Why the number of things a product promises shrinks between the brief and the bench — and why that is usually the right outcome.
Written & researched by Lai Gek Yan, Contributor, ORIZI Group · Technical input by ORIZI Group R&D Team · Fact-checked by Creaton Poh · Published by ORIZI Group · Last reviewed September 2026
Disclosure: This article is published by ORIZI Group and may refer to our own manufacturing experience, services and capabilities. External factual claims are supported by cited sources.
Quick answer: why do multifunctional briefs get shorter in development?
Because each function a formula has to deliver narrows the range of conditions the formula can sit in, and the narrowing multiplies rather than adds. Actives have different stable pH windows, different phase preferences and different tolerances for salt and heat. A brief with five functions is asking for a single set of conditions that satisfies five constraints at once, and sometimes no such set exists. When we return a shorter list, it is normally because the intersection was empty, not because we were unwilling to try.
Key takeaways
- Compatibility is not a yes-or-no property of two ingredients. It is a question of whether their workable windows overlap in the finished product.
- pH is the constraint that decides most multifunctional briefs. L-ascorbic acid needs a strongly acidic environment to be absorbed; several other popular actives prefer conditions closer to neutral.
- The oil phase is a second and less obvious bottleneck: sun filters, emollients and lipophilic actives all compete for the same limited space, and the space is what produces the texture the brief asked for.
- A multifunctional formula is harder to diagnose when something goes wrong, because a single observed failure has more possible causes.
- Two or three compatible functions is where we see multifunctionality actually deliver value. Beyond that, the honest answer is often a short routine rather than one jar.
Scope of this article
This is written from the formulation and manufacturing side, about leave-on and rinse-off cosmetic and personal care products of the kind we make in Malaysia for brand owners. It deals with why functions collide chemically and what we do about it. It is not a regulatory guide, and it does not cover the separate question of what each additional function costs to substantiate as a claim — that side is treated in a companion piece linked at the end. Nothing here describes a specific customer’s formula.
What does “multifunctional” actually ask a formula to do?
A multifunctional product is one that delivers more than one consumer-recognised benefit from a single application — a cleanser that also conditions, a moisturiser that also protects against ultraviolet light, a body wash that also leaves a fragrance layer that lasts. The idea is genuinely attractive. Fewer steps, less packaging, and a shorter routine that people are more likely to keep to.
What the brief does not usually say is that each of those benefits is produced by a different mechanism, and each mechanism has preferences. An exfoliating acid works because the environment around it is acidic. A peptide is usually happiest closer to neutral. A sun filter has to form an even continuous film across the skin, which is a rheology requirement as much as a chemistry one. Fragrance longevity depends on what the fragrance is dissolved in and what else is competing for that solvent.
Put one of those in a formula and you have a target to hit. Put four in and you have four targets that have to be hit simultaneously by one composition. That is the whole story in a sentence, and everything below is detail.
Why is pH the constraint that decides most multifunctional briefs?
pH is a measure of how acidic or alkaline a water-based system is, and in cosmetics it decides three things at once: whether an active stays in the chemical form that works, whether it is absorbed, and whether the preservative system is doing its job. Change pH to suit one ingredient and you have changed it for everything else in the jar.
The clearest published example is vitamin C in its pure form. The percutaneous absorption work by Pinnell and colleagues, published in Dermatologic Surgery in 2001, found that L-ascorbic acid had to be formulated below about pH 3.5 to be absorbed into skin, with absorption falling away as the pH rose and the molecule shifted into its ionised form. That is not a preference. It is a threshold, and it sits at the acidic end of what skin-contact products normally use.
Now add a second function whose preferred window sits in the region between pH 5 and pH 7, which is where a great many peptides, certain botanical extracts and many emulsifier systems are comfortable. The two windows do not overlap. There is no compromise pH that serves both; there is only a pH that serves one and quietly wastes the other. When a brand asks us to put both in one bottle, the formula we could actually make would contain a functioning ingredient and a decorative one, and the decorative one would still appear on the label.
