Anemia

Acemannan, a polysaccharide extracted from Aloe vera, has been studied in randomized controlled trials for recurrent aphthous stomatitis (RAS). In an RCT by Bhalang et al. (2013, J Altern Complement Med), acemannan demonstrated significant pain relief and ulcer reduction compared to placebo, though corticosteroids remained more effective. Its mechanisms include immunomodulation, promotion of fibroblast proliferation, and stimulation of keratinocyte growth factors that facilitate mucosal healing.

Aloe Vera gel has been evaluated in multiple randomized controlled trials for recurrent aphthous stomatitis (RAS). In a landmark double-blind RCT (Mansour et al., J Oral Pathol Med 2014), a 0.5% aloe vera mucoadhesive gel produced complete ulcer healing in 76.6% of patients and subsidence of erythema in 86.7% by day 6. A 2024 systematic review and meta-analysis of RCTs confirmed that aloe vera significantly reduces pain and promotes healing in oral ulcers.

Bee propolis, a resinous substance produced by bees with anti-inflammatory, antioxidant, and immunomodulatory properties, has been evaluated in a 2024 systematic review and meta-analysis (PubMed PMID 38248221) specifically for recurrent aphthous stomatitis. Multiple RCTs included in this review found propolis reduced healing time, pain, and recurrence of aphthous ulcers. A randomized clinical trial also directly compared propolis versus silver nitrate and other treatments for canker sores, showing significant efficacy.

Chamomile (Matricaria chamomilla/recutita) mouthwash has been evaluated in a triple-blind, randomized clinical trial (Seyyedi et al., J Clin Exp Dent 2014;6:e535–538; 36 RAS patients) and found effective in controlling RAS pain and burning sensation without adverse effects. Active constituents including azulene, chamazulene, and flavonoids provide anti-inflammatory and analgesic effects. Chamomile was also independently assessed in a registered Phase 1 RCT (ClinicalTrials.gov NCT01122147) for aphthous stomatitis.

Myrrh gel has been evaluated in a clinical trial against canker sores (aphthous ulcers), demonstrating significant pain reduction compared to placebo and aloe vera gel. Commission E and ESCOP both formally endorse topical myrrh for aphthous ulcers and oral mucosal inflammation.

Curcumin has been evaluated in multiple RCTs and two systematic reviews for recurrent aphthous stomatitis (RAS). A 2020 systematic review (PubMed PMID 32893718) found curcumin has potential benefits in alleviating pain and accelerating healing in RAS, based on 8 included studies (n=439 subjects). A 2021 systematic review (PMID 34331693) further confirmed curcumin's anti-inflammatory and antibacterial role in oral disease treatment. Formulations studied include 1% curcumin nanomicelle gel and 2% plant-based curcumin gel.

Echinacea has been studied in a clinical trial (PMC6131317) for recurrent minor oral aphthous ulcers, showing a positive effect on ulcer healing and reduction in recurrence. Historically used by Native Americans from the 17th century onward for gum and mouth diseases, its immunomodulatory and anti-inflammatory properties are attributed to polysaccharides, caffeic acid derivatives, and chicoric acid. EBSCO Research and clinical literature cite it as showing effectiveness for RAS.

Echinacea purpurea specifically has been studied in the context of oral aphthous ulcers for its immunomodulatory and anti-inflammatory properties. A clinical trial (PMC6131317) using echinacea tablets in 50 patients with recurrent minor oral aphthous ulcers found positive effects on healing and reduction in recurrence. Its polysaccharides and caffeic acid derivatives are proposed as the primary active agents reinforcing immune function in RAS.

Folic acid (vitamin B9) deficiency is associated with recurrent aphthous stomatitis (RAS), with multiple observational studies finding lower dietary folate intake in RAS patients compared to controls. StatPearls (NCBI Bookshelf) confirms hematinic deficiencies including folic acid occur twice as often in RAS patients. Supplementation with folic acid has been shown in small clinical trials and prescribed clinically to reduce frequency and severity of canker sores, particularly in deficient individuals.

Glycyrrhizin, the primary bioactive triterpenoid glycoside of licorice root (Glycyrrhiza glabra), has been identified as the key anti-inflammatory component responsible for licorice's documented efficacy in recurrent aphthous stomatitis. A systematic review (PMC10541548) confirmed glycyrrhizin-based topical licorice preparations reduce RAS healing time, pain, and inflammation within 4–8 days. Its structure is similar to adrenal steroids, producing corticosteroid-like anti-inflammatory effects relevant to aphthous ulcer suppression.

Honey has been evaluated in RCTs for recurrent aphthous stomatitis. A randomized, blind, double-center clinical trial (Quintessence International, 2014) comparing honey to topical corticosteroid found honey effective in reducing pain, ulcer size, and erythema in a Saudi cohort with minor aphthous ulcers. A PMC-indexed biochemical evaluation study and a separate RCT (vs. steroid gel and OTC paste) further support honey's efficacy, attributed to its antimicrobial, osmotic, and anti-inflammatory properties.

