Plant Comparison

Eyebright vs Chaga

A side-by-side comparison of two medicinal plants — every documented constituent, action, use, safety note and cited source, assembled automatically from the Omnia Sana database.

First plant
Second plant
Show:
Plant AEyebrightEuphrasia officinalisOrobanchaceaeFull monograph →
Plant BChagaInonotus obliquusHymenochaetaceaeFull monograph →

At a glance

Eyebright and Chaga: they share 6 indicated uses (arthritis / joint pain, cancer (anticancer research), infection (general), …); 2 pharmacological actions in common.

EyebrightChaga
Constituents33
Pharmacological actions310
Indicated uses1211
Safety notes22
Cited sources1441
Indicated uses
Only Eyebright
Allergy / hay feverCoughDiarrhoeaEye strain / eye healthFeverRespiratory support
Shared (6)
Arthritis / joint painCancer (anticancer research)Infection (general)Inflammation (general)Skin irritationWounds
Only Chaga
Cold & fluImmune supportMetabolic supportCognitive functionCardiovascular / heart health
Pharmacological actions
Only Eyebright
Astringent
Shared (2)
Anti-inflammatoryAnticancer (preclinical)
Only Chaga
AntimicrobialAntioxidantImmunomodulator / immune supportNephroprotective (kidney support)Neuroprotective / cognition supportAntidiabetic (blood-sugar lowering)Hepatoprotective (liver support)Lipid-lowering

Evidence face-off — shared uses

ConditionEyebrightChagaVerdict
Arthritis / joint pain1/101/10Comparable evidence
Cancer (anticancer research)2/102/10Comparable evidence
Infection (general)2/101/10Comparable evidence
Inflammation (general)2/101/10Comparable evidence
Skin irritation1/101/10Comparable evidence
Wounds1/101/10Comparable evidence

Evidence scores (1–10) are computed from the tier of each cited source. “Comparable” means the two scores are within one point. Follow a score to its detailed sources.

Key Constituents

Iridoid glycosides (notably aucubin)[11, 12]

Give the plant its anti-inflammatory action on irritated tissue.

Iridoid glycosidesGlycosides
Tannins[11]

Astringent constituents useful in watery, irritated eyes.

Tannins
Flavonoids (quercetin) and phenolic acids[11, 12]

Antioxidant constituents.

Phenolic acidsFlavonoidsQuercetin
Melanin-rich pigments and betulinic acid derivatives[1]

Chaga's dark colour comes from melanin-like pigments; it also concentrates betulinic-acid-type triterpenes absorbed from its birch host, associated with antioxidant and anticancer research interest.

Polysaccharides (beta-glucans)[4]

Immunomodulatory polysaccharides contributing to the traditional tonic and immune-support use.

Polysaccharides
Phenolic compounds[4]

Antioxidant phenolics contributing to chaga's free-radical-scavenging activity.

Phenolic compounds

Pharmacological Actions

Anti-inflammatory[4, 5, 10, 11, 12]

Astringent and anti-inflammatory for eye irritation, redness and conjunctivitis (traditional, as an eye compress or bath) - an open prospective cohort of Euphrasia single-dose eye drops reported recovery or clear improvement in most patients with conjunctivitis

Anticancer (preclinical)[10]
Astringent[11, 12]

Astringent and anti-inflammatory for eye irritation, redness and conjunctivitis (traditional, as an eye compress or bath) - an open prospective cohort of Euphrasia single-dose eye drops reported recovery or clear improvement in most patients with conjunctivitis

Anti-inflammatory[4, 5, 9, 13, 15, 19, 27, 30, 38, 39, 40]
Anticancer (preclinical)[15, 17, 21, 22, 26, 28, 31, 38]
Antimicrobial[38, 39, 40]
Antioxidant[8, 10, 12, 29, 35, 38, 39, 40]
Immunomodulator / immune support[2, 4, 7, 14, 16, 19, 26, 32, 37, 38, 39, 40]
Nephroprotective (kidney support)[20]
Neuroprotective / cognition support[24, 35]
Antidiabetic (blood-sugar lowering)[25, 31, 34, 36]
Hepatoprotective (liver support)[28]
Lipid-lowering[33, 36]

Traditional & Indicated Uses

Allergy / hay fever[11]Traditional · 1/10

Eases eye strain and watery, itchy eyes from allergy (hay fever / allergic conjunctivitis)

Evidence: 1
Label: Allergy / hay fever
Arthritis / joint pain[11, 12]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Arthritis / joint pain
Cancer (anticancer research)[10]Traditional · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)
Cough[11]Traditional · 1/10

Soothes upper-respiratory catarrh and mild infection (traditional)

