Effaclar Duo (+) — Reddit Reviews
Updated September 8, 2026
Benzoyl peroxide and niacinamide target acne and reduce inflammation; can irritate skin.
What the community says
This is a benzoyl peroxide and niacinamide treatment favored by Reddit acne users and rosacea patients for reducing cysts and inflammation. Studies found niacinamide worked about as well as benzoyl peroxide for acne, and Reddit agrees, but this formula can dry and irritate sensitive skin. Users with eczema or dry skin often avoid it due to barrier damage concerns.
What this means for you
What people love
- Benzoyl peroxide reliably clears cystic acne overnight
- Niacinamide reduces inflammation and improves acne similarly to benzoyl peroxide
- Works quickly on monthly hormonal breakouts and stubborn spots
Watch out for
Product details
Key Ingredients
Where to buy
What the science says vs. what Reddit says
What the science says
Niacinamide
Some evidence for acne- It often improved acne, but many studies used niacinamide together with other ingredients
- 19 studies back this, including one large review
- Some studies found it worked about as well as clindamycin or benzoyl peroxide
- A few studies found niacinamide beat a placebo or no treatment for red, sore spots and blemishes
- No major side effects were reported in the findings given
What Reddit says
The why
Benzoyl peroxide content helps reduce cystic lesions overnight with a strong drying effect noted by users.
“Got it under control for about 7 years from the age of about 37 with just regular zinc, la Roche posay effaclar + (old British formula since been reformulated).”
16 mentions for acne
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 37 mentions across 18 threads
La Roche-Posay Effaclar Duo (+) on Reddit, in one place — 18 threads from r/SkincareAddiction, r/acne and 2 more, summarized.
“or La Roche Posay Effaclar duo spf30 for daytime.”
Mentioned
“Perhaps you need a day time moisturizer that has some actives in it”
Mentioned
“La Roche Posay Effaclar duo spf30”
Mentioned
“When I was 29, I tried La Roche Posay Effaclar Duo spot treatment (I think that’s what it’s called)? I’m not kidding when I say, within 3 weeks it cleared up.”
Positive
“Even now, if I feel a breakout coming, I’ll use it 2x a day and I won’t get that breakout.”
Positive
“My derm said to use it for cysts and it does help a lot.”
Positive
“I use the effaclar duo but do sandwich method with the b5 balm”
Mentioned
“I use the effaclar duo”
Mentioned
“effaclar duo”
Mentioned
“the La Roche Posay Effaclar Duo was the only product that really worked for me”
Cautionary
“Unfortunately, they changed the formula a few years ago and it broke me out.”
Cautionary
“I’ve been looking for a good replacement ever since.”
Cautionary
“had a persistent red spot just like yours for over a year.”
Positive
“the la roche-posay effaclar duo spot treatment finally zapped mine after weeks of consistent use.”
Positive
“stick with it, you'll get rid of it!”
Positive
“La roche posay effaclar duo”
Positive
“The only thing that helps calm down the breakouts that I’ve tried so far is “La Roche Posay Effaclar duo” and I believe it’s because it had 5.5% benzoyl peroxide.”
Positive
“I like the effaclar duo as well but it’s very strong.”
Positive
Dupes & Alternatives
Stridex
Daily Care Acne Pads With Salicylic Acid, Maximum Strength
Better for Acne
4 shared traits
122 mentions
