The Public Herbarium

Close up of dwarf nettle (urtica urens) leaves

Systems Biology, Preventive Health, and Holistic Phytotherapy

Preventive approach (build health before illness), accessible daily practices, holistic body-systems support, sustainable long-term wellness, free/low-cost herbs in NZ, using western systems biology, preventive medicine, phytochemical mechanisms for general wellness. This guide addresses general wellness herbalism from a Western scientific perspective, examining nutritive phytochemistry, systems biology, and preventive health strategies.

Table of Contents

  1. Foundational Wellness Physiology
  2. Nettle: Nutritive Biochemistry
  3. Oatstraw: Nervous System Restoration
  4. Tulsi: Adaptogenic Mechanisms
  5. Bioavailability and Extraction Science
  6. Clinical Applications
  7. Integration Strategies

Foundational Wellness Physiology

What Makes Wellness Herbalism Different

Pharmacological vs. Nutritive Herbalism:

Traditional pharmaceutical medicine operates on the principle of high-dose, targeted intervention — using concentrated compounds to produce specific, measurable effects. Wellness herbalism functions fundamentally differently, working through:

  1. Nutritive support: Providing bioavailable micronutrients that serve as cofactors in thousands of enzymatic reactions
  2. Gentle modulation: Supporting homeostatic mechanisms rather than forcing physiological changes
  3. Multi-system effects: Acting on multiple body systems simultaneously through diverse phytochemical profiles
  4. Cumulative benefits: Building effects over weeks to months rather than producing immediate dramatic changes

The Cumulative Effect Principle:

Research demonstrates that mineral-rich foods like nettle can supply 90-100% of vitamin A requirements and serve as excellent sources of dietary calcium, iron, and protein. However, these benefits accrue through consistent daily intake, not occasional use.

Why consistency matters:

Micronutrient Function in Health

Essential Minerals in Wellness:

Iron:

Calcium:

Magnesium:

Silica:

B Vitamins:

B vitamins function as coenzymes in cellular metabolism, particularly energy production and neurotransmitter synthesis:

Why plant-based sources are valuable:

Nettle: Nutritive Biochemistry

close up of nettle (Urtica diotica) leaves
Nettle (Urtica diotica)

Comprehensive Nutritional Profile

Macronutrient Composition:

Nettle powder contains approximately 38% protein, 9% crude fibre, 16.2% total ash, 0.17% calcium, 0.23% iron, and relatively low carbohydrate content at 37%. This exceptional nutritional density explains nettle’s classification as a functional food.

Protein Quality:

Protein accounts for about 30% of dry mass and contains numerous amino acids necessary for humans. The amino acid profile includes:

Why protein matters in wellness:

Mineral Content in Detail:

Minerals account for approximately 20% of dry mass. Zinc, iron, cobalt, potassium, nickel, and molybdenum are all abundant.

Specific mineral concentrations:

Vitamin Profile:

Chlorophyll Content:

Nettle’s deep green colour indicates high chlorophyll concentration. Chlorophyll has been traditionally considered “blood-building” and while not converted to hemoglobin, it provides:

Bioactive Phytochemicals

Beyond basic nutrients, nettle contains bioactive compounds that contribute to its medicinal effects:

Polyphenolic Compounds:

The phenolic chemicals 3-caffeoylquinic acid (3-CQA), caffeoylmalic acid (CMA), and rutin are abundant in nettle leaves.

Bioavailability consideration: Studies show that the bioavailability of native forms of 3-CQA, CMA, and rutin is low in duodenal transepithelial transfer, but gut bacteria ferment these phenolic chemicals in the colon, suggesting benefits throughout the digestive tract.

Additional Bioactive Compounds:

Mechanisms of Action

Iron Bioavailability:

Plant-based (non-heme) iron is generally less bioavailable than heme iron from animal sources. However, nettle optimises absorption through:

  1. High vitamin C content: Vitamin C converts ferric iron (Fe³⁺) to ferrous (Fe²⁺) iron
  2. Organic acid content: Citric and malic acids enhance iron solubility
  3. Absence of major inhibitors: Unlike some plants, nettle is relatively low in phytates and oxalates that bind minerals

Result: While not as bioavailable as heme iron, nettle provides excellent plant-based iron support, particularly valuable for vegetarians/vegans and menstruating women.

