Redness Reform Sulfur Cleanser (2.5% Colloidal Sulfur) — Reddit Reviews
by Prequel
Updated September 8, 2026
2.5% colloidal sulfur reduces rosacea redness and acne; can be drying for some.
What the community says
A 2.5% colloidal sulfur cleanser popular for rosacea and acne management. Reddit users praise its gentle formula that calms redness and clears pores, though some find it drying. Studies show mixed acne results; sulfur combos perform variably compared to retinoic acid and benzoyl peroxide.
What this means for you
What people love
- Gentle sulfur cleanser effective for rosacea redness and acne
- Affordable and widely praised for calming irritated, sensitive skin
- Boosts pore clarity and reduces pustules without strong smell
Watch out for
Product details
Concerns
Use caution
Key Ingredients
Where to buy
What the science says vs. what Reddit says
What the science says
Sulfur
Not proven yet for acneFew or mixed studies. This claim isn't established.
- Sulfur showed mixed results for acne in the studies available
- 2 studies back this, both tested sulfur used together with other ingredients
- One study found good to excellent clearing with benzoyl peroxide
- Another study found a sulfur combination worked less well than retinoic acid
- Few side effects were reported in one study
Studied at 2%this product: 2.5%
See 5 studiesWhat Reddit says
The why
Sulfur cleanser calms pustules and prevents new breakouts without harsh burning effects.
“I use the Prequel sulfur cleanser every other day”
6 mentions for acne
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 24 mentions across 22 threads
Prequel Redness Reform Sulfur Cleanser (2.5% Colloidal Sulfur) on Reddit, in one place — 22 threads from r/SkincareAddiction, r/Rosacea and 2 more, summarized.
“Prequel just came out with a sulfur cleanser that is amazing”
Mentioned
“If you are looking for acne control and trying not to burn your face off, try these!”
Mentioned
“Sulfur is the unsung hero of skincare.”
Mentioned
“Prequel’s new sulfur cleanser is also helping my skin SO MUCH.”
Positive
“Not sponcon I’m just a regular person.”
Positive
“It’s gentle!”
Positive
“just picked up the sulfur cleanser.”
Cautionary
“I've tried the sulfur cleasner and liked it initially but then realized I was giving myself a reaction because I'm allergic to sulfa products.”
Cautionary
“I thought about ordering the sulfur cleanser but the prescription cream I’m about to start has azelaic acid in it”
Cautionary
“I am currently waiting for the sulfur cleanser to come back in stock.”
Positive
“I want the sulfur cleanser so badly.”
Positive
“the sulfur cleanser is the way the truth the life. i will rebuy when it comes back in stock. i am oily w/ rosacea and it is the best”
Positive
“I bought the prequel one but haven’t tried it yet - my derm recommended that one.”
Mentioned
“Just bought the one from Prequel but haven’t received yet”
Mentioned
“I can’t use most Prequel products because they use a lot of ingredients that break me out / flare my rosacea”
Mentioned
“Prequel sulfur cleanser is GOAT for redness”
Positive
“I have had GREAT success with metronidazole gel and a sulphur face wash that I use once a day.”
Positive
“I use sulfur for rosacea”
Positive
