Arnica is the mountain daisy you rub on, never swallow. Its yellow flower heads have been macerated into tinctures, oils and ointments since the Middle Ages, and herbalists still reach for them after a knock on the shin, a bruised knee or a long day of digging. This page covers which part to use, in what form, and the hard limits that come with it.
Arnica flower heads are the only part used, and always externally
Early to midsummer, when the flowers are fully open
Taste
Intensely bitter and aromatic — and not to be tasted: external use only
What it is credited with
European folk medicine has used arnica preparations since the Middle Ages as a rub for bruises and bumps after a fall or a knock.
Herbalists traditionally apply it to stiff, overworked muscles and aching joints, on unbroken skin.
Naturopathy credits the flowers with a soothing action on minor swelling where the skin is intact.
In traditional dermatological use, diluted preparations were dabbed on insect bites and irritated patches of skin.
Old herbals mention diluted arnica tincture as a mouth rinse for sore gums and sore throat; given how toxic the plant is if swallowed, this use belongs with practitioners, not the kitchen cupboard.
Country practice also used a weak decoction of the flowers as a hair rinse against lice.
Homeopathy, which counts arnica among its earliest remedies, is famous for prescribing it around knocks, strains and the aftermath of surgery. That is a claim its own proponents make for the granules, not a property of the raw plant.
How to use it
Everything below is for the outside of the body. Arnica is not a tea plant.
Arnica tincture (the classic)
Fill a jar loosely with dried flower heads, cover well with high-proof alcohol, seal and keep in the dark.
Shake daily and leave to macerate for about ten days, then strain into a dark glass bottle.
Never use it neat: dilute it generously in water before soaking a compress.
Lay the compress on the bruised area for a quarter of an hour or so, once or twice a day, for a few days at most.
Oil macerate and ointment
Steep dried flowers in a neutral vegetable oil in a warm spot for two to three weeks, strain, and keep cool.
Massage a small amount into tired legs, shoulders or calves, on intact skin only.
Shop-bought gels and creams follow the same logic and are easier to dose.
Decoction as a hair rinse
Simmer a modest pinch of dried flowers in water, let cool, strain well.
Use as a final rinse on the scalp, then rinse out with clear water. Keep it away from eyes and mouth.
Discard leftovers — do not keep a decoction more than a day.
Homeopathic granules
Sold ready-made in tubes; taken under the tongue according to the maker’s leaflet.
These are the one arnica form designed to be put in the mouth, for the reason explained in the cautions box.
Granules are the one arnica form meant for the mouth
Forms of arnica and what each is used for
Form
Preparation
Traditional purpose
Tincture
Flowers macerated in high-proof alcohol for about ten days, then heavily diluted
Compresses on bruises and bumps, unbroken skin
Oil macerate
Flowers steeped in vegetable oil for two to three weeks
Massage for stiff muscles and tired legs
Ointment or gel
Ready-made, arnica extract in a fatty or water base
Everyday use on knocks and aching joints
Decoction
A pinch of dried flowers simmered in water, cooled
Scalp rinse in country practice against lice
Homeopathic granules
Extreme dilutions carried on sugar granules
The form homeopathy uses around knocks and strains
A plant worth protecting
Arnica belongs to high pastures and unfertilised mountain grassland
Arnica needs poor, unfertilised grassland. Fertilising mountain meadows for hay wiped it out across large areas.
In the French Vosges mountain range, endangered by intensive cattle raising for which entire fields were fertilized to produce hay, arnica might have disappeared completely if not for a vast grassroots eco-campaign.
Farmers, harvesters, municipalities, pharmaceutical laboratories and National Park rangers signed an “Arnica convention” setting out how the wild stands are managed.
Its rules include manual pulling of harvested plants and matching harvest quantities directly to laboratory orders.
Managed harvesting lets wild arnica bloom again year after year
Frequently Asked Questions
The one thing to remember: arnica goes on the skin, never down the throat — a diluted compress or a ready-made gel on unbroken skin is the whole everyday use.
Can I drink arnica as a herbal tea?
No. Arnica is highly toxic if ingested: a compound called arnicine can lead to fatal poisoning. It is used externally only, with the single exception of homeopathic preparations. Never brew the flowers as a drink.
Why are homeopathic arnica granules taken by mouth then?
In homeopathy, plant extracts are diluted to such a degree that the resulting compounds are virtually absent, which is why ingesting arnica homeopathy granules isn’t considered dangerous. Homeopathy explains the effectiveness as being transferred to the water and sugar of the granules, while eliminating the toxic aspects of the plant. Follow the maker’s leaflet.
How do I make and use an arnica compress?
Macerate dried flower heads in high-proof alcohol for about ten days, shaking daily, then strain into a dark bottle. Dilute the tincture generously in water, soak a cloth and lay it on the bruised area for around a quarter of an hour, once or twice a day for a few days. Keep it off open wounds, eyes and mouth.
When do I pick arnica flowers?
Early to midsummer, when the heads are fully open and the weather is dry. Wild arnica is protected or regulated in many regions, so check the rules and take only a small share; buying dried flowers from a herbalist is usually the better option.
Is arnica safe in pregnancy or for children?
Arnica is best avoided in pregnancy and while breastfeeding, and is not applied to young children without professional guidance. If you take any medication, especially blood thinners, or are facing surgery, check with a pharmacist or doctor first.
This information is provided for general interest and reflects the traditional use of plants. It is not a substitute for medical advice. If you are on medication, pregnant, or in any doubt, ask a healthcare professional.
Written by Gaspard Lorthiois | Loves helping out, especially when it comes to growing things. Worked in herbal medicine, runs a farm, and dabbles in tech. Master's degree and engineer.
