There is more information about skincare available to you right now than at any point in human history. There are also more products, more brands, more Instagram experts, more TikTok routines, and more contradictory advice than any consumer can reasonably navigate on their own.
Which is why most people end up with a bathroom shelf full of expensive products that don’t work, not because they’ve made bad choices, but because they’ve been sold to using marketing language that gives them no way to evaluate what they’re buying.
As a Specialist GP and Dietitian, I’ve watched this play out from both angles, the medical consultations where patients arrive with skin problems that turn out to be diet problems, and the skincare conversations where they’ve been sold expensive actives that will never do what the marketing promised.
The frameworks in this post exist because those two conversations should never have been separate in the first place.
Ongoing, I’ll be publishing a series of posts working through the clinical territories of skin — oxidative stress, barrier disorders, keratinization, sebum, cutaneous flora, redness, pigmentation, and regenerative skin health. Each of those posts will walk you through the actives that actually matter in that territory, what the evidence supports, and how to think about building a routine that addresses your specific concerns.
But before any of those posts land, we need to talk about how to evaluate any skincare active — because the framework matters more than the ingredient list.
This post is that framework. Save it. Refer back to it every time you’re being sold a product. Apply it to anything I recommend as well as anything you see elsewhere. The framework works on everything.
Why marketing language gives you nothing
Walk into any skincare aisle and you will find bottles labelled with words that sound scientific but tell you almost nothing. Advanced peptide complex. Clinically proven anti-aging formula. Dermatologist-tested. Contains active botanicals. Powered by [proprietary technology name].
None of those phrases give you information you can use. They’re designed to feel like evidence without actually being evidence. And they work — because most consumers assume that if a brand can afford to make those claims on their packaging, someone somewhere must have checked.
Nobody checked.
That’s the entire problem.
Skincare in most jurisdictions — including Australia — is regulated as cosmetics, not medicines. Which means the claims on a bottle do not have to meet the same standard of evidence that a therapeutic goods claim would. Brands can imply results, describe mechanisms, and invoke scientific-sounding language without ever proving that the specific product in the specific bottle does what the marketing suggests.
That’s the reality of the market you’re shopping in. Your job — and mine — is to know how to see through it.
The three-bucket framework
When you look at any active skincare ingredient, it falls into one of three evidence buckets. Learn to sort them.
Bucket one — actives with genuine controlled human clinical evidence.
A small number of active ingredients have been studied in multiple double-blind, placebo-controlled human trials. Results are statistically significant. Effect sizes are modest but real. Mechanisms are understood. These are the actives that deserve the space they take up in a routine — retinoids, certain forms of vitamin C, niacinamide, hydroxy acids at appropriate concentrations, specific peptides like palmitoyl pentapeptide-4, and a handful of others. The bucket is smaller than the marketing implies.
Bucket two — actives with biologically plausible mechanisms but limited human evidence.
A much longer list of actives have in vitro data (laboratory studies in cell cultures) and animal data supporting a mechanism, but few or no controlled human trials. The marketing for these often quotes the in vitro findings as if they translate directly to your skin. They don’t necessarily. An active that produces an effect in a petri dish under controlled conditions is not the same as an active that produces a clinically meaningful outcome when applied topically to living human skin under normal use conditions. Bucket two actives may still be worth including in a routine — but with realistic expectations about what the evidence actually supports.
Bucket three — actives marketed loudly with almost no evidence at all.
Some ingredients on the market have effectively no published controlled human research. They’re biologically plausible because all actives are biologically plausible — molecules do things. That’s not the same as evidence that this specific active, at this concentration, in this formulation, applied topically, produces a clinically meaningful outcome. Most of the “innovative new active” story in skincare marketing lives in bucket three. Beautiful packaging. Compelling backstory. No trials.
The marketing rarely tells you which bucket the active on your bottle is in. That’s the gap. Learning to sort actives into these buckets is the single most useful thing you can do for your skincare literacy.
The four questions
Once you know how to sort the evidence, you need to know how to evaluate a specific product. Four questions. Apply them to anything.
One — is the specific active named?
