenic activity; Lacking high-quality evidence for skin conditions despite extensive traditional use; Generally safe profile confirmed by clinical trials.

Western Energetics

Temperature: Cooling. Red clover clears heat from the blood and tissues, particularly useful for inflammatory “hot” skin conditions and conditions of excess.

Moisture: Moistening to neutral. Provides nourishing, building qualities through nutritive content, though not as profoundly moistening as mucilaginous herbs.

Tissue State: Primarily for Heat/Excitation (inflammation, skin eruptions, hot flashes) and Depression/Atrophy (tissue depletion, deficiency states requiring nourishment). The cooling, alterative properties address heat and stagnation, while the nutritive aspects address depletion.

Taste

Sweet: The primary taste, reflecting the nutritive, nourishing, building qualities of the herb and its mineral content

Mildly Salty: Subtle salty quality relates to mineral content and lymphatic/blood cleansing actions

Fresh: Clean, pleasant flavor when fresh; flowers have a delicate, slightly honey-like sweetness

The sweet, mild taste makes red clover very palatable in teas and as food, contributing to its use as a nourishing tonic herb.

Plant Lore

Red clover’s Latin name Trifolium comes from “tri” (three) and “folium” (leaf), referring to its characteristic three-lobed leaves. In folklore, the three leaves were said to represent faith, hope, and love, while the rare four-leaf clover was considered extremely lucky, with the fourth leaf representing luck itself. Finding a four-leaf clover was believed to bring good fortune, the ability to see fairies, and protection from evil spirits.

Red clover has been cultivated as a fodder crop for livestock since ancient times, valued for its high protein content and ability to improve soil through nitrogen fixation. However, farmers eventually discovered that excessive red clover in pastures could cause fertility problems in sheep (“clover disease”), leading to investigations in the 1930s-1940s that identified the isoflavone compounds responsible for these estrogenic effects. This research ultimately led to recognition of red clover’s potential therapeutic applications for human hormonal health.

In the 19th century, red clover became a prominent ingredient in “blood purifier” formulas. In 1898, it was listed in King’s American Dispensatory, the authoritative text for Eclectic physicians. Parke-Davis (now part of Pfizer) marketed “Syrup Trifolium” containing red clover, burdock, poke root, and Oregon grape as a blood purifier. Red clover later became the base ingredient for the famous Hoxsey Formula, a controversial cancer treatment used in the early-to-mid 20th century, and it’s also a primary ingredient in Essiac tea, another traditional cancer formula. While red clover’s anti-cancer properties remain unproven in humans, the historical use reflects traditional beliefs in its blood-cleansing and lymphatic-supporting properties.

The herb was historically used for scrofula, a disease of swollen, infected lymph nodes typically caused by tuberculosis. The term “scrofula” comes from the Latin for “breeding sow,” as the swollen glands were thought to resemble a sow’s body. Red clover’s reputation for treating this condition demonstrates its traditional association with lymphatic health.

In traditional European herbalism, red clover was considered one of the most powerful alterative herbs, used for “bad blood” conditions – chronic inflammation, recurrent infections, skin diseases, and glandular swellings. This concept of “bad blood” reflected observations of sluggish lymphatic drainage, poor elimination, and accumulation of metabolic wastes, rather than any actual problem with the blood itself.

Additional Information

Nitrogen Fixation & Ecological Role:
As a legume, red clover forms symbiotic relationships with Rhizobium bacteria in root nodules, which convert atmospheric nitrogen into plant-available forms. This makes red clover an excellent cover crop for improving soil fertility, and it’s commonly planted in crop rotation systems or as green manure. The deep root system also helps prevent soil erosion and improves soil structure.

Seasonal Variation in Isoflavone Content:
Research shows that isoflavone content varies throughout the growing season, with peak levels generally occurring mid-summer. Leaves contain higher isoflavone concentrations than flowers, though flowers are more commonly used due to better flavor and traditional preference. Growing conditions, cultivar, and harvest timing all affect phytochemical content.

Combination Formulas:
Red clover works synergistically with other alterative herbs. Classic combinations include:

• For lymphatic support: Red clover + cleavers + calendula
• For skin conditions: Red clover + burdock + dandelion + nettles
• For menopause: Red clover + black cohosh + chaste tree
• For dry coughs: Red clover + marshmallow + licorice + violet

Nutritive Infusions:
Herbalist Susun Weed popularised the use of overnight “nourishing infusions” of red clover (1 ounce herb to 1 quart water, steeped 4-8 hours) as a mineral-rich tonic beverage. This preparation extracts maximum nutritional content and is particularly valued for women’s health, building vitality, and supporting healthy bones and tissues.

Culinary Uses:
Fresh red clover flowers are edible and can be added raw to salads, providing a sweet, mild flavor and nutritional boost. They can also be battered and fried as fritters, infused into vinegars, or made into jellies and wines. The flowers are an attractive, colorful garnish for dishes.

Foraging Considerations:
When wild-harvesting red clover, choose areas away from roadsides and agricultural fields that may be contaminated with exhaust fumes or pesticides. Red clover is abundant and easily cultivated, making it accessible for home garden growing. Harvest the flower heads when fully open and vibrantly colored for best medicinal quality.

Not a Substitute for Medical Treatment:
While red clover has an excellent safety profile and extensive traditional use, serious conditions like cancer, osteoporosis, and cardiovascular disease require proper medical diagnosis and treatment. Red clover can be used as complementary support alongside conventional treatment (with healthcare provider approval) but should not replace necessary medical care.

Sources

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Kanadys, W., Barańska, A., Błaszczuk, A., Polz-Dacewicz, M., Drop, K., Kanecki, K., & Malm, M. (2021). Evaluation of clinical meaningfulness of red clover (Trifolium pratense L.) extract to relieve hot flushes and menopausal symptoms in peri- and post-menopausal women: A systematic review and meta-analysis of randomized controlled trials. Nutrients, 13(4), 1258. https://doi.org/10.3390/nu13041258

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