{"product_id":"ref-stockholm-leave-in-serum","title":"REF Stockholm Leave-in Serum","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eA daily leave-in that does the work of several products: smooths the cuticle, seals split ends, adds luminous shine, detangles without effort, and provides heat protection — all in 1–3 pumps applied to towel-dried hair before styling. REF Stockholm Leave In Serum is part of the brand's premium Signature Collection, built around Organic Coconut Oil and a botanical active complex that delivers deep hydration without heaviness. The everyday essential for dry, damaged, or colour-treated hair that needs consistent care between washes, not just on treatment days.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eSignature Collection\u003c\/strong\u003e Leave In Serum sits within REF Stockholm's Signature Collection alongside Shine Elixir and the Detangling Spray — a premium tier enriched with exclusive nourishing ingredients. The Signature Collection is REF Stockholm's most concentrated expression of their Nature + Science philosophy. The Leave In Serum's hero Signature Collection ingredient is \u003cstrong\u003eOrganic Coconut Oil\u003c\/strong\u003e — a penetrating emollient with proven protein-loss prevention and deep moisturising properties, particularly effective for high-porosity and textured hair types.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eMechanism\u003c\/strong\u003e Leave In Serum is a water-based, rinse-free serum — an emulsion that delivers conditioning and protective actives in a lightweight, non-greasy base that absorbs into towel-dried hair without residue.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eCetearyl Alcohol\u003c\/strong\u003e and \u003cstrong\u003eCetyl Alcohol\u003c\/strong\u003e form the emollient conditioning base — fatty alcohols that provide the serum's creamy texture and deliver targeted cuticle-smoothing and detangling properties. \u003cstrong\u003eGuar Hydroxypropyltrimonium Chloride\u003c\/strong\u003e is a cationic guar that deposits at negatively charged damage points on the cuticle, providing targeted slip, combability, and anti-static frizz reduction. \u003cstrong\u003eCetrimonium Chloride\u003c\/strong\u003e provides additional cationic conditioning. \u003cstrong\u003eDimethicone\u003c\/strong\u003e delivers the surface smoothing, shine enhancement, and split-end sealing that are the most immediately visible benefits of the formula.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eCocos Nucifera (Coconut) Oil\u003c\/strong\u003e is the Signature Collection hero active — an emollient with an unusually small molecular structure that allows it to penetrate the hair shaft and prevent protein loss. REF Stockholm notes that Coconut Oil can deeply moisturise, prevent protein loss, and reduce hair damage, making it particularly effective for high-porosity hair (such as chemically processed, bleached, or textured hair) where the cuticle's gaps allow moisture to escape rapidly. \u003cstrong\u003eSimmondsia Chinensis (Jojoba) Seed Oil\u003c\/strong\u003e closely mimics the hair's natural sebum, absorbing without residue to add elasticity and shine. \u003cstrong\u003eHelianthus Annuus (Sunflower) Seed Extract\u003c\/strong\u003e provides UV and antioxidant protection.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eHydrolyzed Quinoa\u003c\/strong\u003e delivers the formula's protein reinforcement — the same REF Stockholm care signature seen across the range, providing amino acid and structural support at the hair surface. \u003cstrong\u003eSodium Methoxy PEG-16 Maleate\/Styrene Sulfonate Copolymer\u003c\/strong\u003e is a protective film-forming polymer from the same chemical family as the heat-protective polymer in REF Stockholm's Heat Protection N°230 — here providing a lightweight protective surface coating that seals moisture in the shaft and shields the cuticle from environmental stress and heat damage during blow-drying. \u003cstrong\u003eQuaternium-95\u003c\/strong\u003e provides anti-static conditioning. \u003cstrong\u003eHydroxyethylcellulose\u003c\/strong\u003e contributes to the formula's silky texture and film-forming smoothness.