The brief that keeps landing on formulators’ desks
Two or three years ago, an exfoliating scrub brief from a brand partner usually said one thing: make it stronger. Higher acid percentage, coarser grit, faster visible result. That brief has largely been replaced by a harder one — combine a mild physical particle with a low-concentration acid, and make the safety story legible on a 40mm label.
Glycolic acid sits at the centre of most of those requests. It’s the smallest molecule in the alpha hydroxy acid family, which is why it moves through the stratum corneum more readily than lactic or mandelic acid and why it loosens desmosomal bonds between corneocytes efficiently at modest use levels. That same property is what makes it awkward to pair with abrasion. You are stacking two mechanisms that both remove surface cells, and the failure mode is a compromised barrier rather than a visible defect the QC lab would catch.
What a hybrid formula is actually doing
Two mechanisms, one contact time
A physical particle clears sebum, residue and loose flakes at the surface. The acid works chemically on the bonds holding dead cells in place. Put them in the same base and the acid keeps working after the rinse while the skin has already been mechanically stressed. The formulation answer most partner brands settle on is to bring the acid level down and specify a rounder, finely milled particle rather than to shorten contact time — consumers do not measure contact time, and no instruction on a tube will make them.
Particle selection carries its own constraint. The move away from plastic microbeads pushed the category toward jojoba esters, cellulose, and milled seed or shell powders, and those materials behave very differently under a thumb. Angular fragments from a hard shell can produce micro-tears on thin facial skin at pressures that a rounded ester bead would not. If you are sourcing in this category, the particle regulations that reshaped it are the reason your options look the way they do.
Where the base does the work
The surfactant system matters more here than in a plain cleanser. A high-foam sulfate base strips lipids that the acid has already made more accessible, and the two effects compound. Partner briefs increasingly specify a mild primary surfactant and a post-rinse residue that leaves something behind — glycerin, panthenol, a light emollient. Buyers who have run this category before tend to arrive already knowing that, and ask for it by name.
The concentration question
For products aimed at sensitive or first-time users, 2–5% is the range brands generally ask us to work in. It gives measurable turnover without the sting that drives returns and one-star reviews. Higher levels are defensible for combination and oily skin positioning, but they change the regulatory and messaging picture: increased UV sensitivity has to be stated, and sunscreen guidance stops being optional advice and becomes part of the pack copy.
There is also a sequencing issue that formulation cannot solve. A mechanical product and a separate chemical exfoliant used on the same day is the single most common cause of over-exfoliation complaints in this category. Brands selling both need to say so — on pack, in the PDP, and in whatever routine graphic they hand to retail. A regimen page that shows the two products alternating days is worth more than another paragraph of ingredient copy.
Positioning follows from that. The comparison a shopper actually makes is not between two scrubs. It’s between this product and the gentle cleanser already sitting on their shelf, which they know does not sting. That’s the framing the claim set has to survive, and it argues for a narrow, concrete promise — texture, not transformation.
Claims you can actually defend
Smoother texture and improved absorption of subsequent steps are defensible and easy to demonstrate. Reduction of fine lines is not, at least not from a rinse-off product used two or three times a week, and a claim like that invites scrutiny in markets with stricter cosmetic advertising rules. The safer route is to describe the mechanism plainly and let the routine graphic carry the aspiration.
Post-use support ingredients — ceramides, panthenol, allantoin, niacinamide — are worth naming on pack even at low levels, because they answer the objection the shopper already has. Someone who has been over-exfoliated once reads an ingredient list looking for reassurance, not potency.
Night-time use is worth recommending explicitly rather than leaving to inference. It sidesteps the UV exposure question entirely, and it puts the product at the point in the day when the barrier-support step that follows is most likely to actually happen.
A short sourcing checklist
- Specify particle material and mean size, not just “gentle” — the two are not interchangeable and the second is not testable.
- Fix the acid at a level you can hold across production lots; drift in a low-percentage system is proportionally larger than in a high one.
- Decide early whether the SKU sits alone or inside a routine, because that determines whether the pack has to carry alternation guidance.
- Budget for a sensitive-skin panel if the positioning leans that way. It’s the only evidence that answers the review-section objection.
- Agree what the finished product is called. “Polish”, “resurfacing wash” and “exfoliating scrub” set different expectations for grit level, and the name reaches the customer before the copy does.
Beyond the face, requests for body and underarm variants of an acid-and-particle face wash format arrive regularly, and they are not a straight scale-up. Thinner, occluded skin needs a different particle and usually a lower acid level than the facial version it was derived from, even though the marketing wants one story across the line.
“From the OEM side, glycolic acid is one of the most frequently requested actives in scrub and exfoliant briefs we get from partner brands — but the requests have changed. Buyers used to ask simply for ‘higher percentage, stronger exfoliation.’ Now most are asking how to combine a lower-concentration acid with a physical scrub safely, and how to communicate that safety on pack and online. It reflects a broader shift we’re seeing across the category: consumers are more educated about over-exfoliation risk, so brands that can credibly message ‘gentle but effective’ tend to resonate more than brands leading purely with potency claims.” — Hyejin Cho, Digital Marketing Specialist, Marketing and Communication Team at SPSCOS