Clinical Context
Diabetic foot ulcers (DFUs) represent one of the most feared complications of diabetes, affecting up to 25% of patients during their lifetime and accounting for the majority of non-traumatic lower extremity amputations. Standard wound care—debridement, offloading, moisture management, and infection control—achieves complete healing in only 30-50% of cases. The persistent search for adjunctive therapies that can accelerate healing has led to exploration of numerous topical agents, including growth factors, bioengineered skin substitutes, and complementary therapies.
Ozone (O₃) is a highly reactive form of oxygen with documented antimicrobial, anti-inflammatory, and tissue-healing properties. Ozone therapy has been used in medicine since the early 20th century, with applications ranging from water purification to wound treatment. However, gaseous ozone is unstable and difficult to apply topically. Ozonated oils—prepared by bubbling ozone through olive oil or other carriers—provide a stable, easy-to-apply formulation that releases ozone slowly at the wound surface.
The proposed mechanisms of ozonated oil in wound healing are multifold: direct antimicrobial action against bacteria (including antibiotic-resistant strains), enhanced oxygen delivery to hypoxic wound beds, stimulation of growth factors and cytokines that promote tissue regeneration, and modulation of inflammation. This randomized controlled trial tested whether ozonated olive oil could improve DFU healing beyond standard care.
Study Summary (PICO Framework)
Summary:
In adults with type 2 diabetes and Wagner grade 1-2 diabetic foot ulcers, daily topical ozonated olive oil for 4 weeks significantly improved wound healing, quality of life, glycemic control, and reduced inflammation compared to standard wound care alone, with no reported adverse effects.
| PICO | Description |
|---|---|
| Population | Adults 18-75 years with T2DM and Wagner grade 1-2 DFUs at a tertiary care center. |
| Intervention | Daily topical ozonated olive oil (50 g/m³ concentration, 5 mL) for 4 weeks. |
| Comparison | Standard DFU care (debridement, dressings, offloading) without ozonated oil. |
| Outcome | Improved wound healing (BWAT scores), better diabetes QoL, lower HbA1c (7.1% vs 7.7%), reduced hs-CRP (2.9 vs 3.6 mg/L). No adverse effects. |
Clinical Pearls
1. Wound healing improvements were objectively measured. The study used the Bates-Jensen Wound Assessment Tool (BWAT), a validated 13-item scale that evaluates wound characteristics including size, depth, edges, undermining, necrotic tissue, exudate, and surrounding skin. This objective assessment goes beyond simple wound area measurement to capture overall wound bed quality. Significant BWAT score reduction indicates not just smaller wounds but healthier healing trajectories.
2. The glycemic improvement is intriguing and may reflect reduced infection burden. The ozonated oil group achieved lower HbA1c (7.1% vs 7.7%, p=0.005), fasting glucose, and postprandial glucose compared to standard care. This wasn’t a diabetes drug—it was topical wound therapy. The likely explanation: chronic wounds harbor bacterial biofilms that drive persistent inflammation, which worsens insulin resistance. By accelerating wound healing and reducing wound-related inflammation (evidenced by lower hs-CRP), ozonated oil may have indirectly improved systemic metabolic control.
3. The anti-inflammatory effect was selective. hs-CRP (a general inflammation marker) decreased significantly, but IL-6 and TNF-α (more specific inflammatory cytokines) didn’t change significantly. This pattern might reflect that hs-CRP is a more sensitive marker of low-grade inflammation, or that ozone’s effects are primarily local rather than systemic. The reduction in hs-CRP nonetheless suggests a meaningful anti-inflammatory contribution.
4. Patient-reported quality of life improved. Beyond wound metrics and biomarkers, patients using ozonated oil reported better diabetes-related quality of life. Living with a chronic wound profoundly impacts daily life—mobility limitations, dressing changes, clinic visits, amputation fears. Therapies that accelerate healing improve quality of life in ways that transcend clinical measurements.
Practical Application
Patient selection for ozonated oil: Based on this trial, consider ozonated olive oil for patients with Wagner grade 1-2 DFUs (superficial ulcers not extending to bone) who are receiving appropriate standard care but not progressing adequately. The intervention is low-risk and may complement existing therapy. It’s not appropriate as a substitute for standard care components (debridement, offloading, infection treatment, vascular assessment).
Product considerations: The study used ozonated olive oil at 50 g/m³ ozone concentration, applied as 5 mL daily. Commercial ozonated oil products vary in concentration and quality. Look for products from reputable manufacturers with documented ozone content. Medical-grade ozonated oils are preferable to cosmetic products. The olive oil carrier is well-tolerated on wounds and provides additional moisture and barrier function.
Application technique: Clean the wound according to standard protocols (saline irrigation, gentle debridement if needed). Apply a thin layer of ozonated oil to cover the wound bed completely. Cover with an appropriate secondary dressing. Daily application was used in this trial. The 4-week treatment duration provides a reasonable trial period to assess response.
Integration with standard care: Ozonated oil should augment, not replace, evidence-based DFU management: adequate offloading (total contact cast, removable cast walker, or therapeutic footwear), sharp debridement of non-viable tissue, appropriate moisture management, infection treatment when present, glycemic optimization, and vascular assessment with revascularization if indicated. Consider ozonated oil as one tool in a comprehensive wound care protocol.
How This Study Fits Into the Broader Evidence
Ozone therapy for wound healing has been studied for decades, but high-quality RCT evidence has been limited. A 2019 systematic review found that ozone therapy (various forms) showed promise for diabetic wounds, but called for more rigorous trials. This RCT adds quality evidence supporting topical ozonated oil specifically.
The mechanism of ozone in wound healing involves multiple pathways. Ozone’s antimicrobial effects may help control wound bioburden, including biofilm-forming bacteria. Ozone improves tissue oxygenation—critical in the hypoxic diabetic wound environment. Ozone also stimulates antioxidant enzyme systems (paradoxically, as ozone itself is an oxidant) and may enhance growth factor expression.
Other adjunctive DFU therapies with evidence include hyperbaric oxygen therapy (improves oxygenation), becaplermin gel (recombinant PDGF), bioengineered skin substitutes, and negative pressure wound therapy. Ozonated oil offers a simpler, less expensive option that might be used earlier in the treatment algorithm or in resource-limited settings.
Limitations to Consider
Sample size is not specified in the available summary; typical RCTs of this nature are often modest (30-100 participants). The 4-week duration is relatively short for DFU healing, which often requires 12+ weeks. Wagner grade 1-2 ulcers are less severe—results may not apply to deeper ulcers. Single-center design limits generalizability. Long-term outcomes (complete healing, recurrence, amputation) aren’t reported. The mechanism by which topical wound therapy improved systemic glycemic control warrants further investigation.
Bottom Line
In this RCT, daily topical ozonated olive oil for 4 weeks improved diabetic foot ulcer healing, quality of life, glycemic control, and inflammation markers compared to standard wound care alone, with no reported adverse effects. Ozonated oil represents a low-risk, potentially beneficial adjunct for Wagner grade 1-2 DFUs that can complement standard wound care protocols. The observation that topical wound therapy improved systemic metabolic parameters underscores the intimate connection between chronic wounds and overall metabolic health in diabetes.
Source: Solmaz Vahedi, et al. “Effects of topical ozonated olive oil on lipid profile, quality of life, wound healing and glycemic control in patients with diabetic foot ulcers: a randomized controlled trial.” Read article here.