Anti-Inflammatory Mechanisms:

Nettle demonstrates anti-inflammatory effects through multiple pathways:

  1. COX-2 inhibition: Phenolic compounds inhibit cyclooxygenase-2, reducing prostaglandin synthesis
  2. Cytokine modulation: Reduces pro-inflammatory cytokines (IL-1β, IL-6, TNF-α)
  3. NF-κB pathway suppression: Inhibits nuclear factor kappa B, a master regulator of inflammation
  4. Histamine modulation: Despite containing histamine, nettle inhibits histamine release from mast cells (antihistamine effect)

Clinical relevance: These mechanisms explain nettle’s traditional use for arthritis, allergies, and inflammatory conditions.

Diuretic Action:

Nettle acts as a gentle diuretic through:

Safety advantage: Unlike pharmaceutical diuretics, nettle provides potassium while promoting fluid excretion, preventing potassium depletion.

Antihistamine Effects:

Nettle’s antihistamine properties involve:

  1. Mast cell stabilisation: Prevents degranulation and histamine release
  2. Histamine receptor antagonism: May block H1 receptors
  3. Anti-inflammatory effects: Reduces overall allergic cascade

Clinical applications: Allergic rhinitis, seasonal allergies, urticaria (hives)

Clinical Evidence

Nutritional Studies:

Studies demonstrate that processed nettle can supply 90-100% of vitamin A and serves as a good source of dietary calcium, iron, and protein. Researchers recommend nettle as a high-protein, low-calorie source of essential nutrients, particularly in vegetarian, diabetic, or other specialised diets.

Processing considerations: Research shows that nettle retains a significant portion of minerals, vitamins, and essential nutrients after pre-treatment by blanching or cooking prior to frozen storage, confirming that cooked nettle maintains nutritional value.

Arthritis and Inflammation:

Multiple studies have investigated nettle for arthritis:

Allergic Rhinitis:

Clinical trials show nettle reduces symptoms of hay fever and allergic rhinitis, likely through antihistamine and anti-inflammatory mechanisms.

Benign Prostatic Hyperplasia (BPH):

Nettle root (different from leaf used for nutrition) shows benefits for BPH through:

Oatstraw: Nervous System Restoration

oats (Avena sativa) leaves and seed head close up
Oats (Avena sativa)

Nutritive Nervine Mechanisms

What “Trophorestorative” Means:

Oats are considered one of the most deeply nourishing nervines, especially for people who feel worn down by life’s demands. “Trophorestorative” literally means “nourishment that restores — “these herbs rebuild depleted tissues through nutritional support rather than pharmacological stimulation or sedation.

Distinct from other nervines:

Constituent Analysis

Mineral Profile:

Green milky oats are packed with B vitamins, calcium, magnesium, silica, and other key nutrients that support healthy nerve function and calm stress at its root.

Silica Content:

Oat straw is rich in silica, which is found in the nervous system. The brain and nerves need silica.

Why silica matters for nervous system:

  1. Myelin sheath integrity: Silica contributes to the structure of myelin (fatty insulation around nerve fibres)
  2. Nerve signal transmission: Proper myelination allows rapid, efficient nerve conduction
  3. Connective tissue support: Nerves are surrounded by connective tissue structures requiring silica
  4. Neurotransmitter synthesis: May support enzymatic processes involved in neurotransmitter production

Calcium and Magnesium:

Calcium and magnesium are vital for nervous system regulation, muscle relaxation, and emotional steadiness.

Calcium’s nervous system roles:

Magnesium’s nervous system roles:

B Vitamins:

B vitamins help support mood, energy metabolism, and nervous system repair.

Specific B vitamin mechanisms:

B1 (Thiamine):

B3 (Niacin/NAD+):

B5 (Pantothenic acid):

B6 (Pyridoxine):

Bioactive Alkaloids and Saponins:

Alkaloids and polysaccharides are believed to support nerve sheath regeneration and nervous system healing.

