Lip scrubs have had a long run in the beauty world, but for anyone who has ever over-buffed their way to raw, irritated lips, the appeal has its limits. The Ordinary, the brand that built its reputation on no-nonsense formulations at prices that feel almost too good to be true, is making a case for a gentler approach  and at $8.50, the barrier to trying it is practically nonexistent.

The PHA 5% Exfoliating Lip Serum is one of the brand’s newer offerings, and it is already generating real enthusiasm among people who have struggled with chronic dryness, flaking, or lips that never quite feel smooth enough for a clean lipstick application.

What makes it different from a standard lip scrub

Physical exfoliators  the gritty, sugar-based scrubs that have dominated lip care for years  work by manually buffing away dead skin. The results can be immediate but are often short-lived, and for people with sensitive or reactive skin, the abrasion can cause more irritation than it resolves.

This serum takes a different route entirely. It relies on polyhydroxy acid, or PHA, a chemical exfoliant that dissolves the bonds holding dead skin cells in place rather than scrubbing them off. What makes PHA particularly well-suited for lip use is its molecular size  it is larger than alpha hydroxy acids like glycolic or lactic acid, which means it penetrates more slowly and is considerably less likely to cause stinging or redness. For the thin, delicate skin of the lips, that distinction matters.

What is actually in it

The formulation is built around four key ingredients that work together rather than in isolation.

PHA handles the exfoliation, clearing dead cells to reveal a smoother surface underneath. Glycerin, a well-established humectant, draws moisture into the skin and holds it there. Ectoin — a protective compound increasingly common in barrier-focused skincare  helps shield the lips from environmental stressors while reinforcing moisture retention. Wild carrot extract rounds out the formula as an antioxidant that supports the skin barrier and reduces water loss.

The combination means the serum is not just removing dead skin but actively working to keep the new skin beneath it hydrated and protected. That dual action is what separates it from a product that simply exfoliates and leaves.

How to use it for the best results

Application is straightforward. Starting with clean, dry lips, dispense a small drop onto a fingertip and spread a thin, even layer across the mouth. Because PHA is gentler than stronger acids, it does not require a long adjustment period for most people  but starting with no more than three uses per week is a reasonable approach, particularly for those with sensitive skin.

Most people who have incorporated it into their routine apply it at night, allowing the serum to work while they sleep and pairing it with a nourishing lip balm on top to seal everything in. The result by morning, according to many who have tried it, is noticeably softer lips with a smoothness that holds up through the day.

Is $8.50 actually worth it

The price point is genuinely hard to argue with. At $8.50, the serum costs less than most lip scrubs from prestige brands and considerably less than the acid-based lip treatments from higher-end skincare lines that offer similar chemistry. The Ordinary has built its entire identity on making well-formulated products accessible, and this release fits squarely within that ethos.

For anyone dealing with persistent dryness, seasonal chapping, or lips that never look quite polished enough, the investment is minimal and the potential payoff is real. With consistent use a few times per week, the improvement in texture and hydration is something most users begin to notice within the first couple of weeks.

Where to find it

The PHA 5% Exfoliating Lip Serum is available through The Ordinary’s website as well as at major beauty retailers that carry the brand. Given how quickly The Ordinary products tend to sell out when they gain traction online, it is worth picking up sooner rather than later.

If chapped, flaky lips have been a recurring frustration, this serum offers a science-backed, budget-friendly reason to rethink your entire approach to lip care.