Nasturtium Officinale

The dosage of Nasturtium Officinale varies significantly based on the intended use and the concentration of the product.

• For General Nutritional Support: When used as a dietary supplement, typical dosages range from 500 mg to 1,500 mg of dried leaf powder daily, often divided into two or three doses.
• For Standardized Extracts: If the product is standardized to phenethyl isothiocyanate (PEITC) content, dosages are much lower, typically ranging from 10 mg to 50 mg per day, as directed by a healthcare professional.
• Homeopathic Dosing: Standard homeopathic protocols often involve 3 to 5 pellets of a 6C or 30C potency taken three times daily. However, homeopathic dosing is highly individualized based on the patient's symptom profile.

Nasturtium Officinale is generally considered safe for children when consumed as part of a balanced diet. However, the use of concentrated medicinal extracts or high-potency supplements in the pediatric population is not well-established.

• Ages 4-12: Some practitioners may suggest a reduced dose (typically 1/4 to 1/2 of the adult dose) of mild tinctures, but this must be done under strict medical supervision.
• Ages 0-3: Clinical data is insufficient to recommend the use of Nasturtium Officinale extracts in infants and toddlers.

Always consult a pediatrician before introducing botanical extracts to a child's regimen.

Renal Impairment

Patients with significant renal impairment (Stage 3 CKD or higher) should use Nasturtium Officinale with caution. The plant is high in oxalates, which can contribute to the formation of calcium oxalate kidney stones. Furthermore, the clearance of its metabolites is primarily renal; therefore, a dose reduction may be necessary to prevent accumulation.

Hepatic Impairment

While Nasturtium Officinale is often used to support liver detoxification, patients with active hepatitis or cirrhosis should be monitored. The induction of Phase II enzymes may alter the metabolism of other medications processed by the liver.

Elderly Patients

Geriatric patients often have reduced renal clearance and are more likely to be on polypharmacy (multiple medications). Dosing should start at the lower end of the therapeutic range to assess tolerance, particularly regarding its potential effects on blood pressure and heart rate (due to its adrenergic agonist properties).

• Consistency: For best results, Nasturtium Officinale supplements should be taken at the same time each day.
• With Food: It is generally recommended to take Nasturtium Officinale with food to minimize the risk of gastrointestinal irritation, which can occur due to the pungent mustard oils (isothiocyanates) present in the plant.
• Swallow Whole: Capsules and tablets should be swallowed whole with a full glass of water. Do not crush or chew standardized release formulations unless specifically instructed.
• Storage: Store Nasturtium Officinale products in a cool, dry place away from direct sunlight. The bioactive isothiocyanates and Vitamin C are sensitive to heat and light and can degrade over time if not stored properly.

If you miss a dose of Nasturtium Officinale, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and resume your regular dosing schedule. Do not double the dose to make up for a missed one, as this increases the risk of gastrointestinal side effects.

Signs of an acute overdose of Nasturtium Officinale extracts may include:

• Severe abdominal pain and cramping
• Nausea and projectile vomiting
• Urinary tract irritation or a burning sensation during urination
• Rapid heart rate (tachycardia) due to adrenergic stimulation

In the event of a suspected overdose, contact your local poison control center or seek emergency medical attention immediately. Treatment is generally supportive, focusing on hydration and gastric protection.

> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance.

The most frequently reported side effects of Nasturtium Officinale are related to the gastrointestinal system, primarily due to the presence of glucosinolates and isothiocyanates, which can be irritating to the mucosal lining.

• Gastrointestinal Upset: This may manifest as bloating, gas, or mild stomach cramps. It typically occurs shortly after ingestion and may subside as the body adjusts to the supplement.
• Abdominal Pungency: Some patients report a "burning" or "spicy" sensation in the stomach or throat, similar to the sensation of eating horseradish or strong mustard.
• Diarrhea: High doses of Vitamin C or concentrated watercress extracts can have an osmotic effect in the bowel, leading to loose stools.

• Urinary Frequency: Nasturtium Officinale has mild diuretic properties, which may lead to an increased need to urinate.
• Cystitis-like Symptoms: In some individuals, the excretion of isothiocyanate metabolites can irritate the bladder lining, causing a sensation of urgency or mild discomfort during urination.
• Dermatological Reactions: Topical contact with the fresh plant or concentrated oils can cause contact dermatitis (skin rash) in sensitive individuals.

• Goitrogenic Effects: Like many members of the cruciferous family, Nasturtium Officinale contains compounds that can interfere with iodine uptake by the thyroid gland. This is generally only a concern with extremely high, chronic intake in individuals with pre-existing iodine deficiency.
• Hypotension or Hypertension: Due to its complex interaction with adrenergic receptors, some individuals may experience unpredictable changes in blood pressure.