Avenin (alkaloid):

Triterpenoid saponins:

Avenanthramides:

Unique polyphenolic compounds found almost exclusively in oats:

Mechanisms:

  1. Nitric oxide (NO) enhancement: Avenanthramides increase NO production in vascular smooth muscle
  2. Vasodilation: Increased NO → endothelial → relaxed blood vessels → vascular → improved blood flow
  3. Cerebral blood flow: Better circulation to brain enhances oxygen and nutrient delivery
  4. Anti-inflammatory: Suppresses inflammatory cytokines (IL-6, TNF-α)
  5. Antioxidant: Protects against oxidative stress

Clinical relevance: A study with 37 healthy older adults in a 24-week trial showed that cerebral vascular responsiveness increased by 42% with 1500mg daily oat straw extract, indicating the middle cerebral artery was able to dilate in response to stress, increasing oxygen and nutrient delivery to brain cells.

Mechanisms of Nervous System Support

Nourishing Depleted Systems:

Avena “feeds” the nervous system especially when under stress. It is specific in cases of nervous debility and exhaustion, especially when associated with depression.

How nourishment restores function:

  1. Replenishing cofactor deficiencies: Chronic stress depletes B vitamins, magnesium, and other nutrients required for neurotransmitter synthesis
  2. Supporting energy metabolism: Neurons are metabolically active; B vitamins and minerals ensure adequate ATP production
  3. Rebuilding myelin: Silica and B vitamins support myelin sheath integrity for proper nerve conduction
  4. Reducing oxidative stress: Antioxidants (avenanthramides, vitamin E) protect neurons from damage
  5. Restoring HPA axis function: Oatstraw supports the body’s healthy response to stress and the optimal function of both the endocrine (hormonal) and nervous system

Vasodilatory Effects:

Oat straw is a vasodilator, improving blood flow throughout the body including the brain.

Mechanism:

Clinical outcome: Improved mental clarity, focus, and cognitive function, particularly under stress.

Phosphodiesterase Inhibition:

Oat straw extract inhibits phosphodiesterase type 4 (PDE4).

Why this matters:

PDE4 breaks down cyclic AMP (cAMP), a second messenger involved in:

PDE4 inhibition → Increased cAMP → Enhanced cognitive function and mood

(Note: Pharmaceutical PDE4 inhibitors are being investigated for depression and cognitive enhancement; oat straw provides gentle, natural PDE4 inhibition)

Alpha Brain Wave Enhancement:

Oat straw increases alpha brain waves, associated with relaxed alertness, super-learning, flow states, and joy.

Brain wave states:

Alpha state benefits:

Adaptogenic Properties:

Triterpenoid saponins may offer gentle adaptogenic effects over time.

Unlike stronger adaptogens (ashwagandha, rhodiola), oatstraw works gradually through:

  1. HPA axis nourishment: Provides nutrients (B5, vitamin C, magnesium) required for cortisol synthesis and regulation
  2. Adrenal support: Supports healthy adrenal gland function during stress
  3. Gradual restoration: Rebuilds resilience over weeks to months rather than immediate effects

Clinical Applications Based on Mechanisms

Nervous Exhaustion and Burnout:

Oat straw is specific in cases of nervous debility and exhaustion, especially when associated with depression.

Who benefits most:

Timeline: Benefits typically manifest after 2-3 weeks of daily use, with full effects after 2-3 months.

Addiction Recovery:

Milky oats, especially when paired with skullcap, are excellent for addiction withdrawal symptoms, given as tincture in large doses.

Mechanisms supporting recovery:

Sexual Dysfunction from Nervous Exhaustion:

Milky oats work on the nervous and endocrine systems, helping with sexual weakness — one is so burnt out that there is not only lack of energy and desire, but even hypersensitivity to being touched due to frazzled nerves.

Mechanism:

Bone Health (Osteoporosis Prevention):

Research indicates oat straw as a preventative measure against osteoporosis due to rich content of bone-strengthening minerals, especially calcium in organic, easily assimilated form.

