After testing the YOUN Beauty 20% Vitamin C Serum for two weeks, I'm impressed by its brightening effects and lightweight texture. Here's my honest take:

PROS:

• Visible radiance in days: Like several reviewers mentioned, I noticed a subtle glow within 3 days – my post-acne marks looked faded and skin tone appeared more even.

• Gentle on sensitive skin: As someone prone to redness, I appreciated the soothing blend of Centella Asiatica and aloe vera. No stinging or irritation (a rarity with vitamin C!).

• Perfect summer texture: The watery consistency absorbs instantly without sticky residue – ideal for layering under sunscreen in humid weather.

CONS:

• The mysterious scent: While not overpowering, there's a faint medicinal smell (likely from the ferulic acid) that might bother fragrance-free purists.

• Bottle design flaws: The dropper gets stubborn over time, and the opaque glass – while great for preventing oxidation – makes it hard to gauge how much product remains.

BEST USED WHEN:

• Applied to damp skin post-cleansing for enhanced absorption (my dermatologist-approved trick!)

• Paired with a rich moisturizer at night to combat potential dryness from the 20% vitamin C

WHO SHOULD SKIP:

• Those allergic to witch hazel (a minor but notable ingredient)

• Anyone expecting dramatic overnight results – this works gradually over 4+ weeks

THE VERDICT: 4/5 stars. While not perfect, it's one of the few vitamin C serums I've tried that delivers visible brightening without irritation. Worth the splurge if you prioritize clean ingredients and dermatologist formulations.