Not “peptide complex” or “advanced botanical blend” or “vitamin C derivative.” The actual molecule. Palmitoyl pentapeptide-4. L-ascorbic acid. Retinaldehyde. Niacinamide. Salicylic acid. If the brand can’t or won’t tell you the specific active and its concentration, the product is hiding behind a marketing word.
Two — does that active have published controlled human trials for the concern being marketed?
Bucket one, bucket two, or bucket three? You can search PubMed in two minutes. So can the brand. The honest brands cite the studies. The dishonest ones imply evidence that doesn’t exist.
Three — is it in a form and delivery system that can actually reach the target tissue?
This is the question the marketing works hardest to hide. An active molecule can only do something if it actually reaches the layer of skin where it needs to act. Many actives are too large to cross the stratum corneum in their raw form. Others degrade rapidly when exposed to air, light, or the wrong pH. A product can contain an evidence-backed active at a strong concentration and still do nothing, because the formulation isn’t stable, the delivery system doesn’t work, or the active can’t get where it needs to go. A well-formulated product is a system, not a single hero ingredient. A badly formulated one wastes the active entirely.
Four — does this active fit your specific skin, or are you buying it because a stranger on Instagram uses it?
This is where most bathroom shelves go wrong. Someone with genetically dry, resilient skin can layer active after active without consequence. Someone with a compromised barrier, sensitive skin, or an underlying condition may be actively damaged by the same routine. Actives are chosen based on assessment, not aspiration. If you don’t know what your skin actually needs, adding more actives to it is not a solution — it’s a gamble.
What I do in my clinic
Because a post that critiques marketing without offering an alternative is just cynicism, and cynicism is not medicine.
In my clinic, I use Universkin — a French compounded skincare system where serums are mixed to your specific skin diagnostics. The strength of the system is the personalisation: actives are selected and concentrated based on what your skin actually needs across the clinical territories I’ll be walking through in the coming posts. Compounded medical-grade skincare delivered like a prescription. That’s the model.
For more targeted clinical correction, I use SkinCeuticals P-TIOX, a peptide- and antioxidant-rich corrective serum I include in specific patients’ plans. Established formulation, evidence-aware brand, clinical performance I can document over time.
Both of these live inside clinical plans — assessed, prescribed, monitored. Skincare is one part of those plans. Diet, oral supplementation where indicated, lifestyle factors, and the broader medical picture are the other parts, because as a Specialist GP and Dietitian I don’t treat skin as a system separate from the person wearing it. That’s how actives actually deliver value: as part of a considered plan built around your specific skin and the biology underneath it, not as hero products you pick up because the bottle looked nice.
What comes next in this series
This post is the lens. The posts that follow this one will walk through the clinical territories of skin — how a doctor thinks about diagnosing what’s actually going on, which actives address which territories, where the evidence is strong versus weak, and how a real routine gets built around a real assessment.
We’ll cover oxidative stress and the antioxidants that address it. Cutaneous barrier disorders and the actives that repair them. Keratinization disorders and the role of retinoids. Sebum disorders and how they connect to acne. Cutaneous flora and the emerging microbiome science. Redness and the inflammatory pathway. Hyperpigmentation and its multiple mechanisms. And finally, skin appearance — the regenerative territory where wound healing, sagging, and striae are addressed.
Eight clinical territories. One post each. Each post uses the framework you’ve just read as its starting point. If you understand this post, you’ll be able to read all the ones that follow it and know exactly what to do with the information — which is more than most of the skincare content in your feed can offer.
The principle
Skincare is not complicated because the science is complicated. Skincare is complicated because the marketing is complicated.
Because there is enormous commercial incentive to make you feel that you need more products, more routines, more actives, more everything, in order to solve problems that most consumers haven’t been properly diagnosed with in the first place.
The framework in this post cuts through that. It’s the same framework I apply in my consult room every day. It’s the same framework I want every reader of this series to have.
If a brand can name the active, cite the study, explain the delivery, and place the product inside a plan that fits your specific skin — you’re being sold medicine.
If they can’t, you’re being sold theatre.
Skin science, without the noise.
Dr Sarah Anthony | BBiomedSc, MBBS, MND, FRACGP
