Principia RN-0.3 Retinol Serum 0.3% + Vitamin E 0.5% for Fine Line & Firmness Care, 1.01 fl oz (30 mL)
- A lightweight night serum formulated with Retinol 0.3% and Vitamin E 0.5% that supports the look of smoother, more refined skin texture with continued nightly use.
Those who want to support the appearance of fine lines and uneven skin texture Suitable for adults beginning or maintaining a retinol routine For evening use only — apply after cleansing and before moisturiser
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- 0.3% Retinol to help support the look of smoother skin texture
- 0.5% Vitamin E to help nourish and condition the skin
- Lightweight serum texture that absorbs readily
- Formulated for nightly use as part of a skincare routine
Apply a pea-sized amount to cleansed, dry skin in the evening Gently smooth over face and neck, avoiding the eye area Follow with your usual moisturiser Use SPF during the day when using retinol products
- For evening use only
- Always apply SPF the following morning — sunlight exposure may affect skin condition
- Introduce gradually: start 2–3 nights per week, building up as tolerated
- Avoid use with other retinol-containing products
- Keep out of reach of children
Retinol 0.3% works on the look of skin texture while Vitamin E supports and conditions — together they form a nightly routine step aimed at the appearance of smoother, more refined skin over time.
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Learn morePrincipia RN-0.3
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.
Why you’ll love it
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.
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.
Product highlights
Product information
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.
