Black Mulberry and Mouth Sores: Does It Really Help?
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In everyday language, “mouth sores” means lesions inside the lips, on the tongue, cheek lining or palate, often painful and associated with white-red discoloration.
Their main medical categories include:
- Aphthous ulcers (canker sores)
- Traumatic lesions (cheek biting, vigorous brushing, denture trauma, etc.)
- Ulcers associated with medications or systemic diseases
- Oral mucositis caused by chemotherapy and/or radiotherapy
The condition seen particularly in patients receiving cancer treatment is called oral mucositis . Redness and edema, followed by superficial or deep ulceration, may cause severe pain, difficulty eating/drinking, infection risk, weight loss and even treatment dose reductions or delays.
Many patients and healthcare professionals therefore explore “natural and supportive” agents alongside standard oral care. Black mulberry (Morus nigra) is a fruit with both traditional uses and, in recent years, clinical research in this area.
Black mulberry has long been used, particularly in Anatolia, the Mediterranean and the Middle East, for mouth sores, sore throat, gum problems and some skin rashes, traditionally as a medicinal fruit.
Phytochemically, black mulberry contains:
- Anthocyanins (pigments giving its black-purple color),
- Flavonoids (rutin, quercetin, etc.),
- Phenolic acids,
- Organic acids (citric, malic acid),
- Vitamin C and other antioxidant compounds
, among many bioactive molecules. Laboratory studies report antioxidant, anti-inflammatory, antimicrobial and tissue-healing effects. This biological profile makes black mulberry a rational candidate for oral mucosal injuries.
Much of the available evidence comes from animal experiments and small clinical studies. Potential mechanisms can be summarized as follows:
- Antioxidant effects
Chemotherapy and radiotherapy are associated with increased oxidative stress in the oral mucosa. In experimental 5-FU (5-fluorouracil) mucositis models, black mulberry extracts have reduced oxidative stress markers and supported histological mucosal integrity. - Anti-inflammatory effects
Inflammatory cytokines such as TNF-α, IL-1β and IL-6 contribute to oral mucositis. Morus nigra preparations have reportedly reduced these cytokine levels and inflammation scores in various models. - Antimicrobial properties
Higher bacterial and fungal loads in mouth sores are associated with pain, bad odor and delayed healing. Evidence suggests black mulberry extracts may have inhibitory effects against certain oral pathogens. - Accelerating tissue healing
Animal studies report faster mucosal epithelial regeneration, smaller ulcer areas and better histological healing scores in black mulberry-treated groups.
1. Black Mulberry Molasses During Head-Neck Radiotherapy
In a randomized controlled trial in patients receiving head-neck cancer radiotherapy, those adding black mulberry molasses mouth rinses to standard oral care had:
- Oral mucositis incidence and severity lower than the comparison group,
- Reduced Grade 3–4 (severe) mucositis rates,
- Less pain and swallowing difficulty
. This was a pioneering study demonstrating a preventive effect against radiotherapy-induced mucositis.
2. Oral Care with Black Mulberry Extract During Chemotherapy
Patients receiving chemotherapy for different cancers were assigned a black mulberry extract oral care protocol or sodium bicarbonate solution. The mulberry group showed:
- Lower oral mucositis incidence and severity,
- Better dry mouth and pain scores,
- Less weight loss in some patients
.
3. Black Mulberry Mouthwash in 5-FU-Based Chemotherapy
In a double-blind randomized study of patients receiving 5-FU-based chemotherapy for colon adenocarcinoma, black mulberry mouthwash users had:
- Significantly lower oral mucositis incidence and severity,
- Improved pain and quality-of-life scores,
- No reported serious safety issues.
4. A Noncancer Example: Black Mulberry Syrup in COPD
In a study of COPD patients with oral mucositis, those who rinsed with and swallowed black mulberry syrup showed:
- Faster reductions in mucositis scores,
- Healing shortened by several days,
- Substantially reduced pain and discomfort
. This noncancer study also suggests black mulberry may have a general mucosal repair effect .
5. Findings from a Systematic Review
A systematic review published in 2024–2025 combined black mulberry and other mulberry formulations used for chemotherapy- and/or radiotherapy-related oral mucositis. Overall, studies reported:
- Mucositis incidence and severity reductions,
- Less pain and dry mouth,
- Beneficial effects on nutrition and weight loss
; serious adverse event rates were low.
