What Is Onion Ointment and What Does It Treat?
Onion ointment, often made from Allium cepa extracts, is a topical supplement used for skin issues like scars, wounds, keloids, and minor burns. It contains quercetin and sulfur compounds thought to reduce inflammation and promote healing. Products like Mederma or homemade versions claim to soften scar tissue over time.
How Long Until You See Results?
Expect visible changes in 4-8 weeks with twice-daily use. Early softening may start in 2-4 weeks, but full fading of scars or wounds can take 3-6 months. Studies on onion extract gel show 60-80% improvement in scar height and redness after 4 months, but results vary by scar age and size—newer scars respond faster.[1][2]
Factors Affecting Speed
- Scar or wound type: Fresh wounds heal in 2-4 weeks; old keloids may need 6+ months or no response.
- Application consistency: Apply thinly 2-3 times daily on clean skin; combine with silicone sheets for better results.
- Skin type and location: Face scars improve quicker than body ones due to better blood flow.
- Age and health: Younger skin or no smoking speeds healing.
Evidence from Studies
A 2018 review of 9 trials found onion extract superior to placebo for scar pliability after 3-6 months, but not always for color or height.[3] Another study on postoperative scars noted reductions in 8 weeks.[4] No large RCTs confirm faster action; effects are modest compared to laser therapy.
Compared to Other Scar Treatments
| Treatment | Time to Noticeable Results | Strength of Evidence |
|-----------|----------------------------|----------------------|
| Onion ointment | 4-8 weeks | Moderate (small studies) |
| Silicone gel/sheets | 4-12 weeks | Strong |
| Vitamin E cream | 4-6 weeks | Weak/mixed |
| Corticosteroid injections | 2-4 weeks | Strong for keloids |
| Laser therapy | 1-3 sessions (weeks) | Strong |
Onion is cheaper but slower/less effective than medical options for severe cases.
Common Side Effects and When to Stop
Mild redness or itching in 5-10% of users, resolving quickly. Stop if infection signs appear. Not for open wounds—wait until closed.
Realistic Expectations for Supplements
Onion ointment isn't a quick fix; it's adjunctive. For stubborn scars, see a dermatologist. Track progress with photos every 2 weeks.
Sources
[1] Post et al., Onion extract gel effective for scar improvement (Burns, 2007)
[2] Ghaffari et al., Allium cepa review (Phytother Res, 2018)
[3] Walraven et al., Meta-analysis on onion extract (J Plast Reconstr Aesthet Surg, 2018)
[4] Hosnuter et al., Postoperative scars (Dermatol Surg, 2013)