While rare, certain side effects require immediate clinical intervention. Stop taking Nasturtium Officinale and call your doctor immediately if you experience:

• Anaphylaxis: Signs include swelling of the face, lips, or tongue; difficulty breathing; wheezing; and a rapid drop in blood pressure. This is a life-threatening allergic reaction.
• Severe Nephrolithiasis (Kidney Stones): Characterized by intense, stabbing pain in the flank or lower back, blood in the urine (hematuria), and nausea. The oxalate content in Nasturtium Officinale can trigger stone formation in susceptible patients.
• Hemolytic Anemia: In individuals with G6PD deficiency, high doses of Vitamin C (found in Nasturtium Officinale) can potentially trigger the breakdown of red blood cells.
• Severe Gastric Ulceration: If you notice black, tarry stools or vomit that looks like coffee grounds, it may indicate internal bleeding exacerbated by the irritating effects of isothiocyanates.

> Warning: Stop taking Nasturtium Officinale and call your doctor immediately if you experience any of these.

With prolonged use of high-dose Nasturtium Officinale extracts, the following may occur:

• Thyroid Suppression: Long-term intake of goitrogens may lead to an enlarged thyroid (goiter) or hypothyroidism.
• Vitamin B12 Interference: Extremely high doses of Vitamin C (as found in some concentrated Nasturtium extracts) can interfere with the absorption and metabolism of Vitamin B12 over time.
• Kidney Stone Recurrence: Chronic high oxalate intake increases the risk of recurrent calcium oxalate stones.

There are currently no FDA Black Box Warnings for Nasturtium Officinale. However, it is regulated differently depending on whether it is sold as a food, a dietary supplement, or a homeopathic drug. Patients should always verify the source and concentration of the product they are using.

Report any unusual symptoms to your healthcare provider. Your doctor may perform periodic blood tests or thyroid function tests if you are using this agent long-term.

Nasturtium Officinale is a potent pharmacological agent and should not be viewed merely as a dietary addition when taken in extract form. It contains bioactive compounds that can significantly influence metabolic pathways and autonomic nervous system functions. Patients with a history of gastrointestinal ulcers, thyroid disorders, or kidney stones must exercise extreme caution. It is also vital to ensure that fresh watercress is sourced from clean, flowing water to avoid contamination with Fasciola hepatica (liver fluke), a parasite that can cause serious hepatic disease.

No FDA black box warnings for Nasturtium Officinale.

Allergic Reactions / Anaphylaxis Risk

As a Standardized Chemical Allergen [EPC], Nasturtium Officinale is known to cause hypersensitivity reactions in certain individuals. Patients with known allergies to other members of the Brassicaceae family (such as mustard, broccoli, or cabbage) are at a higher risk of cross-reactivity. Symptoms of an allergic reaction can range from mild hives to life-threatening anaphylaxis.

Organ-Specific Risks

• Nephrotoxicity: While not directly toxic to the kidneys, the high oxalate content poses a significant risk for patients with a history of renal calculi (kidney stones). Excessive intake can lead to oxalate nephropathy.
• Gastrointestinal Toxicity: The pungent isothiocyanates can exacerbate pre-existing gastritis, peptic ulcer disease, or inflammatory bowel disease (IBD).
• Thyroid Function: Nasturtium Officinale may suppress thyroid hormone production in individuals with borderline iodine levels. Monitoring of TSH and T4 levels may be required for those on long-term therapy.

QT Prolongation

There is currently no clinical evidence suggesting that Nasturtium Officinale causes QT prolongation. However, because it acts as an Adrenergic beta-Agonist [MoA], individuals with pre-existing arrhythmias should use it with caution as it may influence heart rate and rhythm.

Patients taking concentrated Nasturtium Officinale extracts long-term may require the following monitoring:

• Thyroid Panel: To ensure the goitrogenic compounds are not suppressing thyroid function.
• Urinalysis: To check for the presence of oxalate crystals or microscopic hematuria.
• Renal Function Tests: Monitoring of Serum Creatinine and GFR, especially in elderly patients.
• Vitamin B12 Levels: To ensure that high Vitamin C intake is not masking or causing a B12 deficiency.

Nasturtium Officinale is generally not expected to cause sedation or cognitive impairment. However, if an individual experiences a rapid heart rate or jitteriness due to its adrenergic effects, they should refrain from driving or operating heavy machinery until these symptoms resolve.

Alcohol may increase the risk of gastric irritation when taken with Nasturtium Officinale. Furthermore, since Nasturtium Officinale inhibits the CYP2E1 enzyme—which is also involved in alcohol metabolism—the combination may theoretically alter the rate at which alcohol is cleared from the system, though clinical data on this specific interaction is limited.

