A softer 10% L-ascorbic acid serum for sensitive skin and vitamin C beginners. Same small-batch, hand-dated quality as our stronger serums — just an easier place to start. Why fresh matters Starting lower is the smart way to introduce vitamin C — but a low strength that's also gone stale barely does anything. We blend your C10 in small batches and hand-date it, so a gentle 10% still delivers real, active vitamin C to your skin. What it does Gentle enough for daily use. At 10%, most sensitive and reactive skin can use it every day with little to no tingle. Brightens & smooths. Helps soften the look of dullness and dark spots for a clearer, more even-looking glow. Supports collagen. Vitamin C helps your skin build collagen, softening the look of fine lines over time. Key ingredients L-Ascorbic Acid — A gentler dose of the active form of vitamin C — effective for brightening and antioxidant support with less risk of stinging. Glycerin — A soothing humectant that keeps the serum hydrating and comfortable. Full ingredients: Purified Water, 10% L-Ascorbic Acid, Magnesium Sulfate, Glycerin. How to use Cleanse skin. Apply 5–6 drops. Pat gently over the face and neck. Little to no tingle at this strength. Let it absorb for a minute. Follow with moisturizer, and sunscreen every morning. Perfect for beginners. You can usually use C10 daily right away, but patch test first if your skin is very reactive. Keep the cap tight and store cool and dark — refrigerate unopened bottles. If the serum turns deep amber, it's oxidized and 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 Who is C10 best for?Anyone with sensitive or reactive skin, or anyone brand-new to vitamin C. The lower 10% strength gives you real brightening and antioxidant benefits with much less chance of tingling or irritation. Should I start with C10 or go straight to C20?If your skin is sensitive or you've never used vitamin C, start with C10. Once your skin is comfortable using it daily, you can graduate to our 20% C20 for a stronger dose. Will I still see results at 10%?Yes — because it's blended in small batches and fully active, a gentle 10% still brightens, supports collagen and helps target dark spots. It just works a little more gradually than 20%. 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. 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.
