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Weโre still tracking retailers for this one. In the meantime:
Segle Clinical's vitamin C serum โ 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 โ 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 50โ70%. The texture is genuinely light โ 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.
Other routine steps with complementary ingredients.
Side-by-side ingredient breakdowns vs. the closest alternatives.
In-clinic and at-home treatments that use the same active ingredients.

A 24-karat-gold-plated microchannel device that delivers custom serum cocktails โ usually micro-doses of Botox, hyaluronic acid, vitamins, and peptides โ into the upper dermis.

Microneedling's gentler, no-downtime sister โ a silicone-tip cartridge oscillating at ~150,000 vibrations/min that pushes serums into the epidermis without piercing the skin.

A cocktail of vitamins, amino acids, and hyaluronic acid injected into the superficial dermis โ French-born, globally adopted, endlessly remixed.
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Vital C Serum by Segle Clinical is formulated for normal, combination, dry, sensitive skin. Segle Clinical's vitamin C serum โ 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 โ 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 50โ70%. The texture is genuinely light โ 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.
The key active ingredients in Vital C Serum are Hyaluronic Acid, Panthenol, Vitamin C. It's known for: ethyl ascorbic acid is more stable than L-ascorbic acid โ no mid-bottle oxidation and Chlorella vulgaris plankton extract adds anti-stress antioxidant support.
Yes, Vital C Serum targets dullness, hyperpigmentation, fine lines. ethyl ascorbic acid is more stable than L-ascorbic acid โ no mid-bottle oxidation
Vital C Serum retails for around $33, which places it in the mid range for serums. Check the "Where to Buy" section above for current retailer prices.
The main drawbacks to be aware of: 5% vitamin C concentration is moderate โ not for aggressive brightening; no ferulic acid synergy (which SkinCeuticals leverages); minimal international availability โ mostly Spanish pharmacies and Amazon ES.
A suggested daily routine featuring this product, with complementary picks.
Ultime8 Sublime Beauty Cleansing Oil
Shu Uemura ยท cleanser
Gokujyun Premium Hyaluronic Acid Lotion
Hada Labo ยท toner
Vegan Kombucha Tea Essence
Dr. Ceuracle ยท essence
Vital C Serum
Segle Clinical ยท serum
Hydra-10 Cream
Segle Clinical ยท moisturizer
Anthelios UVMune 400 Invisible Fluid SPF50+
La Roche-Posay ยท sunscreen
Hydra-10 Cream
Segle Clinical ยท moisturizer