There is no known withdrawal syndrome associated with Nasturtium Officinale. However, if being used for its Vitamin C content to treat a deficiency, stopping abruptly may lead to a return of deficiency symptoms. It is always best to taper off any concentrated supplement under medical supervision.

> Important: Discuss all your medical conditions with your healthcare provider before starting Nasturtium Officinale.

• Warfarin (Coumadin): Nasturtium Officinale is a rich source of Vitamin K. Vitamin K acts as an antagonist to Warfarin, a blood thinner. Consuming large or inconsistent amounts of Nasturtium Officinale can significantly decrease the efficacy of Warfarin, leading to a decreased International Normalized Ratio (INR) and an increased risk of blood clots. This combination is contraindicated unless the patient's Vitamin K intake is strictly standardized and monitored by a hematologist.

• CYP2E1 Substrates (e.g., Acetaminophen, Chlorzoxazone): Nasturtium Officinale is a potent inhibitor of the CYP2E1 enzyme. This can lead to increased plasma levels of drugs metabolized by this pathway. For example, while it might reduce the formation of toxic metabolites from acetaminophen, it could significantly increase the half-life of other drugs, potentially leading to toxicity.
• Lithium: Due to its mild diuretic properties, Nasturtium Officinale may decrease the excretion of lithium, leading to elevated lithium levels in the blood and increasing the risk of lithium toxicity (tremors, confusion, nausea).

• Antihypertensives: Because Nasturtium Officinale has alpha-Adrenergic Agonist and beta-Adrenergic Agonist properties, it may counteract the effects of blood pressure medications such as beta-blockers or ACE inhibitors.
• Antidiabetic Drugs: Some studies suggest that watercress extracts may lower blood glucose levels. When combined with insulin or oral hypoglycemics (like Metformin), there is a moderate risk of hypoglycemia (low blood sugar).

• High-Iodine Foods: Consuming iodine-rich foods (like seaweed or iodized salt) may help mitigate the goitrogenic effects of Nasturtium Officinale.
• Cruciferous Vegetables: Eating other cruciferous vegetables (broccoli, kale, cauliflower) alongside Nasturtium Officinale extracts can have an additive effect on isothiocyanate levels and thyroid suppression.
• Dairy: High calcium intake from dairy may bind with the oxalates in Nasturtium Officinale in the digestive tract, potentially reducing the risk of kidney stone formation but also reducing the absorption of the plant's minerals.

• St. John’s Wort: May induce enzymes that Nasturtium Officinale inhibits, leading to unpredictable metabolic outcomes.
• Iodine Supplements: May be necessary for patients taking high doses of watercress extracts to protect thyroid health.
• Vitamin K Supplements: Should be avoided to prevent excessive intake when using Nasturtium Officinale.

• Glucose Tests: High levels of Vitamin C (from Nasturtium Officinale) can interfere with certain urine glucose tests, leading to false-negative results.
• Fecal Occult Blood Tests: Excessive Vitamin C intake can interfere with the chemical reactions used in these tests, potentially causing false negatives.
• Creatinine Tests: May be slightly affected if the patient is experiencing the diuretic effects of the extract.

> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking.

Nasturtium Officinale must NEVER be used in the following circumstances:

1. 1Known Hypersensitivity: Any individual with a documented allergy to Nasturtium Officinale or any member of the Brassicaceae (mustard) family should avoid this agent. The mechanism is an IgE-mediated allergic response which can lead to anaphylaxis.
2. 2Severe Gastric or Duodenal Ulcers: The pungent isothiocyanates act as direct mucosal irritants. In the presence of active ulceration, Nasturtium Officinale can cause severe pain, bleeding, and delayed healing of the gastric lining.
3. 3Severe Renal Insufficiency: Due to the high oxalate content and the reliance on renal excretion for its metabolites, patients with end-stage renal disease (ESRD) or severe impairment should avoid concentrated extracts to prevent oxalate-induced damage and systemic toxicity.

Conditions requiring careful risk-benefit analysis include:

• Hypothyroidism or Goiter: Because the plant contains goitrogenic compounds that inhibit iodine uptake, patients with existing thyroid dysfunction may see a worsening of their condition.
• History of Nephrolithiasis: Patients prone to calcium oxalate kidney stones should only use Nasturtium Officinale under strict medical guidance, ensuring high fluid intake and potentially limiting dietary oxalates.
• G6PD Deficiency: High concentrations of Vitamin C in the extract may pose a risk of oxidative stress and hemolysis in these patients.

Patients who are sensitive to the following may also react to Nasturtium Officinale:

• Mustard seeds and oils
• Horseradish
• Radishes
• Broccoli and Brussels sprouts
• Canola (Rapeseed) oil

> Important: Your healthcare provider will evaluate your complete medical history before prescribing or recommending Nasturtium Officinale.

