{"product_id":"principia-c-10-vitamin-c-serum","title":"Principia C-10 Vitamin C Serum 10% + Ferulic Acid 0.5% for Brightening \u0026 Fine Line Care, 1.01 fl oz (30 mL)","description":"\u003cstyle\u003e\n  .mkpbr-adeus {\n    --mkpbr-orange: #ff6b4a;\n    --mkpbr-orange-dark: #e85a37;\n    --mkpbr-black: #111111;\n    --mkpbr-muted: #666666;\n    --mkpbr-soft: #faf9f7;\n    --mkpbr-line: #ececec;\n    --mkpbr-white: #ffffff;\n    color: var(--mkpbr-black);\n    font-family: inherit;\n    font-size: 16px;\n    line-height: 1.65;\n  }\n\n  .mkpbr-adeus *,\n  .mkpbr-adeus *::before,\n  .mkpbr-adeus *::after {\n    box-sizing: border-box;\n  }\n\n  .mkpbr-adeus h2,\n  .mkpbr-adeus h3,\n  .mkpbr-adeus p {\n    margin-top: 0;\n  }\n\n  .mkpbr-adeus h2 {\n    margin-bottom: 14px;\n    color: var(--mkpbr-black);\n    font-size: clamp(24px, 4vw, 34px);\n    line-height: 1.2;\n  }\n\n  .mkpbr-adeus h3 {\n    margin-bottom: 8px;\n    color: var(--mkpbr-black);\n    font-size: 18px;\n    line-height: 1.35;\n  }\n\n  .mkpbr-adeus a {\n    color: var(--mkpbr-orange-dark);\n    font-weight: 600;\n    text-underline-offset: 3px;\n  }\n\n  .mkpbr-adeus__intro {\n    padding: clamp(24px, 5vw, 42px);\n    border-left: 5px solid var(--mkpbr-orange);\n    border-radius: 0 16px 16px 0;\n    background: var(--mkpbr-soft);\n  }\n\n  .mkpbr-adeus__intro p {\n    max-width: 820px;\n    margin-bottom: 0;\n    color: var(--mkpbr-muted);\n    font-size: 17px;\n  }\n\n  .mkpbr-adeus__section {\n    padding: 34px 0;\n    border-bottom: 1px solid var(--mkpbr-line);\n  }\n\n  .mkpbr-adeus__section-title {\n    margin-bottom: 18px;\n    font-size: 24px;\n  }\n\n  .mkpbr-adeus__grid {\n    display: grid;\n    grid-template-columns: repeat(2, minmax(0, 1fr));\n    gap: 14px;\n  }\n\n  .mkpbr-adeus__card {\n    padding: 20px;\n    border: 1px solid var(--mkpbr-line);\n    border-radius: 14px;\n    background: var(--mkpbr-white);\n  }\n\n  .mkpbr-adeus__card p {\n    margin-bottom: 0;\n    color: var(--mkpbr-muted);\n  }\n\n  .mkpbr-adeus__steps {\n    display: grid;\n    grid-template-columns: repeat(3, minmax(0, 1fr));\n    gap: 14px;\n    margin: 0;\n    padding: 0;\n    list-style: none;\n    counter-reset: adeus-step;\n  }\n\n  .mkpbr-adeus__steps li {\n    position: relative;\n    padding: 54px 18px 18px;\n    border-radius: 14px;\n    background: var(--mkpbr-soft);\n    counter-increment: adeus-step;\n  }\n\n  .mkpbr-adeus__steps li::before {\n    position: absolute;\n    top: 16px;\n    left: 18px;\n    display: grid;\n    width: 28px;\n    height: 28px;\n    place-items: center;\n    border-radius: 50%;\n    background: var(--mkpbr-orange);\n    color: var(--mkpbr-white);\n    content: counter(adeus-step);\n    font-size: 14px;\n    font-weight: 700;\n  }\n\n  .mkpbr-adeus__steps strong {\n    display: block;\n    margin-bottom: 5px;\n  }\n\n  .mkpbr-adeus__tags {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 9px;\n    margin: 16px 0;\n  }\n\n  .mkpbr-adeus__tag {\n    padding: 7px 12px;\n    border: 1px solid var(--mkpbr-line);\n    border-radius: 999px;\n    background: var(--mkpbr-soft);\n    font-size: 14px;\n  }\n\n  .mkpbr-adeus__notice {\n    margin-top: 18px;\n    padding: 16px 18px;\n    border-radius: 12px;\n    background: #fff2ee;\n    color: #552217;\n  }\n\n  .mkpbr-adeus__details {\n    border-top: 1px solid var(--mkpbr-line);\n  }\n\n  .mkpbr-adeus__details details {\n    border-bottom: 1px solid var(--mkpbr-line);\n  }\n\n  .mkpbr-adeus__details summary {\n    position: relative;\n    padding: 18px 42px 18px 0;\n    cursor: pointer;\n    color: