What's In My Jar
Jan Marini Benzoyl Peroxide 10%
Jan Marini

Jan Marini Benzoyl Peroxide 10%

Efficacy87/100IrritancyMedium
See all ingredients

Works for

Anti-blemish
Benzoyl peroxide
Works well
What the product description says
“Jan Marini Skin Research Benzoyl Peroxide 10% strength is the medication of choice for treating acne .”
Source: Lookfantastic US

This product can help reduce breakouts and clogged pores because it contains the following ingredient: benzoyl peroxide. This ingredient is used for treating acne and can have a noticeable effect.

Benzoyl peroxideHeroEffect: HighA potent anti-bacterial ingredient that is effective against acne. Often leads to skin dryness and can be irritating10%
Moisturizing
Cetyl alcohol, Glycerin + 2 more
Works
What the product description says
“Special non-comedogenic moisturizers minimize dryness and irritation.”
Source: Lookfantastic US

This product contains good ingredients to attract water to the upper layer of the skin. These ingredients are called "humectants": glycerin, butylene glycol.

When humectants are on the surface of the skin, they “pull in” the moisture from the outside environment, or from within deeper layers of the skin. If the air is dry, humectants can speed up the moisture loss from the skin. This is why it is a good idea to use another product on top of this one to help "seal in" the moisture (look for ingredients like dimethicone, squalane, oils and butters).

Cetyl alcoholKey active· EmollientEffect: MediumA non-drying alcohol that works to soften the skin and stabilize product formulations helping oil and water mix together~4–6%
GlycerinKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant~1.5–2.3%
Glyceryl stearate· EmollientEffect: LowAn emollient that softens the skin and forms a protective layer on its surface. Helps water and oil mix together~2.6–3.9%
Butylene glycol· HumectantEffect: LowUsed to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin~0.85–1.3%

Can it cause trouble?

Irritancy
2 strong irritants: Benzoyl peroxide, Diazolidinyl urea
Medium risk
We flagged 3 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
Benzoyl peroxideA potent anti-bacterial ingredient that is effective against acne. Often leads to skin dryness and can be irritatingHigh10%
Sodium lauryl sulfateA cleansing agent (SLS). It can be irritatingHigh~11–16%est.
Diazolidinyl ureaA preservative. Works by releasing formaldehyde. Can be irritatingHigh~0.25–0.5%est.
Comedogenic
1 ingredient rated 2 or more on the 0–5 pore-clogging scale
1 flagged
These ingredients have a comedogenic rating of 2 or more on a 0–5 scale; the table shows each one's rating. In leave-on products they can clog pores in acne-prone skin.
IngredientFunctionRatingEst. amount
Sodium lauryl sulfateA cleansing agent (SLS). It can be irritating3/5~11–16%est.
Alternatives
Cheaper, or higher on efficacy
On
Neutrogena On
Higher efficacy · 100/10059% match
$10.87
Cream, 5%
EPSOLAY Cream, 5%
Higher efficacy · 100/10058% match
View all alternatives

User reviews

Would you recommend?
No community reviews yet.

Be the first — your take helps the next person decide.

Ingredients

Filter by role to see what each ingredient is doing.

Benzoyl peroxide10%
Hero · Anti-blemishIrritant · high
Irritation risk
High
Works for
Anti-blemish

A potent anti-bacterial ingredient that is effective against acne. Often leads to skin dryness and can be irritating

More about Benzoyl peroxide
Water~40–60%
Formula
Irritation risk
Low

Plain old water

More about Water
Sodium lauryl sulfate~11–16%
Comedogenic 3/5Irritant · high
Irritation risk
High
Comedogenicity
3/5
Works for
Cleansing

A cleansing agent (SLS). It can be irritating

More about Sodium lauryl sulfate
Cetyl alcohol~4–6%
Key active
Irritation risk
Low
Works for
CleansingMoisturizing

A non-drying alcohol that works to soften the skin and stabilize product formulations helping oil and water mix together

More about Cetyl alcohol
Stearyl alcohol~3.2–4.7%
Formula
Irritation risk
Low
Works for
Cleansing

An emollient that helps soften the skin

More about Stearyl alcohol
Glyceryl stearate~2.6–3.9%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

An emollient that softens the skin and forms a protective layer on its surface. Helps water and oil mix together

More about Glyceryl stearate
Glycerin~1.5–2.3%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant

More about Glycerin
Butylene glycol~0.85–1.3%
Formula
Irritation risk
Low
Works for
Moisturizing

Used to create a nice product texture and help delivery of other ingredients. Might be somewhat helpful in attracting water to the upper layer of the skin

More about Butylene glycol
Diazolidinyl urea~0.25–0.5%
Irritant · high
Irritation risk
High

A preservative. Works by releasing formaldehyde. Can be irritating

More about Diazolidinyl urea
Methylparaben~0.15–0.3%
Formula
Irritation risk
Low

A preservative

More about Methylparaben
Propylparaben~0.1–0.4%
Formula
Irritation risk
Low

A preservative

More about Propylparaben
Ingredient list view

Benzoyl peroxide, Water, Sodium lauryl sulfate, Cetyl alcohol, Stearyl alcohol, Glyceryl stearate, Glycerin, Butylene glycol, Diazolidinyl urea, Methylparaben, Propylparaben

Compare prices

Retailers ranked by price — lowest first.

Amazon US
Price unavailable Out of stock
Check

Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.

Worth comparing, line by line.

Match % combines shared ingredients, the first five ingredients, shared actives and hero ingredients, irritancy (lower counts in the alternative's favour), texture and body area. Only products in the same routine step are compared.

Side-by-side comparison of this product against its closest alternatives
Jan MariniBenzoyl Peroxide 10%YOUR PRODUCTPaula's choiceResist Advanced Smoothing Treatment 10% AHANeutrogenaOnMaleziaAcne Treatment Gel
Match—60%59%59%
Price—$39.00$10.87$18.20
Shared key ingredients—2 of 22 of 21 of 2
Key difference——Caprylic/Capric Triglyceride—
Irritancy Medium Medium Medium Low
Drying alcohol————
View product Shop Shop Shop
  • matches yours
  • differs
  • cheaper

More alternatives: EPSOLAY Cream, 5%Clinique Acne Solutions All-Over Clearing Treatment Oil-Free

Cheaper alternatives? Browse formulas in the same category.
We compare ingredient profiles across our catalog — pick the closest match for your budget.
Open dupe finder

Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 1 studies and safety reviews.

  1. 1
    Glycerol and the skin: holistic approach to its origin and functionsncbi.nlm.nih.gov
Jan Marini Benzoyl Peroxide 10%
Jan MariniBenzoyl Peroxide 10%
Find on Amazon

Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.

Find on Amazon

As an Amazon Associate, WIMJ earns from qualifying purchases.