Redness Reform Sulfur Cleanser (2.5% Colloidal Sulfur) — Reddit Reviews
by Prequel
Updated October 30, 2026
Reddit loves 2.5% sulfur for rosacea; studies found acne improvement, evidence remains limited.
What the community says
A 2.5% sulfur cleanser with azelaic acid that Redditors use for rosacea redness, pustules, and congestion. Studies found sulfur reduced acne spots, but sensitive or dry skin may find daily use too stripping and need every-other-day dosing.
What this means for you
What people love
- 2.5% colloidal sulfur; a rosacea-community GOAT
- Azelaic acid included for pustules and acne
- Can double as a brief treatment mask
Watch out for
Product details
Use caution
Skin Type
Product Traits
Key Ingredients
Where to buy
What the science says vs. what Reddit says
Acne
Not proven yet
Few or mixed studies. This claim isn't established.
Sulfur: 1 study tested it directly. See all 5 studies
On Reddit: Pustules stay at bay with sulfur and azelaic acid; one user uses it as a ten-minute mask. 10 mentions
Rosacea
Not proven yet
Few or mixed studies. This claim isn't established.
Sulfur: 1 study tested it directly. See all 4 studies
On Reddit: Nighttime sulfur washing keeps pustules at bay, though users reserve it for evenings because of the smell. 18 mentions
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 76 mentions across 30 threads
Prequel Redness Reform Sulfur Cleanser (2.5% Colloidal Sulfur) on Reddit, in one place — 30 threads from r/SkincareAddiction, r/Rosacea and 3 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
“I’ve been doing sulfur cleanser and 15% azelaic acid for like four months now with no progress 😭”
Cautionary
“sulfur cleanser”
Cautionary
“with no progress”
Cautionary
“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
“The sulfur wash from Prequel is so gentle.”
Positive
“I’ve had a similar experience with other ones being too harsh but I took the chance and my texture is clearing up”
Positive
“The sulfur wash from Prequel”
Positive
“The prequel SA cleanser can be a more gentle way to keep salicylic acid in your routine.”
Mentioned
“The prequel cleanser uses a time release encapsulated salicylic acid”
Mentioned
“more gentle and more effective than unencapsulated SA”
Mentioned
