All herbs
Aerial parts (flower, leaf)

Yarrow

Achillea millefolium — also: Soldier's woundwort, Milfoil

Traditional useGenerally low riskInteractions: LowPregnancy: Avoid
Benefits summary

Strong traditional reputation for minor wound care; little modern human-trial evidence.

Traditional & historical use

An ancient battlefield 'woundwort' (its name honors Achilles); used across Europe and by Indigenous peoples to staunch bleeding and for fevers and digestion.

Modern claims

Topical styptic for minor cuts; traditional digestive and fever herb.

How it may work

Astringent tannins and alkaloids (achilleine) may promote clotting; anti-inflammatory flavonoids in lab studies.

Benefit–risk at a glance
Potential benefits
  • Traditional styptic for minor cuts
  • Digestive/fever folk use
Most credible evidence

Mostly traditional and preclinical; human trials are scarce.

Key uncertainties
  • Little modern evidence
  • Best preparation unclear
Known risks
  • Daisy-family allergy
  • Photosensitivity
  • Pregnancy risk
Who should avoid
  • Pregnant people; those on blood thinners
Risks

Allergy in daisy-family-sensitive people; photosensitivity; uterine-stimulant reputation.

Interactions

Theoretical additive effects with blood thinners and BP medication.

Special populations

Avoid medicinal use in pregnancy (traditional emmenagogue/abortifacient reputation).

Sourcing & growing

Common wild and garden plant; dry aerial parts. Confirm identification (toxic look-alikes exist among umbellifers nearby).

Dr. Bull's read

A classic trail styptic for nicks and scrapes — keep it away from pregnancy and deep wounds.

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