Evidence: 1
Label: Cough
Diarrhoea[11, 12]Traditional · 1/10

inferred from astringent action

Evidence: 1
Label: Diarrhoea
Eye strain / eye health[11, 12, 13]Limited · 3/10

Astringent and anti-inflammatory for eye irritation, redness and conjunctivitis (traditional, as an eye compress or bath) - an open prospective cohort of Euphrasia single-dose eye drops reported recovery or clear improvement in most patients with conjunctivitis; Eases eye strain and watery, itchy eyes from allergy (hay fever / allergic conjunctivitis)

Evidence: 3
Label: Eye strain / eye health
Fever[11]Traditional · 1/10

Eases eye strain and watery, itchy eyes from allergy (hay fever / allergic conjunctivitis)

Evidence: 1
Label: Fever
Infection (general)[10, 11]Traditional · 2/10

Soothes upper-respiratory catarrh and mild infection (traditional)

Evidence: 2
Label: Infection (general)
Inflammation (general)[10, 11, 12]Traditional · 2/10

inferred from anti-inflammatory action

Evidence: 2
Label: Inflammation (general)
Respiratory support[11]Traditional · 1/10

Soothes upper-respiratory catarrh and mild infection (traditional)

Evidence: 1
Label: Respiratory support
Skin irritation[11, 12]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Skin irritation
Wounds[11, 12]Traditional · 1/10

inferred from astringent action

Evidence: 1
Label: Wounds
Arthritis / joint pain[38, 39, 40]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Arthritis / joint pain
Cancer (anticancer research)[15, 21, 38]Traditional · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)
Cold & flu[38, 39, 40]Traditional · 1/10

inferred from immunomodulator action

Evidence: 1
Label: Cold & flu
Immune support[14, 38, 39, 40]Traditional · 2/10
Evidence: 2
Label: Immune support
Infection (general)[38, 39, 40]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Infection (general)
Inflammation (general)[38, 39, 40]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Inflammation (general)
Metabolic support[38, 39, 40]Traditional · 1/10
Evidence: 1
Label: Metabolic support
Skin irritation[38, 39, 40]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Skin irritation
Wounds[38, 39, 40]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Wounds
Cognitive function[24, 35]Traditional · 2/10

Chaga-derived 3,4-DHBA protected against Parkinson's-related neurotoxicity (preclinical).

Evidence: 2
Label: Cognitive function
Cardiovascular / heart health[33]Traditional · 2/10

Chaga polysaccharide lowered lipids in vivo and in vitro.

Evidence: 2
Label: Cardiovascular / heart health

Safety, Cautions & Contraindications

Safety note[11]Caution

CRITICAL: do not put non-sterile, homemade eyebright preparations directly into the eye - this risks serious eye infection. Use only commercially prepared sterile products in the eye, or apply a strained, cooled infusion as a compress over closed eyelids.

Safety note[11]Caution

Traditional use only; persistent eye symptoms, pain, discharge or vision change need assessment by an eye-care professional. Safety in pregnancy and breastfeeding is not established.

Safety note[38, 39, 40]Caution

Autoimmune conditions: Chaga can stimulate parts of the immune system—people with autoimmune diseases should be cautious.Blood thinners: Chaga contains compounds that may affect clotting—avoid large doses if on anticoagulants.Blood sugar meds: May slightly lower glucose—monitor if taking diabetes medication.Pregnancy & breastfeeding: Limited safety data—best avoided unless guided by a professional.Quality matters: Wild-harvested Chaga can accumulate heavy metals from trees and soil—source from reputable suppliers.

Safety note[38, 39, 40, 41]Info

Duke (2002) does not include a dedicated entry for chaga (Inonotus obliquus) in the Handbook of Medicinal Herbs, Second Edition, as this medicinal fungus was not widely documented in Western herbal literature at that time (Duke, 2002).

External Ids

Gbif: 8106874
Powo: urn:lsid:ipni.org:names:802732-1
Wikidata: Q17813184
Gbif: 2521089
Wikidata: Q1956937

Botanical Description

Small, semi-parasitic annual herb (drawing some nutrients from the roots of neighbouring grasses) with tiny, opposite, toothed leaves and delicate, two-lipped white to pale lilac flowers marked with purple veins and a yellow throat spot, giving a bright, eye-like appearance that inspired both its common and Latin names.[11]

Height: 5-20 cm
Habit: Small, semi-parasitic annual herb
Leaves: Tiny, opposite, toothed
Flowers: Small, two-lipped, white to pale lilac, purple-veined with a yellow throat spot
Stem: Slender, often branched, hairy
Root: Slender root system that taps into neighbouring grass roots (hemiparasitic)
Fruit: Small, flattened, hairy capsule
Flowering Period: June-September

Parasitic wood-decay fungus (not a true plant) that grows almost entirely inside the trunk of living birch trees, visible externally only as a hard, black, cracked, charcoal-like mass (a sclerotium, sometimes called a 'conk') erupting through the bark. Unlike typical mushrooms, chaga has no true cap, gills or stem; its fertile spore-producing surface develops later, hidden beneath the bark after the tree dies.[1]