Mechanisms:

Particularly valuable for:

Tulsi: Adaptogenic Mechanisms

Tulsi (Ocimum tenuiflorum) tulsi plant
Tulsi (Ocimum tenuiflorum)

HPA Axis Modulation

Understanding the HPA Axis:

The hypothalamic-pituitary-adrenal (HPA) axis is the body’s central stress response system:

  1. Hypothalamus (brain): Perceives stress → releases CRH (corticotropin-releasing hormone)
  2. Pituitary gland (brain): CRH stimulates → releases ACTH (adrenocorticotropic hormone)
  3. Adrenal glands (above kidneys): ACTH stimulates → releases cortisol

Negative feedback loop: Cortisol signals back to hypothalamus and pituitary to reduce CRH and ACTH (should turn system off once stress passes)

HPA Axis Dysregulation:

Chronic stress causes:

Consequences:

Tulsi’s Mechanisms at HPA Axis

Direct HPA Modulation:

Tulsi’s constituents, including ocimumosides and ocimarin, inhibit corticosterone release, protect against adrenal hypertrophy, act as corticotropin-releasing hormone receptor 1 (CRHR1) antagonists, and inhibit 11β-hydroxysteroid dehydrogenase (11β-HSD1) and catechol-O-methyltransferase (COMT) activity.

Breaking this down:

1. CRH Receptor Antagonism:

2. 11β-HSD1 Inhibition:

3. COMT Inhibition:

4. Adrenal Protection:

Clinical Evidence for Stress Reduction

Randomised Controlled Trial (RCT):

In a six-week randomised, double-blind, placebo-controlled study, holy basil significantly improved general stress scores, with a 39% reduction in stress-related issues such as sleep problems and exhaustion, compared to placebo.

Acute Stress Response:

Results from the Maastricht Acute Stress Test (MAST) indicated that tulsi buffered physiological and subjective responses to acute stress as evidenced by significantly lower concentrations in salivary cortisol, salivary amylase, blood pressure, and subjective stress ratings compared to people taking placebo.

The MAST procedure:

Tulsi’s effects:

Long-Term Cortisol Regulation:

Hair cortisol concentrations were significantly lower in participants taking tulsi for 8 weeks compared to placebo, suggesting tulsi can dampen HPA-axis activity in the long-term.

Why hair cortisol matters:

Result: Tulsi reduces not just acute stress responses but also overall cortisol burden over time.

Neurotransmitter Modulation

GABAergic Effects:

Tulsi influences GABA (gamma-aminobutyric acid), the brain’s primary calming neurotransmitter:

Mechanisms:

Clinical relevance: Reduces anxiety while maintaining alertness and cognitive function.

Serotonergic Modulation:

Tulsi influences serotonin pathways:

Effects:

Serotonin functions:

Dopaminergic Influence:

Through COMT inhibition and direct effects:

Results:

Dopamine functions:

Cholinergic Effects:

Potential mild acetylcholinesterase inhibition:

Outcomes:

Anti-Inflammatory and Immunomodulatory Effects

Anti-Inflammatory Mechanisms:

Tulsi’s constituent profile creates multi-pathway anti-inflammatory effects:

Eugenol:

Rosmarinic acid:

Ursolic acid:

Why reducing inflammation supports wellness:

Chronic low-grade inflammation (“inflammaging”) contributes to:

Immunomodulatory Effects:

Tulsi demonstrates bidirectional immune modulation:

Enhances immune function when deficient:

Reduces overactive immune responses:

Clinical applications:

Constituent-Specific Actions

Ocimumosides A and B:

These compounds have been identified as anti-stress compounds and may lower blood corticosterone and create positive alterations in the neurotransmitter system of the brain.

Unique to tulsi:

Beta-Caryophyllene:

Sesquiterpene found in tulsi essential oil:

Mechanisms:

Clinical relevance: Contributes to tulsi’s pain-relieving and anti-inflammatory effects.

