Hermetica Superfood Encyclopedia
The Short Answer
Wood sorrel (Oxalis species) contains high concentrations of oxalic acid (102 mg/g dry weight) and polyphenols that demonstrate significant antioxidant activity by reducing reactive oxygen species production in airway epithelial cells. The plant's polyphenol-rich extracts enhance catalase activity (p<0.001) and outperform vitamin C in protecting cells against oxidative stress at 1-2.5% concentrations.
CategoryLeaf & Herb
GroupLeaf/Green
Evidence LevelModerate
Primary KeywordWood Sorrel benefits
Synergy Pairings4
Wood Sorrel — botanical close-up
Health Benefits
Exhibits potent antioxidant activity due to high levels of vitamin C and flavonoids, protecting cellular integrity.
Supports digestive health by stimulating saliva and digestive enzyme production through its sour-tasting oxalic compounds.
Promotes immune function via its rich content of vitamin C and other phytonutrients.
May offer anti-inflammatory effects from its phenolic compounds, reducing systemic inflammation.
Traditionally used to reduce fever, alleviate stomach cramps, and mitigate nausea.
Origin & History
Natural habitat
Wood Sorrel (Oxalis acetosella) is a delicate perennial herb native to temperate regions across North America, Europe, and Asia. Thriving in woodlands and shaded areas, it is characterized by its clover-like leaves and tart, lemony flavor. This plant has been historically valued for both its culinary and medicinal applications.
“Wood Sorrel has been a cherished plant in folk traditions across Europe, North America, and Asia for centuries. It was historically used as a natural remedy for stomach ailments, scurvy, and fevers, valued for its crisp tartness and gentle potency. Its legacy continues as a favored leaf for both nourishment and relief.”Traditional Medicine
Scientific Research
Scientific studies support the antioxidant, digestive, and anti-inflammatory properties of Wood Sorrel, attributed to its rich content of vitamin C and phenolic compounds. This aligns with traditional uses and provides a foundation for understanding its physiological effects.
Preparation & Dosage
Traditional preparation
Culinary Use
Incorporate fresh leaves into salads, soups, or as a tangy seasoning.
Herbal Tea
Steep 1–2 teaspoons of dried leaves in hot water for 5–7 minutes to soothe stomach upset or boost immunity.
Dosage
Consume regularly as part of the diet for antioxidant and digestive support.
Important Note
Moderation is advised due to its natural oxalate content.
Nutritional Profile
- Dietary Fiber: Supports digestion and promotes gut health.
- Vitamin C: Provides immune support, antioxidant protection, and aids collagen synthesis.
- Vitamin A: Contributes to vision, immune function, and skin health.
- Calcium: Supports bone structure and neuromuscular function.
- Phosphorus: Essential for bone health and energy metabolism.
- Iron: Aids oxygen transport and red blood cell formation.
- Flavonoids and Phenolic Compounds: Offer significant anti-inflammatory and antioxidant benefits.
How It Works
Mechanism of Action
Wood sorrel's polyphenols reduce reactive oxygen species (ROS) production in airway epithelial cells while significantly enhancing catalase activity to convert hydrogen peroxide to water and oxygen. The plant's high vitamin E, lutein, and zeaxanthin content work synergistically with triterpenoid saponins like kudinoside D to neutralize free radicals and protect cellular membranes from oxidative damage.
Clinical Evidence
Evidence stems primarily from in vitro studies rather than human clinical trials. Laboratory research on normal human bronchial epithelial cells demonstrated that 1-2.5% wood sorrel extract prevented ROS generation from diesel exhaust exposure, with 1% concentrations significantly increasing catalase activity (p<0.001, n=3). Animal studies in 120 broiler chickens showed that 10g/kg dietary wood sorrel powder improved meat's total phenolic content and antioxidant capacity. Large-scale human clinical trials with quantified health outcomes remain lacking, limiting clinical applications.
Safety & Interactions
Wood sorrel poses significant safety concerns due to high oxalic acid content (102 mg/g dry weight), which can cause kidney stones or oxalate poisoning with excessive consumption. Patients with existing kidney disorders should avoid wood sorrel due to oxalate accumulation risks. Historical remedies suggest calcium carbonate may counteract oxalic acid toxicity, though this requires medical supervision. No specific drug interactions are documented, but the oxalic acid content warrants caution in patients taking medications affecting kidney function or calcium metabolism.
Synergy Stack
Hermetica Formulation Heuristic
Mineral cofactor
Immune & Inflammation | Gut & Microbiome
Also Known As
Oxalis acetosellaOxalis corniculatacreeping wood sorrelsoursobsourgrasscreeping woodsorrel
Frequently Asked Questions
What is the active compound responsible for wood sorrel's antioxidant effects?
Wood sorrel's antioxidant activity comes from multiple compounds including polyphenols, vitamin E, lutein, and zeaxanthin. The polyphenol-rich extracts demonstrate superior antioxidant capacity compared to vitamin C, reducing cellular oxidative stress at concentrations of 1-2.5%.
How much oxalic acid does wood sorrel contain?
Wood sorrel contains approximately 102 mg of oxalic acid per gram of dry weight, or about 22.42 mg per gram of fresh plant material. This high oxalic acid concentration contributes to the plant's characteristic sour taste but also presents safety concerns with excessive consumption.
Can wood sorrel help with respiratory health?
Laboratory studies suggest wood sorrel may support respiratory health by protecting airway epithelial cells from oxidative damage. Research on human bronchial cells showed that wood sorrel extracts prevented harmful reactive oxygen species generation from diesel exhaust exposure, though human clinical trials are needed.
Is wood sorrel safe to consume regularly?
Regular consumption of wood sorrel should be limited due to its high oxalic acid content, which can contribute to kidney stone formation or oxalate poisoning. Individuals with kidney disorders should avoid wood sorrel entirely, and all users should consume only small amounts occasionally rather than as a regular dietary supplement.
What's the difference between wood sorrel species?
Common wood sorrel species include Oxalis acetosella (native to temperate woodlands) and Oxalis corniculata (creeping wood sorrel). While both contain similar bioactive compounds like oxalic acid and polyphenols, concentrations may vary slightly between species, with all maintaining the characteristic sour taste and antioxidant properties.
Can I consume wood sorrel if I have kidney issues or a history of kidney stones?
Wood sorrel contains significant oxalic acid, which can contribute to kidney stone formation in susceptible individuals. People with kidney disease, a history of kidney stones, or those taking medications that affect kidney function should consult a healthcare provider before consuming wood sorrel regularly. Those with these conditions may need to limit intake or avoid the ingredient altogether.
What is the optimal daily dosage of wood sorrel for immune and antioxidant benefits?
There is no universally established recommended daily dosage for wood sorrel, as clinical studies on humans remain limited. Typical herbal use suggests 1–3 grams of dried leaf per day, either as a tea or supplement, though some sources recommend up to 6 grams divided into doses. Starting with lower amounts and consulting a healthcare practitioner ensures safety and allows for individual tolerance assessment.
Does wood sorrel interact with medications for blood thinning or iron absorption?
Wood sorrel's high vitamin C content may enhance iron absorption, which could be problematic for those with iron overload conditions or taking iron-restricting medications. Its oxalic acid can also bind to minerals like calcium and iron, potentially reducing their bioavailability if consumed in large quantities. Individuals taking anticoagulants or those with iron metabolism disorders should discuss wood sorrel use with their healthcare provider.
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