Our original 20% L-ascorbic acid serum, boosted with ferulic acid and hyaluronic acid. Blended in small batches and hand-dated — so the vitamin C reaches your skin at full strength, not months past its prime. Why fresh matters L-ascorbic acid is the most studied, most effective form of vitamin C — and the least stable. Once it's mixed, it slowly oxidizes into a form your skin can't use. That's why a serum bottled months ago on a warehouse shelf isn't the same as one blended in a small batch and hand-dated. What it does Brightens & evens tone. Helps target dark spots, sun marks and dullness for a more even, lit-from-within look. Supports firmness. Vitamin C is a key cofactor in your skin's own collagen production — which, with time, helps soften the look of fine lines. Antioxidant defense. Ferulic acid works alongside vitamin C to help neutralize free radicals from pollution and daylight before they age skin. Key ingredients L-Ascorbic Acid — The pure, active form of vitamin C — the one with the deepest research behind brightening, firmness and antioxidant protection. Ferulic Acid — A plant antioxidant that helps stabilize vitamin C and amplifies its defense against environmental stress. Hyaluronic Acid — Draws in moisture so the serum hydrates and cushions rather than leaving skin tight. Panthenol (Pro-Vitamin B5) — Soothing and conditioning — helps keep an active serum comfortable on daily use. Full ingredients: Purified Water, 20% L-Ascorbic Acid, Ethoxydiglycol, DL-Panthenol, Glycerin, Magnesium Sulfate, Ferulic Acid, Sodium Hyaluronate, Sodium PCA. How to use Cleanse skin. Apply 5–6 drops. Pat gently over the face and neck. A mild, warm tingle is normal at first. Let it absorb for a minute. Follow with moisturizer, and sunscreen every morning. New to vitamin C? Start every other day and build up. Patch test first if your skin is sensitive. Keep the cap tight and store in a cool, dark place — refrigerate unopened bottles. If the serum turns deep amber, it has oxidized and it's time for a fresh one. Vitamin C works best with daily sunscreen We don't sell sunscreen, but it's the one step that protects everything this serum works toward. Without daily SPF, UV light breaks vitamin C down, drives new dark spots and speeds collagen loss — so your serum is left fighting an uphill battle. With it, you lock in and protect your progress. What to look for in a sunscreen: Broad-spectrum — protects against both UVA (aging) and UVB (burning) rays. SPF 30 or higher — blocks about 97% of UVB; don't drop below 30. Every morning — apply as the last step after your serum, and reapply every two hours in the sun. A texture you'll actually wear — mineral (zinc oxide, titanium dioxide) or a modern chemical filter; pick one that feels good so you use it daily. FAQ What makes a fresh vitamin C serum different?L-ascorbic acid is highly effective but unstable — it oxidizes over time, especially once mixed into water. Because we blend in small batches and hand-date every bottle, the vitamin C reaches your skin at full strength instead of partway through its decline. How is the C20 Ferulic different from the original C20?Both use 20% L-ascorbic acid. The Ferulic version adds ferulic acid for extra antioxidant defense plus hyaluronic acid and panthenol for more hydration and comfort — a great pick if you want a bit more cushion and everyday resilience. Will it sting or tingle?A mild, warm tingle when you first apply is normal with active vitamin C at this strength. If you're new to it or have sensitive skin, start every other day and patch test first. Persistent irritation means it's not the right strength for you — try our gentler C10 or C15 MAP. How should I store it, and how long does it last?Keep the cap closed and store in a cool, dark spot; refrigerate unopened bottles to extend freshness. Once opened, use it within about three months. A deep amber color is your signal it has oxidized and it's time for a fresh bottle. When should I apply it?Most people use it once daily on clean skin in the morning, always followed by a broad-spectrum sunscreen — that's what protects the brightening results your serum is working toward. What if it doesn't work for me?You're covered by our 30-day money-back guarantee. Contact us within 30 days of delivery and we'll refund you in full — no need to return the bottle. Small-batch · Hand-dated · Shipped from Colorado · 30-day money-back guarantee · Free U.S. shipping over $50.