Respiratory and Antimicrobial Effects

Respiratory Support:

Traditional use for coughs, colds, and respiratory infections supported by:

Antimicrobial activity:

Expectorant effects:

Anti-asthmatic:

Metabolic and Cardiovascular Support

Blood Sugar Regulation:

Tulsi demonstrates blood glucose-lowering effects:

Mechanisms:

Clinical applications:

Cardiovascular Protection:

Cardioprotective effects through:

Anti-inflammatory: Reduces vascular inflammation
Antioxidant: Protects against oxidative damage to blood vessels
Blood pressure: Mild hypotensive effects
Lipid modulation: May improve cholesterol profiles
Anti-platelet: Reduces excessive clotting risk

Bioavailability and Extraction Science

Understanding Extraction Methods

Why Extraction Method Matters:

Plant constituents vary in solubility:

Different preparations extract different compounds:

Infusion (Hot Water Steep)

Standard herbal tea method:

Process:

  1. Pour boiling water over herbs
  2. Cover (prevent essential oil evaporation)
  3. Steep 10-15 minutes
  4. Strain

Extracts primarily:

Best for:

Limitations:

Long/Cold Infusion (Nourishing Infusion)

Extended steep method for maximum mineral extraction:

Process:

  1. Use larger quantity of herb (1/4 cup to 1 litre water)
  2. Add cold or boiling water
  3. Cover tightly
  4. Steep 4-8 hours or overnight
  5. Strain
  6. Refrigerate, use within 36 hours

Extracts:

Why it works better for minerals:

Extended contact time allows:

Best for:

Scientific basis: Research on nettle processing shows that extended contact time enhances mineral extraction while maintaining nutritional value.

Decoction (Simmering)

Extended heat extraction for tough plant parts:

Process:

  1. Add herbs to cold water
  2. Bring to boil
  3. Reduce heat, simmer 15-30 minutes
  4. Strain

Extracts:

Best for:

Not recommended for:

Tincture (Alcohol Extraction)

Concentrated alcohol-based extract:

Process:

  1. Herbs in jar
  2. Cover with alcohol (typically 40-60% ethanol/vodka)
  3. Steep 2-6 weeks, shaking regularly
  4. Strain, bottle

Extracts:

Advantages:

Best for:

Considerations:

Glycerite (Glycerin Extraction)

Alcohol-free alternative:

Similar to tincture but using vegetable glycerin instead of alcohol:

Advantages:

Disadvantages:

Optimising Extraction for Specific Herbs

Nettle (Nutritive use):

close up of nettle (Urtica diotica) leaves
Nettle (Urtica diotica)

Oatstraw:

oats (Avena sativa) leaves and seed head close up
Oats (Avena sativa)

Tulsi:

Tulsi (Ocimum tenuiflorum) tulsi plant
Tulsi (Ocimum tenuiflorum)

Ginger:

Ginger (Zingiber officinale) root
Ginger (Zingiber officinale)

Lemon Balm:

Lemon Balm (Melissa officinalis) leaves
Lemon Balm (Melissa officinalis)

Combination Strategies

Nourishing Infusion Base + Daily Tea:

Morning routine:

  1. Drink 1-2 cups nourishing infusion (nettle-oatstraw, prepared previous night)
  2. Have tulsi or ginger tea in afternoon (fresh preparation)

Rationale:

Tincture + Tea Combination:

For stress support:

  1. Daily tulsi tea (2-3 cups)
  2. Ashwagandha tincture (morning and evening)

Rationale:

Clinical Applications

Building a Personalised Wellness Practice

Assessment Framework:

Before choosing herbs, consider:

1. Current State:

2. Primary Goals:

3. Resources:

Protocol Examples

Foundation Protocol (Everyone):

Daily:

  1. Nourishing infusion: Nettle-oatstraw blend, 1-2 cups

Benefits:

Timeline: Cumulative benefits over weeks to months

Stress Resilience Protocol:

Daily:

  1. Nourishing infusion: Nettle-oatstraw (1-2 cups) – foundation minerals
  2. Tulsi tea: 2-3 cups throughout day – adaptogenic support
  3. Lemon balm tea: Evening – calm nervous system

Optional additions:

Timeline:

Clinical markers to track:

Burnout Recovery Protocol:

Daily:

  1. Oatstraw infusion: 2-3 cups (nervous system restoration)
  2. Tulsi: 2-3 cups (adaptogenic, HPA support)
  3. Ashwagandha: 300-600mg standardised extract or tincture equivalent

Weekly:

Lifestyle integration:

Timeline:

Important: Burnout requires addressing root causes (work load, boundaries, lifestyle) alongside herbs.

