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Dupes for The Inkey List Starter Retinol Serum Duo

A formula alternative, not an identical product.

Starter Retinol Serum Duo

your reference

$24.70

Only serum matches are shown.

What matters most?

picking by how much of the original's full ingredient list is shared · log in and set a skin profile to use this.

Keep

Closest formulas, not dupes

These share part of the formula or one hero active — shown so you can judge for yourself.

Candidates share at least three label ingredients with Starter Retinol Serum Duo. Common bases are down-weighted, meaningful actives count more, and this view is scoped to the same product type. Commissions never affect order.

Compare the top matches side by side →

How we match

Hero actives first. We compare the meaningful actives named on the original’s label. Ubiquitous bases — water, glycerin, hyaluronic acid, butylene glycol — are never treated as evidence that two formulas do the same job.

Then the rest of the list. How many of the original’s ingredients also appear on the other label, always shown as a count against the original’s own length — never a headline number on its own. Candidates share at least three label ingredients with the original, common bases are down-weighted, and meaningful actives count more.

Price. Savings compare the best real offer we hold for each product, or its catalog price when there is no offer, and only within one currency. Commissions never affect the order of this list.

Your profile. Signed in, rows also mark ingredients you told us to avoid and the goals you set. That changes what is highlighted and what is ranked first — never which products qualify, and never what anyone else sees.

method v2 · 2026-08-30 — tiers replace the single 50%-share floor; same-brand aliases collapsed; hero actives exclude commodity humectants; sunscreens are never called dupes; labels under 10 ingredients are never called dupe sources.

More formulas from The Inkey List

Other products from the same brand that share decoded ingredients with Starter Retinol Serum Duo — related formulas, not dupes.