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Herbal Extract

Watercress Extract (Nasturtium officinale)

Also known as: Nasturtium officinale, watercress powder, watercress whole herb extract

C
Evidence

Watercress is a nutrient-dense cruciferous vegetable containing glucosinolates, vitamins, and minerals with preliminary evidence for antioxidant and anti-inflammatory effects. Most human studies involve whole watercress consumption rather than isolated extracts, limiting conclusions about extract efficacy.

Primary uses

  • Antioxidant support
  • Anti-inflammatory effects
  • General nutritional supplementation
  • Cardiovascular health support

How it works

  • Glucosinolate metabolism to isothiocyanates with potential phase II enzyme induction
  • Phenolic and flavonoid antioxidant activity
  • Potential inhibition of oxidative stress pathways

Dosage

Typical range
500–2,000 mg daily (powder form)
Timing
Any time of day
With food
Can be taken with or without food; taking with meals may improve absorption of fat-soluble compounds
Duration
No established optimal duration; typically used long-term for nutritional support
Special populations
Generally well-tolerated; avoid very high intakes in pregnancy due to limited safety data

Forms

  • Powder· 70/100
  • Whole herb extract· 70/100

Safety

Common side effects

  • Generally well-tolerated
  • Possible mild gastrointestinal upset at high doses
  • Potential skin irritation with topical contact in sensitive individuals

Contraindications

  • Individuals taking warfarin or other vitamin K–dependent anticoagulants (watercress is high in vitamin K)
  • Known allergy to Brassicaceae family plants
  • Pregnant or nursing individuals should use cautiously due to limited safety data

Evidence notes

Limited clinical evidence specific to watercress extract. Most research uses whole watercress consumption showing modest benefits for oxidative stress and inflammation. Extract form lacks robust RCT data. Traditional use is well-established but modern extract research is preliminary.

Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.