Immune Support Protocol (Preventive):

Daily (September-May in NZ):

  1. Nettle infusion: 1-2 cups (nutritive, anti-inflammatory)
  2. Tulsi tea: 1-2 cups (immunomodulatory, antimicrobial)
  3. Garlic: Fresh in food daily
  4. Ginger: Fresh or powdered in tea/food

Weekly:

At first sign of illness:

Menopausal Support Protocol:

Daily:

  1. Nourishing infusion: Nettle-oatstraw-red raspberry leaf (mineral support, bone health)
  2. Tulsi: 2 cups (stress, mood, adaptogenic)
  3. Sage tea: 1 cup if hot flashes/night sweats (drying, reduces sweating)

Optional:

Lifestyle:

Integration Strategies

Timing and Routine

Morning Ritual (Upon Waking):

Mid-Morning:

Afternoon (2-4pm):

Evening:

Before Bed:

Seasonal Adjustments

Spring (September-November NZ):

Summer (December-February):

Autumn (March-May):

Winter (June-August):

Cycling and Sustainability

Adaptogen Cycling:

Some practitioners recommend periodic breaks from adaptogens to prevent tolerance:

Approach 1: Continuous use (most traditional)

Approach 2: Cycling (some modern herbalists prefer)

Recommendation: For gentle adaptogens like tulsi and oatstraw, continuous use is generally safe and traditional. Listen to your body.

Nourishing Herbs:

Nettle, oatstraw, red raspberry leaf are foods and can be consumed continuously without breaks.

Cost-Effectiveness and Accessibility

Budget Prioritisation:

If budget limited, prioritise:

  1. Nettle (most essential, highly nutritive, good value)
  2. Oatstraw (nervous system support, also good value)
  3. One adaptogen (tulsi or ashwagandha based on needs)
  4. Fresh ginger (from supermarket, inexpensive, versatile)

Growing Your Own:

Easy herbs to grow in NZ:

Wild Foraging:

Always:

Summary: Scientific Foundations of Wellness

Key Principles:

  1. Consistency creates cumulative benefits: Wellness herbs work through sustained nutritional support, not acute pharmacological effects
  2. Multi-system support: Rather than targeting single pathways, nourishing herbs provide broad-spectrum support through diverse nutrient and phytochemical profiles
  3. Foundation before intervention: Building nutritional reserves and supporting homeostatic mechanisms prevents disease more effectively than treating established illness
  4. Individual variability: Responses vary based on current nutritional status, stress levels, genetics, and lifestyle factors
  5. Integration with lifestyle: Herbs amplify effects of good sleep, nutrition, movement, and stress management — they don’t replace these foundations

Mechanism Summary:

Nettle:

close up of nettle (Urtica diotica) leaves
Nettle (Urtica diotica)

Oatstraw:

oats (Avena sativa) leaves and seed head close up
Oats (Avena sativa)

Tulsi:

Tulsi (Ocimum tenuiflorum) tulsi plant
Tulsi (Ocimum tenuiflorum)

Start with foundations:

  1. Daily nourishing infusion (nettle-oatstraw)
  2. Add specific support based on needs (tulsi for stress, etc.)
  3. Adjust seasonally
  4. Combine with healthy lifestyle
  5. Track subjective improvements
  6. Be patient — benefits are cumulative

When to Seek Professional Support:

Herbal wellness support is preventive and supportive, not curative medicine. Seek professional help for:

  • Diagnosed medical conditions requiring treatment
  • Symptoms that worsen or don’t improve
  • New or concerning symptoms
  • Mental health crises
  • Integration with medications (check interactions)
  • Pregnancy/breastfeeding (though many wellness herbs are safe, always verify)

References

Belkheir, A., De, S., & Singh, R. (2013). Avena sativa (Oat), a potential nutraceutical and therapeutic agent: an overview. Critical Reviews in Food Science and Nutrition, 54(10), 1262-1275.

