Vitamin C, Vitamin E, and Ferulic Acid After Acne Scar Laser in 2026: Sample Size and Evidence Limits for People With Atrophic Acne Scars

Early 2026 evidence is small but direct: 64 Chinese adults with moderate-to-severe atrophic acne scars completed 14 days of vitamin C, vitamin E and ferulic acid versus saline after ablative fractional CO2 laser. The once-daily and twice-daily split-face design showed faster healing, but its single-center size limits wider use. Atrophic acne scars are depressed pits left when inflamed acne breaks down collagen. For people weighing laser, the trial points to supervised recovery care, not home treatment of fresh laser wounds.

Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.

What did the 2026 laser trial test?
How small was the sample?
What improved in the first week?
Why do limits matter for atrophic scars?
What should you ask before CO2 laser?

What did the 2026 laser trial test?

PubMed Central/Wiley published the January 2026 randomized, investigator-blinded split-face trial the trial report. It enrolled Chinese adults aged 18-50 with moderate-to-severe atrophic scars. Each person received ablative fractional CO2 laser, then antioxidant serum on one face side and saline on the other.

Care lasted 14 days. Patients were split 1:1 into once-daily and twice-daily groups. The design compares healing on two sides of the same face, which controls for age, skin type, and laser dose.

How small was the sample?

The team recruited 66 patients to allow for dropouts, and 64 stayed in the final analysis. That split leaves about 32 people per dosing schedule. Such numbers can show a short-term signal but cannot map dose response well.

Small single-center trials also narrow who was studied. Results from adults in one Chinese center do not automatically fit teens, older adults, other ancestries, or other laser settings. Wider clinics and longer follow-up would be needed for that step.

What improved in the first week?

HCPLive, reporting Shi and colleagues, noted more complete scab detachment at day 7 on the treated side HCPLive treatment summary. Faster scab loss means the laser wound closed sooner. Closure matters because open wounds raise infection, redness, and pigment risk.

PubMed records lower erythema and melanin readings plus better hydration and barrier function with the serum the PubMed record. Less redness eases the early post-laser look. Lower melanin readings and steady hydration point toward less pigment shift during healing.

Why do limits matter for atrophic scars?

Ablative fractional laser can improve moderate-to-severe atrophic scars by 51%-70%, Life/Mahidol University reviewers reported in September 2025. The same review flags prolonged redness, slow recovery, and post-inflammatory darkening, especially in Asian and Fitzpatrick III-V skin. Better aftercare would help most where risk is highest.

Earlier support is also narrow. A 2015 split-face trial in 15 healthy adults aged 30-55 found less erythema on days 3 and 5 and more basic fibroblast growth factor at day 5. Lab work on 15% L-ascorbic acid with 1% alpha-tocopherol plus ferulic acid showed stronger sunburn protection. Small groups and lab measures do not equal scar repair for most patients.

What should you ask before CO2 laser?

Do not apply strong acids or antioxidants to freshly lasered skin on your own. Laser creates open channels, so timing, dose, and skin checks need direct supervision. Strict sun protection is central while redness and pigment risk stay high.

Ask if supervised repair care fits your scar type and skin tone
Ask how often visits, washing, moisture, and sunscreen apply in week one
Ask what redness, swelling, pain, pus, or darkening should prompt a call
Bring your full product list, plus pigment and keloid history