Medik8
4 active ingredients identified. We flag active ingredients based on common cosmetic-use and formulation patterns. This is informational only and not medical advice.
No pricing data available yet for Medik8 Crystal Retinal 6
Exact science-based dupes appear first. When a strict dupe is not available yet, we still show the closest active-match alternatives from the same product category.
Drunk Elephant · prestige
This uses retinol, not retinal (the more potent, direct-acting form Medik8 uses), so despite matching support ingredients like squalane and tocopherol, the core active is a weaker, different molecule requiring conversion in skin.
No price

the ordinary · mid-range
Contains retinol at 0.5%, not the retinal used in Crystal Retinal 6, so it's a milder, different-generation retinoid despite some shared antioxidant ingredients.
No price

Ordinary · drugstore
Uses retinol instead of retinal and lacks tocopherol, making it a chemically different and generally weaker retinoid product despite the higher 1% labeling.
No price

The Inkey List · drugstore
Simple retinol formula missing both the retinal active and the tocopherol antioxidant found in the source, making it a much more basic and likely less potent product.
No price
Murad · drugstore
Relies on retinol and retinyl propionate rather than retinal, so the active retinoid chemistry differs significantly despite added niacinamide for other benefits.
No price
We rank results with INCI-level analysis first, then fall back to the strongest active matches and closest alternatives so every product page still shows comparable options. Fallbacks stay within the same category as the source product, so cleansing balms only surface cleanser dupes instead of adjacent product types. Active Match % measures shared science-backed actives. Formula Similarity % measures total ingredient overlap when full INCI lists are available.