We would rather say so at the brief stage. The alternative — delivering something that tests fine for stability, looks correct on the certificate of analysis and simply does not do one of the things the pack says — is a worse outcome for everyone, and it is the outcome that arrives when nobody asks the pH question early.
The second bottleneck: everything is competing for the oil phase
The pH problem is at least well known. The one that surprises brand owners more often is space.
An emulsion has a water phase and an oil phase, and the oil phase is finite. Organic ultraviolet filters live there. So do the emollient esters that produce a light, fast-absorbing skin feel. So do oil-soluble actives and most fragrance materials. Increase the filter load to raise a sun protection number and you have taken room from the emollients that were producing the texture the brief described as “weightless.” Increase the emollients to fix the texture and the filter film thins out.
This is why hybrid sun-protective products are the hardest multifunctional category we are asked to work on, and why an apparently cosmetic change late in development can undo a performance result. We wrote about that specific coupling in why changing a sunscreen formula means testing the SPF again, and the principle generalises: in a multifunctional formula, the levers are connected.
Preservation is the third constraint, and multifunctionality makes it harder in a way that is easy to underestimate. A richer, more complex formula with more botanical and protein-derived material is a more hospitable environment for microorganisms, and the preservative system has to hold across whatever pH the other decisions have forced. We have written separately about how a clean and natural brief becomes a preservation problem first; a multifunctional brief tends to arrive at the same place by a different road.
A working compatibility view from our development practice
The table below is how our team thinks about pairing functions when a brief arrives. It is a starting frame for a conversation, not a formulation rule book — every judgement in it can be overturned by a specific raw material, a delivery system, or a decision to separate the phases within the pack. We publish it because the shape of the answer is more useful to a brand owner at brief stage than a flat “it depends.”
| Function pairing | Usual outcome | The reason |
|---|---|---|
| Cleansing + conditioning | Works well | Both are surface effects delivered by the same deposition mechanism; no active window to protect. |
| Hydration + barrier support + sensory claim | Works well | All three are served by the emollient and humectant system rather than by competing actives. |
| Hydration + fragrance longevity | Usually workable | Fragrance sits in the oil phase; the constraint is space, and space can be planned for. |
| Exfoliating acid + peptide or protein active | Often not workable together | The acid needs a low pH to function; many peptides degrade or lose activity there. |
| Pure L-ascorbic acid + most other actives | Rarely workable in one phase | The below-pH-3.5 requirement excludes most of the useful range. A derivative or a separated pack is the usual answer. |
| Sun protection + colour + light texture | Workable but tightly coupled | Filters, pigments and emollients compete for the same phase; any change re-opens the performance question. |
| Anti-dandruff or antimicrobial + rich conditioning | Needs care | Deposition of the functional material can be blocked by the conditioning system meant to sit on the same surface. |
What we do when the windows do not overlap
Based on ORIZI Group’s manufacturing experience, three routes account for most of the resolutions we reach with brand owners, and only one of them is “drop a function.”
The first is substitution. A different form of the same active often has a much wider workable window. Vitamin C derivatives, for instance, are used precisely because they tolerate conditions that pure L-ascorbic acid does not, at the cost of a different performance profile that has to be described honestly rather than borrowed from the pure form’s literature.
The second is separation inside the pack. A dual-chamber format, a two-part system mixed at the point of use, or an anhydrous phase that meets the water phase only on the skin lets two incompatible windows coexist commercially even though they cannot coexist in one bulk. This costs more in components and filling, and it is worth raising early because it changes the packaging conversation, not just the formula.
The third is re-ranking. We ask which one function the product would still be bought for if the others were removed, and we build outward from that. In our experience this conversation resolves more briefs than any laboratory trial does, because most five-function briefs contain two functions the brand genuinely cares about and three that were added because a competitor listed them.
