Tea Tree Oil
9 benefits mapped to clinical evidence across supplements.
Benefit Evidence
Plaque/gingivitis ↓; bacteria↓
Halitosis/VSC ↓; ~1.42 points
GI/PBI ↓; plaque↔
Research sources
Skin soothing (13)
- Efficacy and tolerability of hyaluronic acid, tea tree oil and methyl-sulfonyl-methane in a new gel medical device for treatment of haemorrhoids in a double-blind, placebo-controlled clinical trial
PubMed ID: 22492249
Hyaluronic acid + TTO + MSM gel reduced hemorrhoid pain/pruritus versus placebo (confounded product).
- Comparison of clinical and histological effects between lactobacillus-fermented Chamaecyparis obtusa and tea tree oil for the treatment of acne: an eight-week double-blind randomized controlled split-face study
PubMed ID: 25228478
5% TTO decreased inflammatory acne lesions moderately (38% reduction), consistent with spot‑treatment potential.
- Combination of essential oil of Melaleuca alternifolia and iodine in the treatment of molluscum contagiosum in children
PubMed ID: 22395586
High lesion clearance with TTO+iodine suggests effectiveness for treating individual molluscum lesions.
- A comparative study of tea-tree oil versus benzoylperoxide in the treatment of acne
PubMed ID: 2145499
Topical 5% TTO gel reduced acne lesions — applicable to spot/targeted treatment.
- Treatment of dandruff with 5% tea tree oil shampoo
PubMed ID: 12451368
5% TTO shampoo reduced itchiness associated with dandruff vs placebo.
- Topical tea tree oil effective in canine localised pruritic dermatitis--a multi-centre randomised double-blind controlled clinical trial in the veterinary practice
PubMed ID: 15568640
10% TTO cream in dogs produced faster and higher rates of clinical success and pruritus relief vs control.
- The efficacy of 5% topical tea tree oil gel in mild to moderate acne vulgaris: a randomized, double-blind placebo-controlled study
PubMed ID: 17314442
5% TTO gel improved acne lesion counts vs placebo → supports targeted spot use.
- Ocular surface discomfort and Demodex: effect of tea tree oil eyelid scrub in Demodex blepharitis
PubMed ID: 23255861
Eyelid scrubs with TTO reduced ocular discomfort/OSDI scores → symptomatic soothing.
- Comparison of Efficacy and Safety of Two Tea Tree Oil-Based Formulations in Patients with Chronic Blepharitis: A Double-Blinded Randomized Clinical Trial
PubMed ID: 31429629
3% TTO eyelid gels improved symptom scores, tear stability, and reduced inflammatory tear cytokines, demonstrating topical soothing effects.
- A topical gel of tea tree oil nanoemulsion containing adapalene versus adapalene marketed gel in patients with acne vulgaris: a randomized clinical trial
PubMed ID: 34251536
Adjunctive TTO nanoemulsion with adapalene yielded faster/greater lesion reduction, supporting spot/targeted acne benefit.
- Role of Blepharoexfoliation in Demodex Blepharitis: A Randomized Comparative Study
PubMed ID: 35439775
Single blepharoexfoliation plus TTO scrubs reduced symptoms more than scrubs alone, indicating clinically meaningful soothing for Demodex blepharitis.
- Effect of Tea Tree Oil and Coconut Oil on Nipple Crack Formation in the Early Postpartum Period
PubMed ID: 36763614
Topical TTO on nipples postpartum significantly lowered pain scores and reduced cracking, a clear topical soothing/healing effect.
- Swabs Containing Tea Tree Oil and Chamomile Oil Versus Baby Shampoo in Patients With Seborrheic Blepharitis: A Double-Blind Randomized Clinical Trial
PubMed ID: 34310352
TTO‑containing eyelid swabs gave greater symptomatic improvement (BLISS, OSDI) than baby shampoo in blepharitis patients.