Hyaluronic acid (HA) has been evaluated in multiple clinical studies and a systematic review for recurrent aphthous stomatitis. A 2021 systematic review in Clinical Oral Investigations confirmed HA's efficacy in managing RAS signs and symptoms via its barrier-forming, anti-inflammatory, and wound-healing properties. A retrospective clinical study (BMC Oral Health 2019; PMC6636158) found both HA mouth rinse and HA gel effective for minor RAS with improved healing onset.

Iron deficiency is documented as a risk factor for recurrent aphthous stomatitis (RAS), with hematinic (iron, folic acid, vitamin B12) deficiencies occurring twice as often in RAS patients as in the general population per StatPearls (NCBI Bookshelf). Correcting iron deficiency through supplementation has been associated with reduction in canker sore frequency. Iron is routinely prescribed alongside other hematinics (B12, folate, zinc) for RAS patients with documented deficiency.

A double-blind, placebo-controlled RCT of 30 patients with recurrent aphthous stomatitis (RAS) found that L. brevis CD2 lozenges (4x daily, 7 days, ≥10^9 CFU/lozenge) produced complete remission in 93.3% of treated patients vs. 46.6% in the placebo group. A systematic review and meta-analysis confirmed L. brevis CD2 and Bacillus clausii showed excellent capacity for promoting ulcer healing and reducing oral pain. The mechanism involves arginine deiminase-mediated reduction of pro-inflammatory cytokines.

Licorice root (Glycyrrhiza glabra) has been evaluated in a dedicated systematic review of clinical trials (PMC10541548; PubMed PMID 37786470) for recurrent aphthous stomatitis, finding that topical licorice significantly reduces healing time, pain, and inflammation zone size within 4–8 days of treatment. An RCT (n=70 patients) found licorice plus diphenhydramine solution healed aphthous ulcers faster than diphenhydramine alone. A double-blind RCT of a dissolving glycyrrhiza oral patch also demonstrated efficacy for RAS.

Myrrh (Commiphora molmol) has been evaluated in a double-blind, randomized, placebo-controlled RCT (Mansour et al., J Oral Pathol Med 2014;43:405–409; n=90 RAS patients) as a 0.5% mucoadhesive gel. The myrrh-treated group showed almost complete absence of pain in 76.7% of patients by day 6. InformedHealth.org (NCBI Bookshelf) lists myrrh tinctures as astringent agents that narrow blood vessels in the mucous membranes to relieve canker sore pain.

Rhubarb root extract was directly compared against placebo, propolis, and silver nitrate in a randomized clinical trial (ScienceDirect; 125 RAS patients; Tetuan, Morocco; CONSORT guidelines) for treatment of recurrent aphthous stomatitis. The rhubarb extract group showed statistically significant (p<0.001) faster symptom resolution compared to placebo. InformedHealth.org (NCBI Bookshelf) also cites rhubarb root tinctures as astringent agents used to relieve canker sore pain.

Sage (Salvia officinalis) mouthwash has been documented in clinical literature as an effective herbal treatment for recurrent aphthous stomatitis. A PMC-indexed clinical study (PMC6131317) lists sage mouthwash among medicinal plants used for aphthous treatment. The EBSCO Research Starters database and clinical review literature cite sage as among the herbal treatments showing effectiveness for RAS, attributed to its anti-inflammatory, astringent, and antimicrobial properties.

A PMC case report and several observational accounts describe Triphala oral rinse as effective for reducing pain, burning, and size of minor aphthous ulcers (canker sores). Its anti-inflammatory and antibacterial properties provide mechanistic support. Clinical trial evidence remains at the case report/observational level.

Vitamin B12 is among the most evidence-supported supplements for recurrent aphthous stomatitis (RAS). A landmark double-blind, placebo-controlled RCT (PMID 20023621; n=58 RAS patients) found vitamin B12 supplementation significantly reduced ulcer duration, number, and pain at 5–6 months, with 74.1% of treated patients achieving 'no aphthous ulcer status' vs. 32.0% in placebo. A separate RCT (PMID 26025792) confirmed analgesic benefit of topical vitamin B12 ointment in aphthous ulcers.

Riboflavin deficiency is closely associated with inflammation of the oral mucosa, and recurrent aphthous stomatitis (canker sores) has been linked to low B-vitamin status including B2. A 1991 clinical study found riboflavin deficiency in patients with recurrent aphthous ulceration, with response to B-vitamin replacement. Riboflavin is a component of vitamin B complex formulations used in the clinical management of mouth ulcers.

Vitamin B6 (pyridoxine) is included alongside vitamin B12 and folate in clinical prescriptions for canker sore management, particularly when nutritional deficiency is involved. It is specifically listed in clinical guidelines and authoritative sources as one of the B-vitamins prescribed for RAS, and a patent on treating aphthous ulcers (USPTO 8586537) documents combined vitamin B12 and B6 protocols. Multiple authoritative sources confirm vitamin B6 deficiency as a predisposing factor for RAS.