Bhusal, K.K., et al. (2022). Nutritional and pharmacological importance of stinging nettle (Urtica dioica L.): A review. Heliyon, 8(6), e09717.

Bone, K., & Mills, S. (2013). Principles and practice of phytotherapy: Modern herbal medicine (2nd ed.). Churchill Livingstone.

Bonetti, G., et al. (2016). Bioavailability of phenolic compounds from Urtica dioica extract. Journal of Pharmaceutical and Biomedical Analysis, 128, 546-553.

Cohen, M.M. (2014). Tulsi – Ocimum sanctum: A herb for all reasons. Journal of Ayurveda and Integrative Medicine, 5(4), 251-259.

Jamshidi, N., & Cohen, M.M. (2017). The clinical efficacy and safety of Tulsi in humans: A systematic review of the literature. Evidence-Based Complementary and Alternative Medicine, 2017, 9217567.

Lopresti, A.L., et al. (2022). A randomized, double-blind, placebo-controlled trial investigating the effects of an Ocimum tenuiflorum (Holy Basil) extract on stress, mood, and sleep in adults experiencing stress. Frontiers in Nutrition, 9, 965130.

Mihaljev, Ž, et al. (2014). Comparison of the Mineral Composition of Stinging Nettle (Urtica dioica L.) From Organic and Conventional Production. Journal of Agricultural Sciences, 59(3), 261-267.

Nie, L., et al. (2006). Avenanthramide, a polyphenol from oats, inhibits vascular smooth muscle cell proliferation and enhances nitric oxide production. Atherosclerosis, 186(2), 260-266.

Rutto, L.K., et al. (2013). Mineral Properties and Dietary Value of Raw and Processed Stinging Nettle (Urtica dioica L.). International Journal of Food Science, 2013, 857120.

Said, O., et al. (2015). Highlights on nutritional and therapeutic value of stinging nettle (Urtica dioica). International Journal of Pharmacy and Pharmaceutical Sciences, 7(10), 8-14.

Saxena, R.C., et al. (2012). Efficacy of an Extract of Ocimum tenuiflorum (OciBest) in the Management of General Stress: A Double-Blind, Placebo-Controlled Study. Evidence-Based Complementary and Alternative Medicine, 2012, 894509.

Upton, R. (2013). Stinging nettles leaf (Urtica dioica L.): Extraordinary vegetable medicine. Journal of Herbal Medicine, 3(1), 9-38.

Rongoā Māori Disclaimer: This guide does not represent rongoā Māori preparation methods or traditional Māori medicine-making. Rongoā Māori is a complete healing system with its own protocols, karakia (prayers), and cultural practices that cannot be separated from te ao Māori (the Māori worldview). For rongoā Māori knowledge and treatment, please consult qualified rongoā practitioners through Te Paepae Motuhake or other appropriate Māori health services.

Medical Disclaimer: This guide is for educational purposes only and is not medical advice. Herbal preparations can interact with medications, cause allergic reactions, and may be contraindicated in certain health conditions. Always consult qualified healthcare practitioners before using herbal medicines, especially if you are pregnant, nursing, taking medications, or have medical conditions. You are solely responsible for correct plant identification, safe preparation practices, and appropriate use. The information presented represents current scientific understanding, which continues to evolve.

Note on Pricing: All prices mentioned in this guide are approximate and based on New Zealand suppliers as of January 2026. Prices vary by supplier, season, and market conditions. We recommend checking current prices with your local suppliers.

The Public Herbarium is built on a foundation of scientific integrity, transparency, and care. Research sources are referenced throughout the site wherever possible. Content creation is assisted by AI tools and carefully reviewed for accuracy.