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eGlycerin\u003c\/strong\u003e and \u003cstrong\u003ePropylene Glycol\u003c\/strong\u003e provide the formula's humectant moisture-binding — drawing water into the hair shaft and maintaining hydration throughout the day. \u003cstrong\u003eButylene Glycol\u003c\/strong\u003e provides additional moisture-binding and penetration support.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe formula is tinted with \u003cstrong\u003eCI 75120 (Annatto)\u003c\/strong\u003e and \u003cstrong\u003eCI 16035 (Red 40)\u003c\/strong\u003e — natural and synthetic orange-red pigments that give the serum its characteristic warm amber colour. These do not deposit on the hair.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cem\u003eMetro Vancouver note:\u003c\/em\u003e Hard water mineral deposits create a barrier on the hair shaft that blocks leave-in products from absorbing fully — meaning a hydrating serum will underperform on hair with active mineral buildup. If results are inconsistent, a chelation step before your routine may significantly improve uptake. See our \u003ca href=\"https:\/\/zennkai.com\/pages\/hard-water-hair-damage\" title=\"Hard Water Hair Damage | Haircare Canada | Zennkai\"\u003eHard Water Hair Damage hub\u003c\/a\u003e for the protocol.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e Dry, damaged, colour-treated, bleached, or textured hair of any density. Particularly effective for high-porosity hair types — including Afro, coily, and repeatedly processed hair — where the penetrating properties of Coconut Oil directly address the moisture-loss mechanisms that other leave-ins can't reach. Apply to mid-lengths and ends only; avoid roots on fine hair to prevent over-softening.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cem\u003eNote: for frizzy hair without underlying dryness or damage, the \u003ca href=\"https:\/\/zennkai.com\/products\/ref-stockholm-shine-elixir\" title=\"REF Stockholm Shine Elixir | Buy in Canada | Zennkai\"\u003eShine Elixir\u003c\/a\u003e or \u003ca href=\"https:\/\/zennkai.com\/products\/ref-stockholm-heat-protection\" title=\"REF Stockholm Heat Protection N°230 | Buy in Canada | Zennkai\"\u003eHeat Protection N°230\u003c\/a\u003e may be more appropriate — the Leave In Serum's primary benefit is deep hydration and repair rather than frizz control specifically.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eKey Ingredients\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eCocos Nucifera (Organic Coconut) Oil\u003c\/strong\u003e — Signature Collection hero; penetrates the hair shaft to prevent protein loss, deeply moisturise, and reduce damage — particularly effective for high-porosity hair\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eSimmondsia Chinensis (Jojoba) Seed Oil\u003c\/strong\u003e — Sebum-mimicking emollient; adds elasticity and shine without residue\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eSodium Methoxy PEG-16 Maleate\/Styrene Sulfonate Copolymer\u003c\/strong\u003e — Protective film-forming polymer; seals moisture in the shaft and provides heat protection during blow-drying\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eDimethicone\u003c\/strong\u003e — Surface smoothing and shine; seals split ends and adds cuticle reflectivity\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eHydrolyzed Quinoa\u003c\/strong\u003e — Protein and amino acid reinforcement at the hair surface; builds structural resilience\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eGuar Hydroxypropyltrimonium Chloride\u003c\/strong\u003e — Cationic guar; targeted cuticle smoothing, detangling, and anti-static conditioning\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eGlycerin\u003c\/strong\u003e — Humectant; draws and retains moisture throughout the day\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eHow to Use\u003c\/strong\u003e Apply 1–3 pumps to towel-dried hair from mid-lengths to ends. Do not rinse. Style and blow-dry as desired, or air-dry. Adjust amount based on hair length and density: 1 pump for fine or short hair, 2–3 pumps for medium to long or thick hair.\u003c\/p\u003e","brand":"REF Stockholm","offers":[{"title":"125ml","offer_id":49774585512176,"sku":"7350016780384","price":44.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1253\/1225\/files\/REFStockholmLeave-inSerum.jpg?v=1779999606","url":"https:\/\/zennkai.com\/products\/ref-stockholm-leave-in-serum","provider":"Zennkai","version":"1.0","type":"link"}