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Exfoliation for skin that hates exfoliants. TIRTIR's PHA 15% Serum resurfaces gently: smoother-looking texture, refined pores and a fresher glow, without the sting that stronger acids bring. PHA is the mildest of the exfoliating acid family, making 15% both effective and comfortable.
Why PHA
PHAs (polyhydroxy acids) have larger molecules than AHAs, so they work at the surface gradually and hydrate as they exfoliate, the go-to acid for sensitive and beginner skin. New to acids? Read our AHA vs BHA vs PHA guide.
What it helps with
Rough, uneven texture; dull tone; and congestion-prone areas, all the classic exfoliation wins, delivered softly. Explore more in exfoliating acids and pore & texture care.
Who it's for
Sensitive skin that reacts to glycolic or salicylic; exfoliation beginners; and anyone who wants steady, irritation-free resurfacing. Daily SPF is essential with any acid.
Partager
How to Use
1. In the evening after cleansing and toner, apply 2–3 drops to dry skin.
2. Start 2–3 nights a week, building up as your skin adjusts.
3. Follow with a barrier-supporting moisturizer.
4. Wear SPF50+ every morning while using any exfoliating acid.
Tip: patch test first, and don't combine with retinoids or other acids in the same routine.
What is PHA and how is it different from AHA or BHA?
PHA (polyhydroxy acid) is the gentlest exfoliating acid family. Its larger molecules work gradually at the surface and even attract moisture as they exfoliate, so you get smoother texture with far less sting than AHAs or BHAs.
Is 15% PHA too strong?
No — because PHA is inherently mild, 15% delivers visible smoothing while staying comfortable for most skin. Start 2–3 evenings a week and build up as your skin adjusts, and always patch test first.
Can sensitive skin use this serum?
PHA is the acid most often recommended for sensitive and reactive skin, which is exactly who this serum is designed for. Introduce it slowly, pair with a barrier-supporting moisturizer, and patch test if your skin is very reactive.
How often should I use it?
Start 2–3 evenings a week, then increase toward nightly use if your skin stays comfortable. Avoid combining it with strong retinoids or other acids in the same routine, and wear SPF every morning.
What results can I expect?
Smoother-feeling texture and a fresher look within a couple of weeks, with pores and rough patches looking more refined over 4–8 weeks of consistent use. Gentle consistency beats aggressive exfoliation.
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