Risks and limitations worth naming
A multifunctional formula carries a diagnostic cost that is rarely priced in. When a single-purpose cream develops a problem in storage, the list of suspects is short. When a product carrying four functions separates, discolours or loses performance, the investigation has to work through more possibilities, and each round of investigation takes a stability cycle to confirm. Brands should expect a longer feedback loop on hybrids and plan launch dates accordingly.
There is also a labelling honesty risk that sits close to our side of the work. An ingredient that is present but not functioning at the formula’s conditions is still legally present and still listed. Nothing about that is false, and everything about it is misleading if the pack implies a benefit the ingredient cannot deliver there. We raise it when we see it, and we would encourage any brand owner to ask their manufacturer the direct question: at this pH, in this base, is every active on this list actually doing something?
Finally, this article generalises. Specific raw materials, encapsulation and delivery systems, and buffering strategies can and do move the boundaries described above. Treat the table as a way to ask better questions of whoever is formulating for you, not as a verdict on a particular combination.
Frequently asked questions
Is a multifunctional product always more difficult to make?
No. Difficulty tracks the number of measured functions, not the number of benefits on the pack. A cream that hydrates, softens, smooths and smells good is delivering four consumer benefits from essentially one system and is no harder than a plain moisturiser. A cream that hydrates and also has to hit a sun protection number is a different project. Count the functions that need a laboratory result, not the bullet points.
Can vitamin C and niacinamide be in the same product?
They can coexist in modern formulations, and many products on the market contain both, but the honest version of the answer depends on which form of vitamin C is used. Pure L-ascorbic acid needs a pH below roughly 3.5 to be absorbed, which is outside the range where niacinamide is most comfortable over a long shelf life. Using a vitamin C derivative, or separating the two into different steps or chambers, is the usual route. Ask which form is in the formula before accepting a yes or a no.
How many functions can one product realistically carry?
In our development practice, two or three compatible functions is where multifunctionality reliably delivers what it promises. Beyond that, the constraint is rarely ambition and almost always the intersection of the windows. If a brief lists five, we normally expect to return with a recommendation that groups them into a product and a short routine rather than a single jar.
Does combining functions reduce the minimum order quantity?
Consolidating several products into one usually does reduce the total quantity a brand has to fund and the number of component sets it has to buy, which is often the real reason a hybrid is attractive. The appropriate minimum order quantity still depends on product format, raw materials, packaging and validation requirements, so it is best settled against a specific brief rather than assumed from the concept.
Will a hybrid formula have a shorter shelf life?
Not automatically, but it has more ways to fail, and the preservative system has less freedom because the pH and the composition were decided by other constraints. We would expect a hybrid to need at least as much stability work as its single-function equivalents, and to be less forgiving of late changes. Plan the testing window from the number of functions rather than the number of products.
Sources and references
- Pinnell SR et al., “Topical L-ascorbic acid: percutaneous absorption studies,” Dermatologic Surgery, 2001 — PubMed record.
- National Pharmaceutical Regulatory Agency (NPRA), Malaysia — Guideline for Cosmetic Claims, Annex I Part 8 (August 2022), for the main-function and secondary-claim framework referred to above.
- International Organization for Standardization — ISO 11930:2019, evaluation of the antimicrobial protection of a cosmetic product.
- Topic source and inspiration: Azelis Personal Care, Multifunctionality and convenience: meeting modern beauty consumer needs. The formulation observations above are our own.
- Further reading, from the sourcing and claims side: Multifunctional beauty: what each extra claim really costs (OEM Hallmark).
Update history
September 2026 — first publication.
If you are working on a hybrid brief
Most of the value in this conversation arrives before anything is weighed out. If you are shaping a multifunctional product and want a second view on which functions are likely to sit together and which are pulling against each other, our team is happy to talk it through. You can see the categories we formulate and manufacture on our skincare OEM page, read how we approach product testing, or simply get in touch with the brief as it stands — including the version with five functions on it. That is usually the most useful place to start.