Folate (vitamin B9) deficiency is associated with recurrent aphthous stomatitis (RAS). A controlled dietary study (PMC3323114; n=100 RAS patients) found significantly reduced dietary folate intake in RAS patients versus matched controls. StatPearls (NCBI Bookshelf) and EBSCO Research Starters confirm folate as one of the hematinic supplements prescribed for RAS. Supplementation may reduce canker sore frequency and severity, particularly in deficient individuals.

Zinc supplementation is supported by a 2021 systematic review (PubMed PMID 34146924; 7 clinical trials, n=482 RAS patients) in which 5 of 7 trials showed significantly better efficacy of zinc in reducing RAS recurrence rates versus controls. A double-blind RCT (PMC7385976; n=46 RAS patients) of topical zinc sulfate mucoadhesive tablets found significant reductions in lesion diameter (days 3, 5, 7; p=0.001) and pain (from day 4; p=0.001) versus placebo.

Indigo Naturalis (Qingdai), derived primarily from S. cusia, has a well-documented traditional use for aphtha (oral ulcers/canker sores) extending back ~1,400 years in Chinese medicine. Qingdai was also historically recorded for treating dental ulcers in folk practice, and one reported use cites Qingdai for 'dental ulcers' in the modern literature.

Bayberry tea used internally and as a rinse was traditionally recommended for canker sores of the mouth and throat. This use appears in 19th-century herbal texts, most notably Jethro Kloss's Back to Eden. The astringent tannins and antimicrobial myricitrin provide a plausible mechanistic basis.

Black walnut hull has traditional documented use as an oral rinse or topical application for canker sores (aphthous ulcers), attributed to its astringent tannins and antimicrobial juglone. There are no clinical trials evaluating this application. Traditional herbalism records its use to heal mouth and throat sores.

Blackberry leaf and root infusions have a documented traditional use as mouthwashes for mouth ulcers (canker sores), referenced in historical herbals and Native American medicine. The astringent tannins are considered to reduce mucosal irritation and promote healing of oral lesions.

Calendula preparations — as gargle, mouthwash or topical gel — are traditionally used for oral mucosal ulcerations including canker sores, given its EMA-recognised status for treating minor oral mucosa inflammation. Specific RCTs targeting aphthous stomatitis with calendula monotherapy are lacking.

Clove oil is traditionally applied to canker sores (aphthous ulcers) for pain relief via eugenol's local anesthetic action. Eugenol is an FDA-approved topical dental analgesic, and this anesthetic property extends to oral mucosal ulcers, though dedicated RCTs for aphthous stomatitis are absent.

Goldenseal is traditionally applied topically to canker sores (aphthous ulcers), with berberine and astringent alkaloids attributed to anti-inflammatory and antimicrobial effects on oral mucosa. The NCCIH lists canker sores among conditions for which berberine is promoted, though no rigorous clinical trials have confirmed goldenseal's efficacy.

TCM texts and ethnobotanical records document traditional use of Lophatherum leaf for mouth ulcers, tongue sores, and buccal sores. It is listed in the Chinese Pharmacopoeia for treating 'tongue sores.' The herb is also used in classical TCM formulas targeting 'Heart Fire' canker sores on the tongue. No clinical studies specifically isolating this herb's effect on canker sores exist.

Marshmallow has been traditionally used as a gargle or oral rinse for mouth ulcers (canker sores), with the mucilage forming a protective film over irritated oral mucosa. The German Commission E approved marshmallow leaf and root for irritation of the oral and pharyngeal mucosa. No dedicated human RCTs for canker sores exist.

Plantago major extract is documented in a study as effective for diminishing the severity of oral mucositis. Commission E and ESCOP list P. lanceolata for inflammatory changes of the mucous membranes of the mouth. Traditional and empirical use for aphthous ulcers and oral lesions is well-documented.

Raspberry leaf infusion has a documented traditional use as a mouthwash for canker sores (aphthous ulcers of the mouth) and mouth ulcers, attributed to its astringent tannin content. Multiple herbalist references record this use specifically. No clinical trials have evaluated raspberry leaf for aphthous ulcer outcomes.

Ceanothus americanus has a specific, repeatedly cited traditional use as a topical wash or gargle for canker sores (oral aphthous ulcers) and inflamed oral mucosa associated with fever. This is documented in Eclectic materia medica and early American herbal sources. The astringent tannin content provides a plausible mechanism, but no clinical trials exist.

Slippery elm has traditionally been used as a soothing agent for oral mucosal irritation including canker sores. The mucilage is believed to coat and protect ulcerated mucous membranes in the mouth. No human clinical trials specifically address this indication.

Oak bark has traditional use as an oral rinse or gargle for canker sores (aphthous ulcers), leveraging its astringent and antimicrobial tannins. Germany's Commission E lists mouth and throat inflammation, including mouth sores, as an approved topical indication. No human clinical trials specifically for canker sores have been conducted.

Yellow Root has been traditionally used as a mouthwash and rinse for mouth sores including canker sores (aphthous ulcers), and this is one of its most consistently recorded folk uses. The astringent and antimicrobial properties of berberine provide plausibility. No specific clinical trials on Yellow Root for canker sores have been identified.