var(--mkpbr-black);\n    font-weight: 700;\n    list-style: none;\n  }\n\n  .mkpbr-adeus__details summary::-webkit-details-marker {\n    display: none;\n  }\n\n  .mkpbr-adeus__details summary::after {\n    position: absolute;\n    top: 50%;\n    right: 4px;\n    color: var(--mkpbr-orange);\n    content: \"+\";\n    font-size: 24px;\n    font-weight: 500;\n    transform: translateY(-50%);\n  }\n\n  .mkpbr-adeus__details details[open] summary::after {\n    content: \"\\2212\";\n  }\n\n  .mkpbr-adeus__details-body {\n    padding: 0 36px 18px 0;\n    color: var(--mkpbr-muted);\n  }\n\n  .mkpbr-adeus__details-body p:last-child {\n    margin-bottom: 0;\n  }\n\n  .mkpbr-adeus__disclaimer {\n    margin-top: 28px;\n    padding: 18px;\n    border: 1px solid var(--mkpbr-line);\n    border-radius: 12px;\n    color: var(--mkpbr-muted);\n    font-size: 13px;\n  }\n\n  @media (max-width: 749px) {\n    .mkpbr-adeus__grid,\n    .mkpbr-adeus__steps {\n      grid-template-columns: 1fr;\n    }\n\n    .mkpbr-adeus__section {\n      padding: 28px 0;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"mkpbr-adeus\"\u003e\n\u003csection class=\"mkpbr-adeus__intro\"\u003e\n\u003ch2\u003ePrincipia C-10\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePrincipia C-10 \u003c\/strong\u003eis 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.\u003cbr\u003e\u003cbr\u003eLightweight 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.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"mkpbr-adeus__section\"\u003e\n\u003ch2 class=\"mkpbr-adeus__section-title\"\u003eWhy you’ll love it\u003c\/h2\u003e\n\n\u003cdiv class=\"mkpbr-adeus__grid\"\u003e\n\u003cdiv class=\"mkpbr-adeus__card\"\u003e\n\u003ch3\u003eDark spot appearance support\u003c\/h3\u003e\n\u003cp\u003eHelps reduce the appearance of dark marks and supports a more even-looking complexion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mkpbr-adeus__card\"\u003e\n\u003ch3\u003eFine line look softening\u003c\/h3\u003e\n\u003cp\u003eHelps smooth the appearance of fine lines for a more refined finish.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mkpbr-adeus__card\"\u003e\n\u003ch3\u003eTexture refinement\u003c\/h3\u003e\n\u003cp\u003eHelps improve the look of uneven texture for a smoother-looking surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mkpbr-adeus__card\"\u003e\n\u003ch3\u003eUnder-eye radiance support\u003c\/h3\u003e\n\u003cp\u003eMay help improve the appearance of under-eye darkness and puffiness with consistent use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mkpbr-adeus__card\"\u003e\n\u003ch3\u003eGlow support\u003c\/h3\u003e\n\u003cp\u003eHelps enhance the look of radiance for a fresh, luminous finish.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mkpbr-adeus__card\"\u003e\n\u003ch3\u003ePore appearance support\u003c\/h3\u003e\n\u003cp\u003eHelps reduce the look of enlarged pores over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mkpbr-adeus__card\"\u003e\n\u003ch3\u003eDermatologically tested (brand-reported)\u003c\/h3\u003e\n\u003cp\u003eThe brand reports irritation and sensitization testing, plus hypoallergenic and non-photoirritating evaluation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"mkpbr-adeus__section\"\u003e\n\u003ch2 class=\"mkpbr-adeus__section-title\"\u003eHow to use\u003c\/h2\u003e\n\n\u003cp\u003eUse 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.\u003cbr\u003e\u003cbr\u003eIn 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.