Hormonal/Inflammation/Heart

Nettle leaf

Stinging nettle leaf herb used for seasonal allergies and mild metabolic support in adults, with mixed human evidence.

Nettle leaf

Stinging nettle leaf herb used for seasonal allergies and mild metabolic support in adults, with mixed human evidence.

score

evidence

Caution

risk

Proven Benefits

01Improves glycemic control

02May reduce allergy symptoms

03May lower blood pressure

04May lower inflammatory markers

05May improve lipid profile

06May ease joint pain

Chemical Forms

Recommended

Freeze-dried nettle leaf
Standardized nettle leaf extract
Dried nettle leaf tea

Avoid

Nettle root products (different indication, mainly prostate-related)
Whole-herb blends with unspecified plant part or extract ratio

Expert Note

Human studies on allergy often use freeze-dried leaf, while metabolic trials more often use leaf extracts. Root products are chemically different and are studied mainly for benign prostate symptoms, so their results should not be transferred to leaf supplements.

Protocol

Amount

900-1500 mg

Frequency

Split into 2-3 doses daily

When

With meals if using capsules or extracts; tea can be taken any time of day.

Condition-Based Dosing

Seasonal allergy support

300 mg freeze-dried leaf, 2-3 times daily during symptom periods.— Evidence is mixed; stop after a few weeks if you notice no clear benefit.

Traditional tea use

2-4 g dried leaf infused in hot water, 1-3 times daily.— Tea is milder and may be better tolerated than concentrated extracts.

Adjunct glycemic support under clinician supervision

500 mg leaf extract, 3 times daily with meals for 8-12 weeks.— Use only with medication review because nettle may add to glucose-lowering effects.

Safety & Limits

Upper Safe Limit

No official UL established; up to 1500 mg/day of leaf extract has been used short-term in human studies.

Cycling

Safe for continuous use

Contraindications

Pregnancy — supplement-dose safety data are limited; use only if a clinician approves

Antidiabetic drugs or insulin — may add to glucose-lowering effects

Antihypertensive drugs — may add to blood-pressure lowering

Diuretics or lithium — possible changes in fluid balance and lithium handling

Warfarin or other vitamin K–sensitive anticoagulants — whole-leaf products can vary in vitamin K content

Kidney disease — diuretic effects may be problematic without medical guidance

Synergies

Quercetin

Quercetin targets mast-cell and histamine-related pathways that overlap with nettle’s allergy-focused use.

Vitamin C

Vitamin C may complement nettle in seasonal-allergy protocols by supporting normal histamine breakdown.

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