ISDIN vs Segle Clinical — side by side, no bias.
Our pick
Isdinceutics Retinal Intense
9/10 · ISDIN
| Isdinceutics Retinal Intense | Vital C Serum | |
|---|---|---|
| Brand | ISDIN | Segle Clinical |
| Category | serum | serum |
| Editor Rating | 9/10 ★ | 8.3/10 |
| Category | serum | serum |
| Texture | Concentrated serum | Lightweight liquid serum |
| Finish | Smooth, absorbed | Brightened, hydrated, radiant |
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| Verdict | ISDIN's retinaldehyde powerhouse — a step above retinol in the vitamin A hierarchy. Retinal (retinaldehyde) converts to retinoic acid in one step instead of two, meaning faster results with less irritation than prescription tretinoin. ISDIN pairs it with HPR (hydroxypinacolone retinoate) for a dual-retinoid approach, plus bakuchiol as a botanical synergist and hyaluronic acid for hydration. The Spanish derm brand's most serious anti-aging product. | Segle Clinical's vitamin C serum — and the reason Spanish pharmacists reach for this brand when customers ask for brightening. The formulation uses ethyl ascorbic acid (5%) instead of L-ascorbic acid, a deliberate choice: it's more stable (no oxidation within weeks of opening), penetrates well, and converts to active ascorbic acid in the skin. The supporting cast is smart — hyaluronic acid for hydration, panthenol for barrier support, and Chlorella vulgaris extract (the brand's signature marine plankton ingredient) as an anti-stress antioxidant. At ~$33 for 30ml, it undercuts comparable stable-C serums from international brands by 50–70%. The texture is genuinely light — a watery liquid that absorbs in seconds without residue, layering cleanly under sunscreen. Not the most potent vitamin C on the market (La Roche-Posay Pure Vitamin C10 or SkinCeuticals C E Ferulic deliver higher concentrations), but the stability advantage means you're actually getting the stated percentage throughout the bottle's life. |