1. Scientific Strengths
- Several randomized controlled trials and pilot studies provide supportive efficacy signals.
- Beyond clinical scores, patients report improvements in pain, dry mouth and quality of life .
- Serious adverse effect rates reported in studies are low; the safety profile generally appears good .
- Its cultural familiarity and accessibility may improve adherence.
2. Limitations and Precautions
- The number of studies remains limited, with relatively small patient populations.
- Forms and doses are highly heterogeneous (molasses, syrup, extract, mouthwash, etc.).
- Long-term safety and standardization data are lacking.
- In international guidelines, black mulberry is not yet included as “standard treatment”; it remains a complementary approach.
1. When Might Black Mulberry Be Considered?
With medical approval, it may be considered for:
- Patients receiving head-neck radiotherapy,
- Patients receiving mucositis-causing chemotherapy such as 5-FU,
- Those with previous oral mucositis and a high recurrence risk,
- Those seeking additional support while following standard oral care (soft toothbrush, saline-baking soda rinses, etc.).
2. How Is It Used in Clinical Studies?
Although protocols vary, two common approaches stand out:
- Rinsing with black mulberry molasses/syrup: A small amount is rinsed in the mouth for 30–60 seconds, then spat out in some studies and swallowed in others.
- Black mulberry mouthwash or prepared solution: Products with standardized extract are incorporated into oral care several times daily.
Frequency is generally 3–4 times a day throughout radiotherapy/chemotherapy and during recovery. Doses are difficult to standardize in homemade mixtures; planning with the physician and, when needed, a dentist is therefore advisable.
3. Which Patient Groups Need Extra Caution?
- People with diabetes: Molasses and syrups contain substantial sugar and may disrupt blood glucose control.
- People with chronic liver or kidney failure: Consult the relevant specialist before using any herbal product.
- People allergic to mulberries or pollen: Review allergy risk before use.
- Children, pregnant or breastfeeding people: Controlled clinical data are very limited in these groups; avoid arbitrary or high-dose use.
Black mulberry (Morus nigra) has moved beyond a traditional mouth sore “remedy” and, in recent years, become a clinically investigated phytotherapeutic agent for chemotherapy- and radiotherapy-induced oral mucositis .
Available studies indicate that molasses, syrups or rinses containing black mulberry may:
- Reduce mucositis incidence and severity,
- Relieve patient-important symptoms such as pain and dry mouth,
- Improve quality of life and nutritional status
. However, study and patient numbers remain relatively small, and doses and formulations vary. It is therefore more realistic to describe black mulberry as evidence-based complementary support that may be added to standard oral care and mucositis management protocols .
The most appropriate clinical approach is to evaluate black mulberry use in light of individual risks, comorbidities and treatment regimenstogether with the treating team.
- Sindhe JR, et al. A Systematic Review of the Efficacy and Safety of Mulberry Formulations for Chemotherapy- and/or Radiotherapy-Induced Oral Mucositis. Cureus. 2024.
- Demir Doğan M, Can G, Meral R. Effectiveness of Black Mulberry Molasses in Prevention of Radiotherapy-Induced Oral Mucositis in Head and Neck Cancer Patients: A Randomized Controlled Study. J Altern Complement Med. 2017;23(12):971–979.
- Karabey T, et al. The Effect of Oral Care With Black Mulberry Extract on Oral Mucositis, Dry Mouth, and Weight Change in Patients With Cancer. Randomized clinical trial, 2022.
- Ghorbani A, et al. Efficacy of Black Mulberry Mouthwash for Prevention of Chemotherapy-Induced Oral Mucositis: A Double-Blind Randomized Clinical Trial. Front Dent. 2025.
- Korkut S, et al. The Effect of Oral Care With Black Mulberry Syrup on Oral Mucositis in Patients With COPD: A Mixed Study. 2023.
- Yiğitaslan S, et al. Therapeutic Potential of Morus nigra on 5-Fluorouracil-Induced Gastrointestinal Mucositis in Rats. Osmangazi Tıp Dergisi. 2020.
- Lim SH, et al. Pharmacological Properties of Morus nigra L. (Black Mulberry). Nutrients. 2019;11(2):437.
- Çelik Y. Karadut (Morus nigra) içeriği ve oral mukozit üzerine etkileri. Review, 2023.
- Pourabbasi M, et al. Black Mulberry and Its Therapeutic Effects in Traditional Iranian Medicine and Modern Research. 2024.
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