Skin health (9)
- Antimicrobial and hand hygiene effects of Tea Tree Essential Oil disinfectant: A randomised control trial
PubMed ID: 33950544
10% TTO hand disinfectant RCT showed significant reductions in ATP and bacterial density on hands vs control—strong evidence of cleansing/disinfection.
- Swabs Containing Tea Tree Oil and Chamomile Oil Versus Baby Shampoo in Patients With Seborrheic Blepharitis: A Double-Blind Randomized Clinical Trial
PubMed ID: 34310352
TTO‑containing eyelid swabs reduced Demodex counts and improved blepharitis symptoms more than baby shampoo, supporting cleansing efficacy.
- Treatment of interdigital tinea pedis with 25% and 50% tea tree oil solution: a randomized, placebo-controlled, blinded study
PubMed ID: 12121393
25–50% TTO solutions improved interdigital tinea pedis clinically and mycologically vs placebo → antifungal cleansing action.
- A randomized, controlled trial of tea tree topical preparations versus a standard topical regimen for the clearance of MRSA colonization
PubMed ID: 15066738
Tea tree–based eradication regimen cleared MRSA from superficial skin sites better than comparator → topical cleansing/antisepsis.
- Ocular surface discomfort and Demodex: effect of tea tree oil eyelid scrub in Demodex blepharitis
PubMed ID: 23255861
Regular eyelid scrubs with TTO significantly reduced Demodex counts → mechanical/antimicrobial cleansing effect.
- Comparison of Efficacy and Safety of Two Tea Tree Oil-Based Formulations in Patients with Chronic Blepharitis: A Double-Blinded Randomized Clinical Trial
PubMed ID: 31429629
TTO eyelid gels reduced Demodex presence and ocular surface inflammatory markers—direct cleansing/antiparasitic effect on lids.
- The effect of tea tree oil on dry eye treatment after phacoemulsification cataract surgery: A randomized clinical trial
PubMed ID: 31379213
Post‑cataract randomized trial: TTO eyelid shampoo significantly decreased eyelash Demodex counts (direct cleansing effect).
- Comparison of the Effect of Tea Tree Oil Shampoo With Regular Eyelid Shampoo in Meibomian Gland Dysfunction Treatment
PubMed ID: 33905746
Within‑subject trial showed TTO eyelid scrubs improved meibomian gland function and dry‑eye signs vs regular shampoo (cleansing/action on lids).
- Role of Blepharoexfoliation in Demodex Blepharitis: A Randomized Comparative Study
PubMed ID: 35439775
In‑office blepharoexfoliation plus TTO scrubs reduced Demodex and symptoms more than scrubs alone—strong cleansing signal in blepharitis.
Skin appearance (8)
- The efficacy of 5% topical tea tree oil gel in mild to moderate acne vulgaris: a randomized, double-blind placebo-controlled study
PubMed ID: 17314442
RCT: 5% TTO gel significantly reduced acne lesion counts and severity → clear skin appearance.
- Topical tea tree oil effective in canine localised pruritic dermatitis--a multi-centre randomised double-blind controlled clinical trial in the veterinary practice
PubMed ID: 15568640
10% TTO cream improved canine dermatitis quickly → suggests topical improvement of inflamed skin.
- A comparative study of tea-tree oil versus benzoylperoxide in the treatment of acne
PubMed ID: 2145499
Randomized single-blind trial showing lesion reductions vs benzoyl peroxide → improved skin clarity.
- Combination of essential oil of Melaleuca alternifolia and iodine in the treatment of molluscum contagiosum in children
PubMed ID: 22395586
TTO+iodine combination produced high molluscum lesion clearance → improved lesion appearance.
- Comparison of clinical and histological effects between lactobacillus-fermented Chamaecyparis obtusa and tea tree oil for the treatment of acne: an eight-week double-blind randomized controlled split-face study
PubMed ID: 25228478
5% TTO reduced inflammatory acne lesions ~38% at 8 weeks, indicating improved skin clarity vs baseline.
- Cosmetic Formulations with Melaleuca alternifolia Essential Oil for the Improvement of Photoaged Skin: A Double-Blind, Randomized, Placebo-Controlled Clinical Study
PubMed ID: 35668682
Topical TTO nanoemulsion produced measurable improvements in photoaging markers and dermal morphology, supporting clearer skin appearance.
