Three bottles for the price of two. Our 20% L-ascorbic acid paired with niacinamide (vitamin B3) — a duo aimed squarely at the look of dark spots, discoloration and uneven tone. Stock up, keep the extras refrigerated, and never run out of fresh vitamin C. Why fresh matters Brightening is a patience game — and it only works if the vitamin C is actually active. Because L-ascorbic acid oxidizes on the shelf, a months-old serum brings less to the job. We blend in small batches and hand-date every bottle so both brightening actives are at full strength when you start. What it does Targets dark spots. Helps interrupt excess pigment so sun spots, marks and discoloration gradually look less noticeable, for a more even-looking tone. Boosts radiance. Vitamin C brightens overall dullness for skin that looks clearer, fresher and more lit-from-within. Calms & strengthens. Niacinamide helps soothe redness and support the skin barrier while the vitamin C does its brightening work. Key ingredients L-Ascorbic Acid — Active vitamin C — brightens, supports collagen and helps soften the look of discoloration over time. Niacinamide (Vitamin B3) — A gentle brightener that helps limit pigment transfer, calm redness and strengthen the skin barrier. Glycerin — A humectant that keeps the formula hydrating and comfortable for daily use. Full ingredients: Purified Water, 20% L-Ascorbic Acid, Niacinamide (Vitamin B3), Citric Acid, Magnesium Sulfate, Glycerin. How to use Cleanse skin. Apply 5–6 drops. Pat gently over the face, focusing on areas of discoloration. A mild tingle is normal. 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 Will all three bottles stay fresh?Yes. Each bottle is blended in small batches and hand-dated, and unopened bottles keep their potency for months in the refrigerator. Open one at a time and use it within about three months of opening. How is this different from the other C20 serums?All three use 20% L-ascorbic acid. This one adds niacinamide specifically to target dark spots, discoloration and uneven tone, and to help calm redness — so it's the pick if pigmentation is your main concern. Can I use vitamin C and niacinamide together?Yes. Despite an old myth, modern formulas pair them safely, and together they're a strong duo for brightening and evening skin tone. This serum combines both for you in one step. How long until dark spots look less noticeable?Change is gradual. Many people see brighter, calmer skin within a couple of weeks, with more even-looking tone over 6–8 weeks of daily use. Wearing sunscreen every morning is what keeps new spots from forming. 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.