Principia C-10 Vitamin C Serum 10% + Ferulic Acid 0.5% for Brightening & Fine Line Care, 1.01 fl oz (30 mL)
Principia C-10 is a Brazilian dermocosmetics serum designed to bring elegance and performance to daily skincare. With 10% vitamin C paired with 0.5% ferulic acid, this refined formula supports a brighter-looking complexion, smoother-looking texture, and the appearance of more even tone—while helping soften the look of fine lines.
Lightweight and easy to layer, it fits seamlessly into professional routines, salon retail selections, and international reseller catalogs that value clear active concentrations and a modern, minimalist approach.
Key Benefits
- Dark spot appearance support: Helps reduce the appearance of dark marks and supports a more even-looking complexion.
- Fine line look softening: Helps smooth the appearance of fine lines for a more refined finish.
- Texture refinement: Helps improve the look of uneven texture for a smoother-looking surface.
- Under-eye radiance support: May help improve the appearance of under-eye darkness and puffiness with consistent use.
- Glow support: Helps enhance the look of radiance for a fresh, luminous finish.
- Pore appearance support: Helps reduce the look of enlarged pores over time.
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Dermatologically tested (brand-reported): The brand reports irritation and sensitization testing, plus hypoallergenic and non-photoirritating evaluation.
How to use
Use daily, morning and night. Apply on clean, dry skin before creams, sunscreen, and makeup. Dispense a few drops onto fingertips (avoid touching the dropper to skin) and spread gently over the face, including the eye area if tolerated. Avoid direct contact with eyes. Store in a cool, dry place. Wear sunscreen daily.
In a 60-day perceived efficacy study, participants reported improvements in: softness (100%), glow (93%), fine lines (90%), tone (90%), pore size appearance (90%), melasma appearance (83%), dark spots (83%), under-eye dark circles (80%), and under-eye puffiness (80%). The brand also reports comedogenicity/acnegenicity evaluation over 60 days.
Ingredients Highlights
- Vitamin C (10%): A key antioxidant nutrient that helps protect the skin from the visible effects of oxidative stress, including those associated with sun exposure. In topical skincare, vitamin C is widely used to support a brighter look, help reduce the appearance of hyperpigmentation, and support collagen-related pathways that contribute to firmer-looking skin and smoother-looking fine lines. Vitamin C can exist in different forms; some derivatives offer improved stability and may convert on the skin.
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Ferulic Acid (0.5%): A plant-derived antioxidant found in seeds, leaves, and bark. Ferulic acid is valued in skincare for its antioxidant and soothing support, helping protect key skin components such as keratinocytes, fibroblasts, collagen, and elastin—making it an excellent partner ingredient in antioxidant routines.
Allergen warnings / cautions
- For external use only. Discontinue use if irritation occurs.
- Avoid direct contact with eyes; rinse thoroughly if contact occurs.
- Avoid sun exposure without protection; use broad-spectrum sunscreen daily.
- Do not use on children.
- Store in a cool, dry place.
- According to the brand, the formula is free from parabens, petrolatum, silicones, fragrance, and gluten.
Principia is a Brazilian dermocosmetics brand founded in 2020 in São Paulo with a clear mission: democratize high-performance skincare through science-backed formulas, radical ingredient transparency, and fair, accessible positioning. Instead of relying on hype, Principia focuses on what matters most for results-driven routines—active ingredients at disclosed percentages, straightforward formulations, and a minimalist, clinical aesthetic designed for everyday use.
FAQ
Can I use Principia C-10 every day?
Yes. The brand indicates daily AM/PM use. If your skin is sensitive, start once daily and increase as tolerated.
Do I need sunscreen when using vitamin C?
Yes. Daily broad-spectrum sunscreen helps protect the look of results and supports a more even-looking tone.
Can this serum help with the look of dark spots and uneven tone?
It may help improve the appearance of dark marks and tone irregularities with consistent use, alongside sun protection.
Can I apply it around the eye area?
The brand indicates safety and efficacy were evaluated for the eye area. Apply gently and avoid direct contact with eyes.
Will it cause visible peeling?
The brand indicates it generally does not cause visible peeling. If irritation occurs, reduce frequency and support with a moisturizer.
Complete your routine by exploring our curated Principia Collection for a clean, balanced, everyday glow.
Add Principia C-10 to your cart and elevate your skincare ritual with Brazilian dermocosmetic radiance.
Legal Disclaimer
⚠️ The product label may contain additional or different information than stated on the website. Always read labels, warnings, and usage instructions before using or consuming.