# A-16 — Benzoyl Peroxide

An acne treatment and antibiotic-regimen partner that also appears in a distinct approved rosacea formulation. Concentration alone cannot make different vehicles and indications interchangeable.

- **Canonical:** https://www.30plusskin.care/actives/benzoyl-peroxide
- **Site:** 30+/SKIN — Skincare, published as a spec sheet.
- **Issue:** ISSUE NO. 13 / REV. 2026.10
- **Standing terms:** INDEPENDENT · AFFILIATE-FUNDED · NOT MEDICAL ADVICE

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## Datasheet

- **INN / INCI:** Benzoyl peroxide
- **Family:** Organic peroxide — oxidising antimicrobial
- **Molecular weight:** 242.23 g/mol
- **Layer reached:** EPIDERMIS
- **Prescription only:** no
- **Evidence grade:** A
- **Controlled trials on file:** 1
- **Strength range recorded:** 2.5%–10%
- **Representative reference concentration:** 5%
- **Irritation (0–10):** 2
- **Onset:** 4–12 WK
- **Stability:** OXIDISER — AIRLESS PUMP; BLEACHES FABRIC

## Mechanism

The concentration marker is not a recommended dose or a claim that other strengths are untested. Compare the vehicle, indication and trial population.

An oxidising agent with bactericidal and keratolytic effects. It does not select for bacterial resistance, which is why it is conventionally paired with topical antibiotics. The label of the approved rosacea product states that the precise mechanism in rosacea is unknown.

## Measured endpoints

| Endpoint | Effect vs comparator | Window | Record |
| --- | --- | --- | --- |
| IGA treatment success, rosacea | +26.7% | 12 WK | REF-27 — Epsolay — trial 1 (NCT03448939), papulopustular rosacea (Multicentre randomised, vehicle-controlled; treatment difference 26.7% (95% CI 16.7–36.8); mean subject age 51, n=361, grade A) |

## Layering

- **Do not layer with:** Fabric — bleaching can occur, Separate tretinoin products — ask about formulation and timing, Prior serious benzoyl-peroxide allergy
- **Pairs with:** Topical antibiotics, to limit resistance, Retinoids, at a different time of day

## Notes

- An approved acne combination and an encapsulated rosacea product have different indications and evidence records.
- AAD acne guidance recommends benzoyl peroxide alongside topical or oral antibiotics to reduce resistance.
- TWYNEO is a defined tretinoin/benzoyl-peroxide cream; its compatibility is not permission to mix arbitrary products.
- Ask about ingredient duplication before adding another acne wash or leave-on treatment to a fixed combination.

## Look at the entire antibiotic regimen

If a compounded acne prescription includes clindamycin, ask the clinician how benzoyl peroxide and the antibiotic's duration are handled. The absence of benzoyl peroxide from one bottle does not establish that it is absent from the treatment plan. Its inclusion also does not remove the need for reassessment.

## The finish and indication remain specific

CABTREO and TWYNEO offer defined acne combinations. The existing EPSOLAY review concerns rosacea. Do not compare their trial success rates as though all participants had the same condition, or replace one vehicle with another solely because the active name matches.

## A finished combination is not a mixing instruction

Ask about the actual prescribed products and whether a separate cleanser or active duplicates a component. The clinical plan should identify the application area, timing and response to irritation. Our product reviews assess public documentation, without personal tolerance testing.

## Sources

- [AAD — updated acne treatment guidelines](https://www.aad.org/news/updated-guidelines-acne-management) — Guideline summary recommends combining mechanisms and using benzoyl peroxide with topical or oral antibiotics to reduce resistance. Checked 13 September 2026.
- [DailyMed — CABTREO prescribing information](https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=9468da0f-9978-4c58-8135-0274c3415084) — Label revised March 2025: exact strengths, acne indication, two vehicle-controlled trials, contraindications and ten-week dispensing expiration. Checked 13 September 2026.
- [TWYNEO — current manufacturer prescribing information](https://www.twyneo.com/pdf/20250617_tywneo_pi.pdf) — February 2025 label names Mayne Pharma and a 30 g pump. Trial 1 success and difference figures in Table 4 conflict; that row is not charted here. Storage limits are product-specific. Checked 13 September 2026.

## Related records

- [R-74 Bausch Health CABTREO Gel](/reviews/cabtreo-acne-gel-review)
- [R-75 Mayne Pharma TWYNEO Cream](/reviews/twyneo-tretinoin-benzoyl-peroxide-review)
- [R-18 Curology DayPrime Rx](/reviews/curology-day-prime-review)
- [L-17 Adult acne prescription combinations: what the ingredients change](/ledger/adult-acne-prescription-combinations)

## Products in the register containing it

| No. | Product | Stance | Score | Document |
| --- | --- | --- | --- | --- |
| R-52 | Mayne Pharma Epsolay | RECOMMENDED | 81/100 | /reviews/epsolay-benzoyl-peroxide-review |
| R-74 | Bausch Health CABTREO Gel | CONDITIONAL | 95/100 | /reviews/cabtreo-acne-gel-review |
| R-75 | Mayne Pharma TWYNEO Cream | CONDITIONAL | 80/100 | /reviews/twyneo-tretinoin-benzoyl-peroxide-review |

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## Elsewhere in the register

- [Review register](/reviews)
- [Active monographs](/actives)
- [Brand register](/brands)
- [Evidence register](/evidence)
- [The ledger](/ledger)
- [How we test](/how-we-test)
- [Agent guide](/llms.txt)
- [Sitemap](/sitemap.xml)

_SOURCE-BASED ASSESSMENTS. PUBLISHER PREFERENCES ARE IDENTIFIED SEPARATELY._