- A topical gel of tea tree oil nanoemulsion containing adapalene versus adapalene marketed gel in patients with acne vulgaris: a randomized clinical trial
PubMed ID: 34251536
Adapalene formulated with TTO nanoemulsion produced significantly greater acne lesion and severity reductions vs standard adapalene.
- The efficacy and safety of permethrin 2.5% with tea tree oil gel on rosacea treatment: A double-blind, controlled clinical trial
PubMed ID: 31613050
Permethrin+TTO gel reduced Demodex and improved inflammatory rosacea signs, which can improve facial clarity (TTO contribution confounded).
Detoxification (6)
- Treatment of dandruff with 5% tea tree oil shampoo
PubMed ID: 12451368
5% TTO shampoo reduced dandruff and symptoms, consistent with antimicrobial/cleansing action on scalp.
- A randomized, controlled trial of tea tree topical preparations versus a standard topical regimen for the clearance of MRSA colonization
PubMed ID: 15066738
Tea tree–based regimen cleared MRSA from superficial skin sites more effectively than some comparators.
- Ocular surface discomfort and Demodex: effect of tea tree oil eyelid scrub in Demodex blepharitis
PubMed ID: 23255861
Frequent TTO eyelid scrubs significantly reduced Demodex counts (antimicrobial/antiparasitic cleansing).
- Antimicrobial and hand hygiene effects of Tea Tree Essential Oil disinfectant: A randomised control trial
PubMed ID: 33950544
10% TTO hand disinfectant RCT showed significant reductions in ATP and bacterial counts vs control—strong evidence of a natural antimicrobial cleanser.
- Comparison of two topical preparations for the treatment of onychomycosis: Melaleuca alternifolia (tea tree) oil and clotrimazole
PubMed ID: 8195735
Topical 100% TTO gave clinical improvement in onychomycosis though culture cures were low.
- Treatment of interdigital tinea pedis with 25% and 50% tea tree oil solution: a randomized, placebo-controlled, blinded study
PubMed ID: 12121393
25–50% TTO solutions gave clinical and mycological improvements in interdigital athlete's foot.
Scalp health (5)
- A randomised, assessor blind, parallel group comparative efficacy trial of three products for the treatment of head lice in children--melaleuca oil and lavender oil, pyrethrins and piperonyl butoxide, and a "suffocation" product
PubMed ID: 20727129
TTO+lavender product cured ~98% of head-lice cases → major scalp health benefit (lice control).
- Treatment of dandruff with 5% tea tree oil shampoo
PubMed ID: 12451368
Daily 5% TTO shampoo produced ~41% improvement in dandruff severity vs placebo → strong scalp benefit.
- Preparation and evaluation of a multimodal minoxidil microemulsion versus minoxidil alone in the treatment of androgenic alopecia of mixed etiology: a pilot study
PubMed ID: 23807837
Multicomponent minoxidil + diclofenac + 5% TTO product improved hair growth metrics vs minoxidil alone; TTO may contribute to scalp health/balance though effect is confounded.
- Control of the chewing louse Bovicola (Werneckiella) ocellatus in donkeys, using essential oils
PubMed ID: 23414090
Strong pediculicidal activity shown in vitro and on donkeys; suggests potential antiparasitic benefit relevant to scalp health (animal model).
- An ex vivo, assessor blind, randomised, parallel group, comparative efficacy trial of the ovicidal activity of three pediculicides after a single application--melaleuca oil and lavender oil, eucalyptus oil and lemon tea tree oil, and a "suffocation" pediculicide
PubMed ID: 21864348
Ex vivo TTO+lavender lotion showed moderate ovicidal activity against head lice eggs.
Acne (5)
- Combination of essential oil of Melaleuca alternifolia and iodine in the treatment of molluscum contagiosum in children
PubMed ID: 22395586
TTO+iodine markedly reduced molluscum lesions → strong blemish/lesion reduction when combined.
