Principia RN-0.3 Retinol Serum 0.3% + Vitamin E 0.5% for Fine Line & Firmness Care, 1.01 fl oz (30 mL)
Principia RN-0.3 is a Brazilian dermocosmetics night serum designed for a refined, results-focused routine—supporting the look of smoother texture, improved radiance, and visibly softened fine lines over time. With 0.3% retinol paired with 0.5% vitamin E, it brings an elegant balance of renewal and antioxidant support, making it a strong fit for customers who want a high-performance anti-aging step that still feels modern, minimal, and easy to integrate.
This serum is ideal for international customers, salon retail shelves, and resellers seeking a globally recognized active with clear concentration and a straightforward, professional story.
Key Benefits
- Fine line appearance care: Helps soften the look of fine lines and expression lines with consistent use.
- Firmness + elasticity appearance: Helps improve the look of firmness and elasticity over time.
- Radiance support: Helps enhance the look of glow for a fresher, more luminous finish.
- Texture refinement: Helps improve the look of uneven texture for a smoother surface appearance.
- Tone uniformity support: Helps refine the look of uneven tone and discoloration.
- Pore appearance support: Helps reduce the look of enlarged pores as texture looks more refined.
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Dermatologically tested (brand-reported): The brand reports irritation and sensitization testing, plus hypoallergenic / non-photoirritating evaluation.
How to use
Use daily, only at night. Apply on clean, dry skin before creams. Dispense a few drops onto fingertips (avoid touching the dropper to skin) and spread gently over the face, excluding the eye area.
During the first week, use small amounts on alternate nights. Wear broad-spectrum sunscreen daily and avoid sun exposure without protection.
In a 60-day perceived efficacy study, participants reported improvements in: glow (100%), fine lines (97%), wrinkles appearance (97%), texture (97%), tone (97%), firmness (87%), and elasticity (87%). The brand also reports instrumental measurements showing variation in firmness and elasticity parameters over 60 days, plus comedogenicity/acnegenicity evaluation. Results may vary.
Ingredients Highlights
- Retinol (0.3%): A vitamin A derivative whose molecules can penetrate deeper layers of the skin. Retinol is widely used to support antioxidant activity and to promote collagen- and elastin-related pathways that help improve the look of fine lines, firmness, elasticity, and radiance. It also supports surface renewal, helping refine the look of texture and uneven tone over time.
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Vitamin E (0.5%): An antioxidant naturally found in foods like nuts, spinach, and olive oil. In skincare, vitamin E helps neutralize free radicals and is associated with photoprotective support, helping reduce the visible effects of sun-related stress when paired with daily sunscreen.
Allergen warnings / cautions
- For external use only. Do not apply on irritated, broken, or compromised skin.
- Avoid contact with eyes; do not apply in the eye area. If contact occurs, rinse thoroughly.
- Retinol may cause temporary dryness, redness, or peeling; start slowly (alternate nights for the first week).
- Use broad-spectrum sunscreen daily and avoid sun exposure without protection.
- If pregnant or breastfeeding, consult a physician before use.
- Keep out of reach of children. Do not use on children.
- According to the brand, the formula is free from parabens, petrolatum, sulfates, silicones, fragrance, dyes, 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
When should I use Principia RN-0.3?
Use it at night only, on clean, dry skin, before moisturizer. Always wear sunscreen during the day.
How do I introduce retinol if I’m new to it?
Start with small amounts on alternate nights for the first week, then increase to nightly use as tolerated.
Can I apply this retinol serum around my eyes?
No. The brand advises avoiding the eye area.
Can I use RN-0.3 with other active ingredients?
Many routines combine actives, but to reduce irritation, avoid layering multiple strong exfoliants in the same night. Consider alternating nights when using acids.
Is Principia cruelty-free?
The brand states it does not test on animals.
Complete your routine by exploring our curated Principia Collection for a clean, balanced, everyday glow.
Add Principia RN-0.3 to your cart and elevate your night routine with Brazilian dermocosmetic precision.
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