Know what you're putting in your body.

158 herbs, nutrients, and compounds. What the science says, what tradition knew, and what to watch for. Founding members keep this running.

$60 /year

Founding rate — locked for life. Regular price after launch: $96/year.

✓ Full access to all 158+ entries
✓ Print-ready reference card for every herb
✓ Monthly curated set — 5 herbs, one body system
✓ The Sunday Letter — weekly research digest
✓ Bookmarks synced across devices
✓ Founding rate locked forever

Become a founding member

Cancel any time. No questions asked.

WOUND & SCAR HEALING

Comfrey

Symphytum officinale

also known as comfrey root, comfrey leaf

Comfrey — Köhler 1887 botanical illustration

A topical-only herb, traditionally used on bruises, sprains, and slow-healing wounds. The root and leaf contain pyrrolizidine alkaloids that can cause severe liver injury if taken internally — never swallow.

Eases bruises, sprains, and muscle strains topically
Supports the healing of broken bones — old folk name is knitbone
Allantoin promotes skin cell turnover
Mucilage soothes inflamed skin

Topical use only — never take internally

Pyrrolizidine alkaloids can cause severe liver injury (veno-occlusive disease)

Do not apply to broken or open skin

Avoid in pregnancy and nursing

Do not use on infants or young children

Limit topical use to 4 to 6 weeks at a time

Memorial Sloan Kettering About Herbs · EMA Herbal Medicinal Product Monographs · American Botanical Council HerbMedPro · Memorial Sloan Kettering About Herbs · EMA Herbal Medicinal Product Monographs · American Botanical Council HerbMedPro

You might also explore

The curious few.

50 founding spots left