*BESTSELLER* Vitamin C Serum
FRESH DROP: Now shipping fresh batches bottled on Nov 17, 2025.
Because Vitamin C works best when it’s fresh.
Dermatologist-Tested for Sensitive Skin (Dermatest® Excellent Rating for Skin Tolerability)
Meet our Bestselling Collagen Booster, Vitamin C Serum!
- A lightweight but hydrating oil-free serum.
- Formulated with 20% L-ascorbic acid, the purest form of vitamin C, at pH level of below 3.5 for MAXIMUM PENETRATION, allowing vitamin C to work from WITHIN to visibly brighten the skin and even out skin tone
- Allantoin to carry active ingredients into the skin for MAXIMUM RESULTS
- Hyaluronic acid and panthenol (Vitamin B5) to hydrate the skin and replenish skin barrier for healthier skin.
Click here to find out why Dr. Louie developed Vitamin C Serum.
Certified for Your Peace of Mind:
- EWG Verified® for the highest standard of ingredient safety and transparency.
- Certified by The Vegan Society, ensuring our formula is cruelty-free and contains no animal-derived ingredients.
Before/After Pictures
- Visible improvement in the look of redness, reduced look of inflammation, and overall brighter skin
- Visibly reduced appearance of hyperpigment
SAMPLE WITH ORDER
- Two potent antioxidants for maximum benefits: Formulated not only with 20% of L-ascorbic acid at an optimal pH level of 3.2 but also with another strong brightening agent, Emblica Extracts, for enhanced brightening effects and protection against skin aging caused by free radicals
- Strengthens weakened skin barrier: Provitamin B5 (panthenol) and Aloe extract soothe irritated and sensitive skin while strengthening the skin barrier.
- Gives long-lasting hydration: Hyaluronic acid and plant-derived glycerin draw moisture and lock it in to keep the skin hydrated, keeping skin plump and health.
- Works in synergy with All-in-One Essence for enhanced antiaging effects: L-ascorbic acid in this product and AA2G, patented and stabilized form of L-ascorbic, in All-in-One Essence work in synergy to deliver enhanced antiaging and brightening benefits.
PUREST form of Naturally-Occuring Vitamin-C (L-Ascorbic Acid) 20%
Clinically-proven antioxidant that gets absorbed quickly into the skin to protect the skin from free radical damage
Hyaluronic Acid
Draws moisture from the surrounding to give the skin a long-lasting hydration
Panthenol
Regenerates the skin while strengthening the skin barrier
Emblica Extracts:The patented 200 x concentrated Indian Gooseberries, Emblica, high in pure Vitamin C. A strong antioxidant, age-defying, and brightening agent
AQUQ, ASCORBIC ACID, GLYCERIN, PANTHENOL, ALLANTOIN, HYALURONIC ACID, ARGININE, CAPRYLYL GLYCOL, PHYLLANTHUS EMBLICA FRUIT EXTRACT, ALOE BARBADENSIS LEAF JUICE
After washing your face, dab in 4-5 drops per cheek. Use before using Revitalizing All-in-One Essence.
For best results, keep the product at around 15℃.
*Because of the special nature of ascorbic acid, the product may change colour to brown after opening. As such, we recommend using the product within 3 months.
Our Recommendation
- For Collagen Boosting: Use with All-in-One Essence
- For Sensitive Skin: Use every other day (at night) to make sure your skin gets used to ascorbic acid
Choose options
Dedicated to Brilliance: In-Depth Vitamin C Serum Insights
Winter Snow and the Hidden Danger of UV Rays – Why You Need Vitamin C Serum Now
Did you know that Vitamin C Serum is more important in winter when snow is abound than summer? It's because of the "hidden dangers" of UV rays during winter. Click to find out more!
Read more
Everything You Wanted to Know about Vitamin C Serum
One of the most frequently asked questions about Vitamin C Serum is when the BEST time it is to use Vitamin C Serum. Is it morning or night? Let's find out.
Read more
When is the Best Time to Use Vitamin C Serum: Morning or Night?
One of the most frequently asked questions about Vitamin C Serum is when the BEST time it is to use Vitamin C Serum. Is it morning or night? Let's find out.
Read moreFrequently Asked Questions
Absolutely! We use a high concentration of panthenol to soothe sensitive skin.
You can apply it first at night time, every other day to make sure your skin gets used to Vitamin C. Then you can slowly increase frequency.
You can use it both morning and night.
Just make sure to cover it with SPF, like our Protection Cream, when you use it in the morning.
We generally recommend 4-5 drops per cheek, but it all depends on how much moisture you need. Just DAB it in, instead of rubbing it in.
Yes, you can use our Vitamin C serum if you're pregnant or nursing. However, skin can become more sensitive during this time, so we recommend doing a patch test before full use to ensure compatibility. As always, consult with your healthcare provider for personalized advice.
Yes, our Vitamin C Serum is gluten-free.
We recommend using our Vitamin C Serum morning AND night. Always use sun protection in the morning as ascorbic acid (vitamin C) boosts sun protection.
You can use it as the first step of your skincare routine OR mix together with our All-in-One Essence.
We recommend using our Vitamin C Serum with All-in-One Essence for glass-like radiance.
You can use Vitamin C Serum both morning and night. Dark Spot Serum is for night time. Your routine would generally be like this:
Morning
1) On clean face, apply Vitamin C Serum all over, followed by our All-in-One Essence or a moisturizer of your choice.
Night
1) On clean face, apply Dark Spot Serum on areas where you have dark spots, age spots, and visible wrinkles.
2) Apply Vitamin C Serum all over, followed by our All-in-One Essence or a moisturizer of your choice.
If you have SENSITIVE skin, then use Vitamin C Serum in the morning, and Dark Spot Serum at night.
Vitamin C Serum should be clear to yellow. But if it turns bright orange to brown, stop using it as it has oxidized and lost its effectiveness.
As a general rule of thumb, try to finish using Vitamin C Serum within 3 months of opening. When not opened, please keep it in the refrigerator until you open it for use.
All Things Vitamin C
Learn more about our research and expert tips on Vitamin C, in particular L-ascorbic acid.
Winter Snow and the Hidden Danger of UV Rays – Why You Need Vitamin C Serum Now
Did you know that Vitamin C Serum is more important in winter when snow is abound than summer? It's because of the "hidden dangers" of UV rays during winter. Click to find out more!
Read moreEverything You Wanted to Know about Vitamin C Serum
One of the most frequently asked questions about Vitamin C Serum is when the BEST time it is to use Vitamin C Serum. Is it morning or night? Let's find out.
Read moreWhen is the Best Time to Use Vitamin C Serum: Morning or Night?
One of the most frequently asked questions about Vitamin C Serum is when the BEST time it is to use Vitamin C Serum. Is it morning or night? Let's find out.
Read more