How claims are tested
Dermatologist tested, clinically shown, consumer tested: what sits behind the words, and how to judge a claim yourself.
How to read a skin study without a science degree
A plain guide to reading a skin care study: what the abstract, methods, results and limitations tell you, the red flags to watch for, and how to find studies on PubMed.
“Clinically tested” vs “clinically proven”: not the same promise
“Clinically tested” says a test happened; “clinically proven” says a result was shown. What each phrase means, the ingredient loophole, and the questions to ask before trusting either.
Why an independent review of a product’s evidence matters
Conflicts of interest, what arm’s-length reviewers do, what a third-party review of a skin care claim examines, and what it doesn’t do (it isn’t a safety approval).
“Oil-free”: what it promises for breakout-prone skin
What “oil-free” means on a moisturizer, why it has no legal definition, how oils differ from oily-feeling ingredients, and why “oil-free” and “non-comedogenic” aren’t the same promise.
Who checks skin care claims in Canada?
How Health Canada, the Competition Bureau and Ad Standards share the checking of skin care claims, why cosmetics and drugs follow different rules, what a label can’t say.
“pH balanced”: does a cleanser’s pH matter for your skin?
What “pH balanced” can and can’t mean on a cleanser, what research says about pH and your skin barrier, and why the type of detergent matters as much as the number.
“9 out of 10 agreed”: consumer perception tests explained
What a consumer perception test is, how it differs from instrument measurements and expert grading, why companies use both, and how to read a “9 out of 10” number.
Who tracks skin allergies? How patch-test data is collected
How dermatology clinics in Canada and the US pool patch-test results to spot rising skin allergies, what that data can and can’t tell you, and how it has changed ingredient rules.
Not all evidence is equal: from lab dish to clinical trial
The evidence ladder for skin care, from lab-dish tests and animal studies to randomized trials and systematic reviews, and why a dish result may not work on skin.
Before-and-after photos: what they can and can’t show
How lighting, angles, expression and retouching change a before-and-after photo, how clinical trials standardize their photos, and what Canadian advertising rules say about images.
How to judge a skin care claim in 60 seconds
A quick six-question checklist for any skin care claim: who tested it, on how many people, what was measured, for how long, was it published, and who paid.
“Up to”, “helps”, “visibly”: the slippery words in skin care ads
Why skin care ads lean on words like “up to”, “helps”, “visibly” and “the look of”, what each one really promises, and what Canadian advertising rules say about fine print.
What a clinical study really is (and why it matters for skin care)
Control groups, randomization, blinding, sample size and publication explained in plain words, so you can tell a solid skin care study from a weak one.
Why the number of people in a skin study matters
How sample size, statistical power, dropouts and subgroups change what a skin study can tell you, with a real example of a small trial and a big one that disagreed.
“Consumer-perceived” results: what the small print means
What “consumer-perceived” and “self-assessed” mean under a skin care claim, why your own skin is a tricky witness, and how to read the asterisk before you believe the number.
“Dermatologist tested” vs “dermatologist recommended”: what’s the difference?
Neither phrase is a regulated term in Canada. Learn what each one usually involves, what it doesn’t prove, and the questions to ask before you trust it.