Is That Dupe Really a Dupe? A 5-Step Label Check Before You Switch
Some dupes are close copies of the original formula. Others share one hero ingredient and the colour of the box. Five checks on the label tell you which one you are holding.
Updated October 30, 2026
"Dupe" has become one of the biggest words in beauty shopping: a cheaper product that promises the same result as a famous one. Some dupes really are close to the original formula. Others share one headline ingredient and a similar bottle, and that is where the resemblance ends. The good news is that the label tells you a lot, if you know where to look. Here is the five-step check.
A dupe is not a counterfeit. A dupe is sold under its own brand name; a counterfeit pretends to be the original brand. Counterfeits are illegal in most countries and can contain anything, so buy from retailers you trust.
Step 1: Compare the first five ingredients
On an INCI list, ingredients are listed from highest to lowest concentration down to 1%; below that they can appear in any order. The first five or so ingredients are the base: water, glycerin, oils, silicones, thickeners. The base decides texture, finish and how the product feels on your skin. If the two bases look nothing alike, the products will not feel alike, whatever the front says. (New to INCI? Start with how to read an ingredient list.)
Step 2: Check the active, and its exact form
"Vitamin C" or "retinol" on the front is a family name, not a formula. The INCI name tells you which member of the family is inside, and they behave differently:
- Vitamin C: ascorbic acid is the classic, potent but fragile form. Derivatives such as sodium ascorbyl phosphate, ascorbyl glucoside or tetrahexyldecyl ascorbate are more stable but are different ingredients.
- Vitamin A: retinol, retinal (retinaldehyde) and retinyl palmitate are three different strengths of the same idea.
- Exfoliating acids: glycolic, lactic and salicylic acid each work differently and suit different skin.
If the original uses one form and the dupe uses another, it is a cousin, not a copy.
Step 3: Estimate the dose with the 1% trick
Brands don't have to print percentages. But some ingredients have known limits that act as a ruler. In the EU, the preservative phenoxyethanol is allowed at up to 1%. Anything listed after it is therefore present at 1% or less. If the original lists its star ingredient near the top and the dupe lists it after phenoxyethanol, the dupe contains much less of it.
When both products do print a percentage, check that it refers to the same form of the ingredient (see step 2). "10% vitamin C" means little if one is ascorbic acid and the other a derivative.
Step 4: Look at the packaging and format
Packaging is part of the formula. Fragile ingredients such as ascorbic acid and retinol last longer in opaque, airless or pump packaging than in a clear jar opened every day. A gel and a cream with the same actives will feel very different. And one rule has no exceptions: never assume a sunscreen dupe has the same protection. SPF and UVA protection are measured by testing the finished product, so only the claims printed on the dupe's own label count. Our guide to sunscreen labels explains what to look for.
Step 5: Ask people who used both
Two products with nearly the same ingredient list can still differ in ways the label can't show: raw material grades, how the formula was made, texture, scent, pilling under makeup. This is where reviews earn their place. Look for reviews that mention the original by name, and for people with your skin type.
| Check | True dupe | Red flag |
|---|---|---|
| First five ingredients | Same or very similar base | Completely different base |
| Active form | Same INCI name | A different derivative |
| Active position | Similar place in the list | Listed after phenoxyethanol |
| Packaging | Equally protective | Clear jar for a fragile active |
| Sunscreen | Its own tested SPF/UVA claim | "Same filters, so same SPF" |
When a dupe makes sense, and when it doesn't
Dupes are a great way to save on basics: moisturisers, cleansers, simple serums with well-known actives. Be more careful with sunscreen, with anything for sensitive or reactive skin that already tolerates the original, and with products where the exact concentration matters. When in doubt, patch-test the dupe first.
On Ratee you can scan both barcodes in the shop and compare their community scores, star breakdowns and most helpful reviews side by side. If you still can't decide, ask the community a question on the product page and hear from people who used it.
Scan the original and the dupe, and compare what real buyers say.
Frequently asked questions
- Is a product with the same ingredient list identical to the original?
- Not necessarily. An INCI list shows which ingredients are present and roughly in what order, but not exact percentages, raw material quality or how the product was made. Two products with near-identical lists can feel and perform differently, which is why reviews from people who tried both are useful.
- Are beauty dupes legal?
- Selling a product with a similar formula under its own brand is generally legal, although copying another brand's name, logo or packaging can break trademark law. Counterfeits, which pretend to be the original brand, are illegal in most countries. Rules vary, so buy from retailers you trust.
- Can I trust a cheaper sunscreen with the same filters?
- Only trust the SPF and UVA claims printed on the cheaper sunscreen's own label. Sun protection is measured by testing the finished product, and the same filters in a different formula can give different protection. A cheaper sunscreen can be excellent; its own tested label is what tells you.