- A topical gel of tea tree oil nanoemulsion containing adapalene versus adapalene marketed gel in patients with acne vulgaris: a randomized clinical trial
PubMed ID: 34251536
Adapalene + TTO nanoemulsion achieved greater reductions in lesion counts and acne severity vs standard adapalene.
- The efficacy of 5% topical tea tree oil gel in mild to moderate acne vulgaris: a randomized, double-blind placebo-controlled study
PubMed ID: 17314442
Double-blind RCT: 5% TTO gel significantly reduced total acne lesions and severity vs placebo.
- A comparative study of tea-tree oil versus benzoylperoxide in the treatment of acne
PubMed ID: 2145499
Randomized trial: 5% TTO gel reduced lesion counts and had fewer side effects than benzoyl peroxide (clinical acne benefit).
- Comparison of clinical and histological effects between lactobacillus-fermented Chamaecyparis obtusa and tea tree oil for the treatment of acne: an eight-week double-blind randomized controlled split-face study
PubMed ID: 25228478
5% TTO led to a ~38% reduction in inflammatory acne lesions over 8 weeks, supporting blemish‑reducing action.
Oral health (4)
- Antimicrobial activity of garlic, tea tree oil, and chlorhexidine against oral microorganisms
PubMed ID: 12553397
0.2% TTO mouth rinse reduced mutans streptococci and other oral microbes (small study) → potential breath benefit.
- The effect of aloe vera and tea tree oil mouthwashes on the oral health of school children
PubMed ID: 31111439
Daily TTO mouthwash for 4 weeks reduced plaque, gingival indices and S. mutans counts comparably to chlorhexidine—supports oral antimicrobial/freshening effect.
- Efficacy of Melaleuca alternifolia and chlorhexidine mouth rinses in reducing oral malodor and Solobacterium moorei levels. A 1 week, randomized, double-blind, parallel study
PubMed ID: 35546457
One‑week RCT: TTO mouthwash produced large reductions in organoleptic halitosis scores, VSCs and Solobacterium moorei counts comparable to chlorhexidine.
- The effects of a tea tree oil-containing gel on plaque and chronic gingivitis
PubMed ID: 15293818
2.5% TTO gel reduced gingival inflammation/bleeding (improved oral health symptoms).
Hair & Nails (3)
- Treatment of toenail onychomycosis with 2% butenafine and 5% Melaleuca alternifolia (tea tree) oil in cream
PubMed ID: 10357864
Butenafine + 5% TTO cream cured toenail fungal cases (confounded by butenafine) → possible adjunct nail benefit.
- Tea tree oil in the treatment of tinea pedis
PubMed ID: 1303075
10% TTO cream improved tinea pedis symptoms; limited mycological cure so modest nail/foot fungal benefit.
- Comparison of two topical preparations for the treatment of onychomycosis: Melaleuca alternifolia (tea tree) oil and clotrimazole
PubMed ID: 8195735
Double-blind RCT: topical 100% TTO produced similar clinical improvement to clotrimazole for toenail fungus (modest culture cure).
Skin repair (2)
- Effect of Tea Tree Oil and Coconut Oil on Nipple Crack Formation in the Early Postpartum Period
PubMed ID: 36763614
TTO applied to nipples reduced cracks and pain postpartum, indicating utility in minor topical wound/skin break care.
- A randomized, controlled trial of tea tree topical preparations versus a standard topical regimen for the clearance of MRSA colonization
PubMed ID: 15066738
Tea tree regimens cleared superficial skin MRSA sites better than some comparators → potential minor antiseptic/first-aid use.
Similar by evidence
Supplements the same benefits carry qualifying findings for — a fact about the evidence graph, not a recommendation to swap.
Products with Tea Tree Oil
Search all5 products whose verified label declares Tea Tree Oil — not every bottle that mentions it in a title.
Being studied right now
Recruiting clinical trials registered on ClinicalTrials.gov. A trial in progress has no result yet — this is what the field is asking, not what it found.