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Herbs by Body System
Herbal medicine has always sorted plants by where in the body they work — the nervine for the nerves, the hepatic for the liver, the diuretic for the kidneys. This is that map across 248 herbs and 15 body systems.
No herbs act on this system yet.
Affinity
What It Means for a Herb to Act on a System
Long before anyone could name a single compound in a plant, people had noticed that plants are not general-purpose. Some work on the gut and do little anywhere else. Some go to the nerves, some to the kidneys, some to the skin. Sorting them by where they work is one of the oldest ideas in herbal medicine, and it is the one this index is built on.
The vocabulary still remembers it. A nervine is a herb for the nervous system; a hepatic works on the liver; a diuretic works through the kidneys. The effect and the territory are named in a single word, which is why the action index and this one keep converging.
None of this started as chemistry. It started as people noticing where a plant's effects turned up, over and over, and writing it down. Modern research comes at the same question from the other end — which tissues a compound actually reaches once it is swallowed. Often the two answers match. Where they don't, the page for that system says so.
Overlap
Most Herbs Belong to More Than One System
Of the 248 herbs here, 203 — 82% — act on more than one system, and the average herb is filed under 2.9 of them. Yarrow appears on eight lists: it stops bleeding, moves a fever, bitters the digestion, eases a cramp, brings on a late period and closes a wound — and all six of those are one plant doing what its chemistry does.
That breadth is not vagueness. It is the honest difference between a herb and a drug. A drug is refined toward a single target, and a whole plant was never refined at all — it arrives carrying dozens of active compounds, and they do not agree to stay in one chapter.
So the same herbs recur as you move between systems, in different company each time, and the company is what changes their meaning. Ginger among the digestive herbs is a warming carminative for nausea; the same ginger sits among the musculoskeletal herbs on the strength of osteoarthritis trials. Position on a list is not a ranking — read the monograph before choosing between two plants that sit side by side.
Evidence
The Systems Are Not Equally Well Studied
How much good human evidence sits behind a system varies enormously, and it varies for reasons that have surprisingly little to do with how well the herbs work.
The digestive herbs carry the most human trial evidence of any system here, across 106 plants. The skin and oral lists do well for a more mundane reason: they are easy to test. A cream or a mouthwash can be randomised and blinded against a convincing placebo, which is why herbs from those two shortish lists have been run head to head against hydrocortisone, triamcinolone and chlorhexidine — comparisons the internal herbs rarely get.
At the other end, the lymphatic herbs are the least evidenced on the site. The category is coherent, centuries old, and still in daily clinical use, and not one controlled human trial stands behind it. That is worth knowing before you use it, and it is not a reason the tradition should be hidden.
Size is a poor guide to interest, too. The ocular list is one of the shortest on the page and holds a genuine surprise — saffron has repeated randomised trials in macular degeneration. And the hepatobiliary list is the one to read most carefully: the liver is where herbal medicine most reliably causes the condition it sets out to treat, so on that page the safety half matters as much as the materia medica.
Elsewhere
Other Ways Into the Materia Medica
Body system is one of five ways into the same material, and the others answer different questions.
- Herbs by Action — what the plant does, rather than where it does it. The place to start when you know the effect you want but not the herb.
- Herbs by Part Used — root, bark, leaf, flower, seed. Two medicines from one plant are common, and they are rarely interchangeable.
- Conditions — straight to a named complaint, when the question is already specific.
- Plant Families — the botanical relationships, which quietly predict both the chemistry and several of the allergies.
- Explore the Herbs — the full library, all 248 of them, unfiltered.
Clinical herbalist and the writer behind The Sunlight Experiment — an evidence-based pharmacopoeia of herbs, supplements, and the chemistry behind them.
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