{"product_id":"ilso-er-firming-serum-retinol-30ml-mirai-skin-ilso-er-firming-serum-retinol-30ml","title":"ilso ER Firming Serum (Retinol) 30ml","description":"\u003ch2\u003eilso ER Firming Serum (Retinol): Mid-Strength Retinol in a Clean Korean Serum\u003c\/h2\u003e\n\u003cp\u003eilso is a minimalist Korean skincare brand focused on active ingredient-forward formulations at mid-range prices. The ER Firming Serum is the brand's retinol product, positioned as a firming and anti-aging serum for intermediate users. The retinol is buffered with peptides and hydrating ingredients to reduce irritation while maintaining active effect. At $35.36 for 30ml, this is mid-tier retinol pricing, comparable to COSRX The Retinol 0.5 Oil but in a water-based serum format.\u003c\/p\u003e\n\u003cp\u003eRetinol in a serum format (vs oil) offers faster penetration and potentially more visible results for users with oily or combination skin. The trade-off is higher irritation risk during introduction. ilso's formulation buffers this with supportive ingredients: peptides for extra collagen signaling, niacinamide for barrier support, hydration humectants for texture. For users graduating from beginner retinol (0.1 to 0.25%) to more targeted treatment, this is a reasonable step up.\u003c\/p\u003e\n\u003ch3\u003eWhat It Does\u003c\/h3\u003e\n\u003cp\u003eRetinol converts to retinoic acid on skin, which upregulates collagen synthesis, accelerates cell turnover, and fades hyperpigmentation. Peptides add complementary collagen-stimulating signals. Niacinamide supports barrier function and brightens. Hydrating humectants buffer retinol's drying effect. Over 8 to 12 weeks: firmer skin, softened fine lines, improved texture.\u003c\/p\u003e\n\u003ch3\u003eWho It's For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntermediate retinol users:\u003c\/strong\u003e Graduating from lower concentrations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombination and oily skin:\u003c\/strong\u003e Serum format suits sebum-prone types.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEarly to mid anti-aging concerns:\u003c\/strong\u003e Fine lines, loss of firmness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsers who found oil-based retinol too rich:\u003c\/strong\u003e Serum alternative.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNot for beginners or pregnancy\/nursing.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Specs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVolume: 30ml\u003c\/li\u003e\n\u003cli\u003ePrice: $35.36\u003c\/li\u003e\n\u003cli\u003eHero ingredients: retinol, peptides, niacinamide\u003c\/li\u003e\n\u003cli\u003eTexture: serum\u003c\/li\u003e\n\u003cli\u003eFragrance: very light\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cp\u003ePM only. After cleansing and toner, dispense 2 to 3 drops, press across face. Avoid eye area and mouth corners. Wait 10 to 15 minutes, follow with moisturizer. Start 2 to 3 nights per week for 2 weeks, work up to 4 to 5 nights. Always SPF in the morning. Do not combine with AHA, BHA, or vitamin C on the same evening.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch4\u003eWhat's the retinol concentration?\u003c\/h4\u003e\n\u003cp\u003eilso doesn't publicly list the exact percentage. Based on formulation positioning, it's likely in the 0.25 to 0.5% range. Test for tolerance before assuming strength.\u003c\/p\u003e\n\u003ch4\u003eilso ER vs COSRX Retinol 0.5 Oil?\u003c\/h4\u003e\n\u003cp\u003eDifferent formats. COSRX is oil-based (slower penetration, less irritation, better for dry skin). ilso is serum-based (faster action, slightly more irritation risk, better for oily or combination skin). Choose on texture preference.\u003c\/p\u003e\n\u003ch4\u003eHow long until results?\u003c\/h4\u003e\n\u003cp\u003eTexture improvement: 4 to 6 weeks. Fine line softening: 8 to 12 weeks. Firmness: 12+ weeks.\u003c\/p\u003e\n\u003ch4\u003eCan I use it with niacinamide or hyaluronic acid?\u003c\/h4\u003e\n\u003cp\u003eYes. Niacinamide is safe to pair with retinol (despite older internet myths). Hyaluronic acid is a great buffer layer. Avoid AHA, BHA, vitamin C on the same night.\u003c\/p\u003e\n\u003ch4\u003eHow long does 30ml last?\u003c\/h4\u003e\n\u003cp\u003e3 to 4 months with 3 to 4 nights per week use.\u003c\/p\u003e\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cp\u003ePair with the ilso Sensitive Bubble Cleanser or browse Korean retinol.\u003c\/p\u003e\n","brand":"mirai-skin","offers":[{"title":"Default Title","offer_id":51741086875936,"sku":"52994465333620","price":17.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1004\/8333\/4432\/files\/40739a703839a632e283fc97b0f5ec92.webp?v=1779694812","url":"https:\/\/usmirai-skin.com\/products\/ilso-er-firming-serum-retinol-30ml-mirai-skin-ilso-er-firming-serum-retinol-30ml","provider":"usmirai-skin.com","version":"1.0","type":"link"}