{"product_id":"principia-rn-03-retinol-serum","title":"Principia RN-0.3 Retinol Serum 0.3% + Vitamin E 0.5% for Fine Line \u0026 Firmness Care, 1.01 fl oz (30 mL)","description":"\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003e\u003cstrong\u003ePrincipia RN-0.3 \u003c\/strong\u003eis 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 \u003cspan class=\"font-semibold\"\u003e0.3% retinol\u003c\/span\u003e paired with \u003cspan class=\"font-semibold\"\u003e0.5% vitamin E\u003c\/span\u003e, 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003eThis serum is ideal for international customers, salon retail shelves, and resellers seeking a globally recognized active with clear concentration and a straightforward, professional story.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cspan class=\"font-semibold\"\u003e\u003cstrong\u003eFine line appearance care\u003c\/strong\u003e:\u003c\/span\u003e Helps soften the look of fine lines and expression lines with consistent use.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cspan class=\"font-semibold\"\u003e\u003cstrong\u003eFirmness + elasticity appearance\u003c\/strong\u003e:\u003c\/span\u003e Helps improve the look of firmness and elasticity over time.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eRadiance support:\u003c\/span\u003e\u003c\/strong\u003e Helps enhance the look of glow for a fresher, more luminous finish.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cspan class=\"font-semibold\"\u003e\u003cstrong\u003eTexture refinement\u003c\/strong\u003e:\u003c\/span\u003e Helps improve the look of uneven texture for a smoother surface appearance.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTone uniformity support:\u003c\/span\u003e\u003c\/strong\u003e Helps refine the look of uneven tone and discoloration.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cspan class=\"font-semibold\"\u003e\u003cstrong\u003ePore appearance support\u003c\/strong\u003e:\u003c\/span\u003e Helps reduce the look of enlarged pores as texture looks more refined.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cspan class=\"font-semibold\"\u003e\u003cstrong\u003eDermatologically tested (brand-reported)\u003c\/strong\u003e:\u003c\/span\u003e The brand reports irritation and sensitization testing, plus hypoallergenic \/ non-photoirritating evaluation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cspan class=\"font-semibold\"\u003eHow to use\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003eUse 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, \u003cspan class=\"font-semibold\"\u003eexcluding the eye area\u003c\/span\u003e.\u003cbr\u003eDuring the first week, use small amounts on alternate nights. Wear broad-spectrum sunscreen daily and avoid sun exposure without protection.\u003c\/p\u003e\n\u003cp\u003eIn a \u003cspan class=\"font-semibold\"\u003e60-day perceived efficacy study\u003c\/span\u003e, participants reported improvements in: \u003cspan class=\"font-semibold\"\u003eglow (100%)\u003c\/span\u003e, \u003cspan class=\"font-semibold\"\u003efine lines (97%)\u003c\/span\u003e, \u003cspan class=\"font-semibold\"\u003ewrinkles appearance (97%)\u003c\/span\u003e, \u003cspan class=\"font-semibold\"\u003etexture (97%)\u003c\/span\u003e, \u003cspan class=\"font-semibold\"\u003etone (97%)\u003c\/span\u003e, \u003cspan class=\"font-semibold\"\u003efirmness (87%)\u003c\/span\u003e, and \u003cspan class=\"font-semibold\"\u003eelasticity (87%)\u003c\/span\u003e. The brand also reports instrumental measurements showing variation in firmness and elasticity parameters over 60 days, plus comedogenicity\/acnegenicity evaluation. Results may vary.\u003c\/p\u003e\n\u003ch3\u003eIngredients Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cspan class=\"font-semibold\"\u003e\u003cstrong\u003eRetinol (0.3%)\u003c\/strong\u003e:\u003c\/span\u003e 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.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003e\n\u003cspan class=\"font-semibold\"\u003e\u003cstrong\u003eVitamin E (0.5%)\u003c\/strong\u003e:\u003c\/span\u003e 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.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003ch4\u003eAllergen warnings \/ cautions\u003c\/h4\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cul class=\"ml-1 list-outside list-disc\"\u003e\n\u003cli class=\"py-0\"\u003eFor external use only. Do not apply on irritated, broken, or compromised skin.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003eAvoid contact with eyes; do not apply in the eye area. If contact occurs, rinse thoroughly.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003eRetinol may cause temporary dryness, redness, or peeling; start slowly (alternate nights for the first week).\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003eUse broad-spectrum sunscreen daily and avoid sun exposure without protection.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003eIf pregnant or breastfeeding, consult a physician before use.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003eKeep out of reach of children. Do not use on children.\u003c\/li\u003e\n\u003cli class=\"py-0\"\u003eAccording to the brand, the formula is free from parabens, petrolatum, sulfates, silicones, fragrance, dyes, and gluten.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003ePrincipia\u003c\/span\u003e \u003c\/strong\u003eis a Brazilian \u003cstrong\u003edermocosmetics \u003c\/strong\u003ebrand founded in 2020 in São Paulo with a clear mission: \u003cspan class=\"font-semibold\"\u003edemocratize high-performance \u003cstrong\u003eskincare\u003c\/strong\u003e\u003c\/span\u003e\u003cstrong\u003e \u003c\/strong\u003ethrough 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—\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eactive ingredients at disclosed percentages\u003c\/span\u003e, straightforward formulations, and a minimalist, clinical aesthetic designed for everyday use.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eWhen should I use Principia RN-0.3?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse it at night only, on clean, dry skin, before moisturizer. Always wear sunscreen during the day.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eHow do I introduce retinol if I’m new to it?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStart with small amounts on alternate nights for the first week, then increase to nightly use as tolerated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCan I apply this retinol serum around my eyes?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The brand advises avoiding the eye area.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCan I use RN-0.3 with other active ingredients?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMany routines combine actives, but to reduce irritation, avoid layering multiple strong exfoliants in the same night. Consider alternating nights when using acids.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIs Principia cruelty-free?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe brand states it does not test on animals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"size-full [\u0026amp;\u0026gt;*:first-child]:mt-0 [\u0026amp;\u0026gt;*:last-child]:mb-0 space-y-2\"\u003e\n\u003cp\u003eComplete your routine by exploring \u003cspan class=\"text-gray-500\" title=\"Blocked URL: {{INTERNAL_LINK}}\"\u003eour curated \u003ca href=\"https:\/\/mkpbr.com\/collections\/principia\"\u003ePrincipia Collection\u003c\/a\u003e\u003c\/span\u003e for a clean, balanced, everyday glow.\u003c\/p\u003e\n\u003ch3\u003eAdd Principia RN-0.3 to your cart and elevate your night routine with Brazilian dermocosmetic precision.\u003c\/h3\u003e\n\u003ch4\u003eLegal Disclaimer\u003c\/h4\u003e\n\u003cp\u003e⚠️ 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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Principia","offers":[{"title":"Default Title","offer_id":52626387042620,"sku":"MKPBR2024-1974","price":54.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0090\/2840\/3278\/files\/principia-rn-0-3-retinol-serum-0-3-percent-vitamin-e-0-5-percent-1-01-fl-oz-30-ml-front-bottle-buy-now-at-mkpbr-com-worldwide-shipping.png?v=1768396617","url":"https:\/\/mkpbr.com\/en-at\/products\/principia-rn-03-retinol-serum","provider":"MKPBR - Shine Like a Brazilian","version":"1.0","type":"link"}