Height: External mass 10-40 cm
Habit: Parasitic wood-decay fungus, growing mostly inside the host tree
Leaves: Not applicable (fungus)
Flowers: Not applicable (fungus); reproduces by spores
Stem: No true cap-and-stem structure; visible only as a hard black external mass (sclerotium)
Root: Fungal mycelium spreading through the living wood of the host tree
Fruit: Fertile spore-producing layer develops hidden beneath the bark, typically after the host tree dies
Flowering Period: The visible black mass persists and grows for years; not a seasonal fruiting body

Habitat

Grows in short, unimproved grassland, pastures, meadows and dunes on well-drained soils, always in association with grasses on which it partially parasitises; native to Europe.[11]

Grows almost exclusively as a parasite on living birch trees in cold, northern temperate and boreal forests of Europe, Russia, North America and Asia.[1]

Harvesting

The flowering aerial parts are cut in summer while in flower and dried in a warm, shaded, airy place.[11]

Parts: Aerial parts (flowering herb)
Season: Summer, at flowering

The hard black external mass (conk) is chopped or broken away from the living birch trunk, ideally without killing the tree, then dried and broken into pieces or ground for use; sustainable harvesting (leaving part of the conk to regrow) is recommended given the fungus's slow growth.

Parts: Mycelium, Whole Plant

Traditional Uses

Eyebright has a centuries-old European folk reputation, reflected in its common name, as a soothing remedy for irritated, red or watery eyes and conjunctivitis, traditionally applied as a cooled compress or eyewash, and taken internally as an astringent for catarrh and mild digestive upset.[11, 12]

Chaga has a long traditional use in Russian, Siberian, Baltic and Scandinavian folk medicine as a tonic remedy for digestive complaints, immune support and general vitality, traditionally taken as a dark, tea-like decoction; this traditional tonic reputation is now studied for its antioxidant, immunomodulatory and anti-inflammatory properties.[1, 4]

Preparations

Cooled compress/eyewash[11]

Strained, cooled infusion applied as a compress over closed eyelids, or used (only when sterile, commercially prepared) as an eyewash for irritated or red eyes.

Sterile eye drops[13]

Commercially prepared, sterile Euphrasia eye drops used for conjunctivitis; a prospective clinical cohort found improvement in most users.

Decoction[1]

Chunks of the dried black conk simmered gently in water for an extended period, producing a dark, tea-like traditional tonic.

Standardised extract[4]

Extract standardised to polysaccharide or polyphenol content, taken as capsules or powder.

Dosage

Compress/eyewash[14]

No dose is given here because no official posology exists. The HMPC assessed eyebright and DECLINED to establish a herbal monograph, concluding that the efficacy of the claimed uses is undocumented and that external eye application of ex tempore (home-prepared) preparations is 'not hygienic and not safe', so therapeutic use cannot be recommended. Traditional sources describe a strained, cooled infusion used as a compress, but that is precisely the practice the HMPC advised against; nothing home-prepared should be put in or on the eye. Educational reference only, not a prescription.

Not documented

References

REF-0812, REF-0813, REF-0814, REF-2173, REF-2174, REF-2175, REF-2176, REF-2177, REF-2178, REF-2581
REF-0848, REF-0849, REF-0850, REF-2195, REF-2196, REF-2197, REF-2198, REF-2199, REF-2200, REF-2201, REF-2202, REF-2203, REF-2204, REF-2969, REF-2970, REF-2971, REF-2972, REF-2973, REF-2974, REF-2975, REF-2976, REF-2977, REF-2978, REF-2979, REF-2980, REF-2981, REF-2982, REF-2983, REF-2984, REF-2985, REF-2986, REF-2987, REF-2988, REF-2989, REF-2990, REF-2991, REF-2992

Lookalikes Review

Outcome: none-known
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-07
Outcome: none-known
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-07

References & Sources

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  11. Herbal Reality (n.d.) 'Eyebright (Euphrasia officinalis): Benefits, Uses, Safety'. Available at: https://www.herbalreality.com/herb/eyebright/ Traditional / reference
    https://www.herbalreality.com/herb/eyebright/
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  13. Stoss, M., Michels, C., Peter, E., Beutke, R. and Gorter, R.W (2000) 'Prospective cohort trial of Euphrasia single-dose eye drops in conjunctivitis', Journal of Alternative and Complementary Medicine, 6(6), pp. 499--508. doi:10.1089/acm.2000.6.499 Clinical study
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    https://www.ema.europa.eu/en/documents/herbal-report/final-public-statement-euphrasia-officinalis-l-and-euphrasia-rostkoviana-hayne-herba_en.pdf
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Generated automatically from the Omnia Sana plant database and its cited sources. For educational purposes only — not medical advice. Always consult a qualified practitioner before using medicinal plants.