About Echinacea

Flowering plant from the daisy family, native to North America. Taken mostly to fend off colds.

Effectiveness Scores

Immune Support: 6.0/10 (moderate evidence).
Echinacea appears to wake up parts of the immune system that respond to viruses. In lab tests, it also blocks some viruses directly.
Why this rating: Taken every day, echinacea may lower your chances of catching a cold by about 10 to 20%. That's a small effect, and not every study finds it. Once you already have a cold, it doesn't seem to make it shorter or milder. Results are all over the place partly because "echinacea" can mean different species and plant parts, and most products on the shelf have never been tested. If you try it, take it daily before cold season rather than waiting until you feel sick.
Skin Health: 4.0/10 (moderate evidence).
Applied to the skin, echinacea may calm redness and irritation, help small wounds heal, and fight the bacteria behind acne.
Why this rating: Most of the support comes from lab and animal studies. A small number of human studies found some improvement with echinacea creams for eczema, but there isn't enough research to know how well it works. Low risk to try on minor skin problems, unless you're allergic to daisies or ragweed.
Mood Support: 3.0/10 (moderate evidence).
Echinacea may affect the endocannabinoid system, part of the body's natural system for handling stress and mood.
Why this rating: One well-run study found a specific echinacea extract eased anxiety within about a week. Another study didn't find the same benefit. With so little research and conflicting results, it's too early to say whether it helps.

Understanding Effectiveness Scores

What does this mean?

Our effectiveness scoring system is based on scientific research and evidence. Each health outcome is rated on a scale of 1-10, with higher scores indicating stronger scientific support for the supplement's effectiveness.

1/10: Scientific evidence concludes that supplement is ineffective for purpose
2/10: No scientific evidence supports effectiveness
3/10: Inconclusive results regarding effectiveness
4/10: Minimal research on effectiveness
5/10: Limited evidence of effectiveness; may have potential benefits, but more research is needed
6/10: Some evidence supports the supplement's effectiveness, but research is mixed
7/10: Moderate evidence shows the supplement is effective for certain purposes, with limited population studies
8/10: Solid evidence suggests the supplement is effective, but research is not as extensive as higher levels
9/10: Strong scientific evidence supports the supplement's effectiveness, but some minor gaps in research remain (e.g., limited long-term studies or specific populations).
10/10: Ample scientific research demonstrates that the supplement is both highly effective and safe for long-term use.

Form Variations

Purpurea (flowers and leaves)
The most studied species. Most of the cold prevention research used products made from the parts that grow above ground.
Best for: matching the cold research
Angustifolia (root)
A second species, used mostly from the root. The anxiety study used this form.
Best for: matching the anxiety research

Dosage & Timeline

Standard Dosages

Liquid extract: up to 10 mL a day
Dried capsules or tablets: up to 900 mg a day

Products vary a lot by species, plant part, and strength, so follow the label for the specific product you buy.

Timeline to See Results

The research that found a small benefit had people take echinacea every day, before getting sick, for up to four months during cold season. Taking it once a cold has started hasn't been shown to shorten it.

All other outcomes may be noticed after extended use or lack sufficient studies to establish an effectiveness timeline.

Safety Information

Pregnancy and breastfeeding: Short-term use, like during a cold, is generally considered low risk, but there isn't much research. Check with your doctor first.
Children: In a large study of children with colds, echinacea didn't make colds shorter or milder, and the children taking it got rashes more often. Talk to your child's doctor before giving it.

Allergies: Echinacea is in the same family as ragweed, daisies, marigolds, and chrysanthemums. If any of those cause you problems, avoid echinacea. Reactions can be serious.
Autoimmune conditions: Echinacea may stimulate the immune system, which could make conditions like lupus, rheumatoid arthritis, or multiple sclerosis worse. Talk to your doctor first.

Drug interactions: If you take medication to calm your immune system, like steroids or drugs taken after an organ transplant, echinacea could work against it. Check with your doctor.
Other medications: Echinacea can change how your liver processes some medications. If you take any prescription regularly, ask your pharmacist before adding it.

Side Effects

Common side effects:

Mild stomach upset or nausea
Dry mouth or a bitter, tingling taste, mostly with tea and liquid extracts
Skin rash or irritation, especially with creams

Rare side effects:

Severe allergic reaction in people allergic to ragweed, daisies, marigolds, or chrysanthemums
A few reports of liver problems, though echinacea isn't considered a likely cause

Usage Information

Most people take echinacea to avoid catching colds. It's also used on the skin for minor wounds and acne and occasionally for stress and anxiety.

Echinacea is a helper, not a treatment. It shouldn't replace medical care for an infection that's getting worse or not going away.

User Experience

Gathered from reviews and forum posts, not from studies. What people report tells you what to expect. It does not tell you whether something works.

Many people say their colds are milder and they recover faster when they start echinacea at the first sign of illness, though plenty notice no difference. That's one of the places where user reports and research disagree.

On the skin, people using it for acne or small cuts report modest improvements that take time. A few mention feeling a little less stressed or anxious, but that's less common.

Alternative Names

Coneflower, Purple Coneflower, American coneflower, Scurvy Root

Echinacea