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"mkpbr-adeus__section\"\u003e\n\u003ch2 class=\"mkpbr-adeus__section-title\"\u003eProduct highlights\u003c\/h2\u003e\n\u003cdiv class=\"mkpbr-adeus__tags\"\u003e\n\u003cspan class=\"mkpbr-adeus__tag\"\u003eVitamin 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.\u003c\/span\u003e \u003cspan class=\"mkpbr-adeus__tag\"\u003eFerulic 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.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mkpbr-adeus__notice\"\u003e\n\u003cstrong\u003eAllergen warnings \/ cautions:\u003c\/strong\u003e 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.\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"mkpbr-adeus__section\"\u003e\n\u003ch2 class=\"mkpbr-adeus__section-title\"\u003eProduct information\u003c\/h2\u003e\n\u003cdiv class=\"mkpbr-adeus__details\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use Principia C-10 every day?\u003c\/summary\u003e\n\u003cdiv class=\"mkpbr-adeus__details-body\"\u003e\n\u003cp\u003eYes. The brand indicates daily AM\/PM use. If your skin is sensitive, start once daily and increase as tolerated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need sunscreen when using vitamin C?\u003c\/summary\u003e\n\u003cdiv class=\"mkpbr-adeus__details-body\"\u003e\n\u003cp\u003eYes. Daily broad-spectrum sunscreen helps protect the look of results and supports a more even-looking tone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this serum help with the look of dark spots and uneven tone?\u003c\/summary\u003e\n\u003cdiv class=\"mkpbr-adeus__details-body\"\u003e\n\u003cp\u003eIt may help improve the appearance of dark marks and tone irregularities with consistent use, alongside sun protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I apply it around the eye area?\u003c\/summary\u003e\n\u003cdiv class=\"mkpbr-adeus__details-body\"\u003e\n\u003cp\u003eThe brand indicates safety and efficacy were evaluated for the eye area. Apply gently and avoid direct contact with eyes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill it cause visible peeling?\u003c\/summary\u003e\n\u003cdiv class=\"mkpbr-adeus__details-body\"\u003e\n\u003cp\u003eThe brand indicates it generally does not cause visible peeling. If irritation occurs, reduce frequency and support with a moisturizer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv class=\"mkpbr-adeus__disclaimer\"\u003e\n\u003cstrong\u003eDisclaimer:\u003c\/strong\u003e For external use only. Patch test before use and discontinue use if irritation occurs. Individual results may vary. Product packaging may be labeled in Portuguese. Our Brazilian-brand products are sourced in Brazil and are regularized with ANVISA (Agência Nacional de Vigilância Sanitária), Brazil's national health authority, under the applicable regulatory framework for each product category. ANVISA regularization applies to the Brazilian market and is not equivalent to U.S. FDA approval. See our full \u003ca href=\"\/en-se\/pages\/disclaimers\"\u003eDisclaimers \u0026amp; Important Information\u003c\/a\u003e.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Principia","offers":[{"title":"Default Title","offer_id":52626228379964,"sku":"MKPBR2024-1972","price":265.18,"currency_code":"SEK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0090\/2840\/3278\/files\/principia-c-10-vitamin-c-serum-10-percent-ferulic-acid-0-5-percent-1-01-fl-oz-30-ml-front-bottle-buy-now-at-mkpbr-com-worldwide-shipping_46546b1d-04b5-481f-8edb-6bd017ebc14f.png?v=1784527155","url":"https:\/\/mkpbr.com\/en-se\/products\/principia-c-10-vitamin-c-serum","provider":"MKPBR - Shine Like a Brazilian","version":"1.0","type":"link"}