FDA Pregnancy Category: Not Formally Assigned.

In traditional medicine, Nasturtium Officinale has been used as an emmenagogue (a substance that stimulates menstrual flow). While culinary amounts are generally considered safe, medicinal doses or concentrated extracts are not recommended during pregnancy. There is a theoretical risk that the stimulating effects on the uterus could lead to complications or premature labor. Furthermore, the effects of high-dose isothiocyanates on fetal development have not been adequately studied in human clinical trials.

It is not known if the bioactive components of Nasturtium Officinale extracts pass into breast milk in significant quantities. However, the pungent oils (isothiocyanates) can alter the flavor of breast milk, which may lead to infant feeding aversion or colic-like symptoms. Due to the lack of safety data, nursing mothers should avoid medicinal extracts and stick to standard dietary amounts.

Nasturtium Officinale is not FDA-approved for medicinal use in children under the age of 4. In older children, it should only be used under the guidance of a healthcare provider. There are concerns regarding the effect of goitrogenic compounds on the developing thyroid gland in children. Standard dietary consumption of watercress is considered safe and nutritious for children who have started solid foods.

Elderly patients are at a higher risk for adverse effects from Nasturtium Officinale due to:

• Reduced Renal Clearance: Aging naturally declines the GFR, making the accumulation of oxalate and other metabolites more likely.
• Polypharmacy: Increased risk of interactions with blood thinners (Warfarin) and blood pressure medications.
• Gastrointestinal Sensitivity: Older adults may have thinner gastric mucosa, making the irritating effects of watercress more pronounced.

For patients with a GFR below 60 mL/min/1.73m², the use of Nasturtium Officinale extracts should be limited. High oxalate levels in these patients can lead to the deposition of crystals in the renal tubules, further declining kidney function. Dialysis does not efficiently clear all botanical metabolites; therefore, ESRD patients should avoid these supplements.

In patients with mild to moderate hepatic impairment (Child-Pugh Class A or B), Nasturtium Officinale may be used with caution. However, its role as a CYP2E1 inhibitor means it can significantly alter the metabolism of other drugs the liver is already struggling to process. It is not recommended for patients with severe hepatic failure or active biliary obstruction.

> Important: Special populations require individualized medical assessment and should never self-prescribe botanical extracts.

Nasturtium Officinale exerts its effects through several distinct molecular pathways:

1. 1Enzyme Modulation: The primary bioactive, Phenethyl Isothiocyanate (PEITC), acts as a competitive inhibitor of Cytochrome P450 2E1 (CYP2E1). This enzyme is responsible for the metabolic activation of many small carcinogenic molecules. By blocking this, PEITC serves a chemopreventive role.
2. 2Phase II Induction: It activates the Nrf2 (Nuclear factor erythroid 2-related factor 2) pathway, which increases the transcription of antioxidant and detoxification enzymes such as glutathione S-transferase (GST) and quinone reductase.
3. 3Neuromuscular Interaction: As an Acetylcholine Release Inhibitor [MoA], it may interfere with the calcium-dependent exocytosis of acetylcholine from motor neurons, although this effect is typically sub-clinical at standard doses.
4. 4Adrenergic Agonism: It contains trace catecholamines and related phenethylamines that can bind to and activate alpha-1, beta-1, and beta-2 adrenergic receptors, mimicking the effects of the sympathetic nervous system.

• Onset of Effect: Antioxidant and enzyme modulation effects begin within 2-4 hours of ingestion. Cardiovascular effects (if any) are typically transient.
• Duration of Effect: The inhibition of CYP2E1 can last for up to 24 hours following a single significant dose of the extract.
• Tolerance: There is no evidence of pharmacological tolerance developing with repeated use, although the induction of Phase II enzymes may reach a plateau.

| Parameter | Value |

|---|---|

| Bioavailability | ~80% (as PEITC) |

| Protein Binding | 90-95% (PEITC metabolites) |

| Half-life | 3 - 5 hours |

| Tmax | 1.5 - 2.5 hours |

| Metabolism | Hepatic (Glutathione conjugation) |

| Excretion | Renal (>80% as N-acetylcysteine conjugates) |

• Molecular Formula: C10H11NS (for Gluconasturtiin)
• Molecular Weight: 163.24 g/mol (for PEITC)
• Solubility: PEITC is lipophilic (fat-soluble), while the glucosinolate precursor and Vitamin C are hydrophilic (water-soluble).
• Structure: A phenethyl group attached to an isothiocyanate functional group (-N=C=S).

Nasturtium Officinale is categorized as a Vitamin C [EPC] and a Standardized Plant Allergenic Extract [EPC]. It shares therapeutic space with other cruciferous-derived compounds like Sulforaphane (from broccoli) and Indole-3-Carbinol.