Serum C.

Serum C delivers pure L-ascorbic acid past the skin's surface and into the dermis, where fibroblasts actually produce collagen and elastin. On its own, Vitamin C brightens and evens skin tone, brightening dark spots, softening fine lines, and restoring the kind of glow that comes from cellular function, not makeup.

The formulation uses Dr. Ronlán's proprietary stabilization system, a delivery vehicle that protects the Vitamin C from oxidation and carries it intact through the stratum corneum. It's why our serum doesn't turn orange, and why the lower 10% concentration outperforms the 20% aqueous formulas other brands rely on.

"The easier version is to add water, lower the concentration, and add preservatives. We've turned that down for thirty years."

Serum C is the foundation of the Transderma system: the first serum most customers buy, and the one that tends to convince them of the rest. Used alone, it's a complete routine. Stacked with Serum A at night or Serum M for moisture, it becomes a system.

Every ingredient here has a job. There is no water, no thickener, no fragrance, no preservative, because there's no contamination risk to preserve against. The airless bottle takes care of that.

Apply to clean, dry skin. Allow one to five minutes for the serum to absorb. Layer with Serum M if your skin needs moisture, allow to absorb completely, then continue with your daily routine. Morning preferred.