My Guide to the Best Vitamin C Serums What They Do and Which Ones Are Worth It

Let’s talk about vitamin C serum not the kind you take as a supplement, but the kind that goes directly on your face. A vitamin C has become one of the most important products in my skincare routine, and honestly? I wish I had started using it sooner.

Over the past year, I’ve tried several vitamin C serums some stronger, some more gentle and I’ve learned what actually works for my skin. In this guide, I’ll break down what a good serum does, how to use it, and which ones are really worth your time (and money).

Why Vitamin C Belongs in Your Routine

A vitamin C can help with:

• Brightening dull skin
• Fading dark spots and acne marks
• Evening out skin tone
• Protecting against pollution and sun damage (when used with SPF)
• Supporting collagen production for firmer-looking skin

It’s like giving your skin a healthy morning smoothie  packed with antioxidants that make everything look fresher and more alive.

Now let’s get into the products. These are some of the best vitamin C serums I’ve used, and here’s exactly what I think about each one.

COSRX The Vitamin C 23 Serum (20ml)

This serum is a powerhouse. With 23% pure ascorbic acid, it delivers one of the highest concentrations of vitamin C on the market  and you can feel it. The texture is watery but slightly oily, and it absorbs quickly into the skin. You’ll probably feel a light tingling sensation on the first few uses, especially if your skin isn’t used to high-strength actives.

What I love:

• It gives a visible glow within a few days
• Helps fade post acne scars and pigmentation
• Contains vitamin E and hyaluronic acid for added hydration

Tips: Keep it in the fridge to slow down oxidation, and always follow with sunscreen. This one is great for experienced users or anyone who wants fast, visible results.

innisfree Green Tea Enzyme Vitamin C Brightening Serum (30ml)

This is the one I reach for when my skin feels tired, dull, or slightly sensitive. It’s made with Jeju green tea enzymes that help gently exfoliate the skin while delivering a stable form of vitamin C. The formula is lightweight, almost gel like, and layers well under makeup.

What I love:

• Gentle enough for everyday use
• Smells fresh and natural
• Works well for people new to vitamin C

It doesn’t sting, it doesn’t pill, and it gives my skin a soft glow after about a week of use. I’d call this the best all rounder.

SOME BY MI Galactomyces Pure Vitamin C Glow Serum (30ml)

If you’re into K-beauty, you’ve probably heard of galactomyces  a fermented ingredient that helps with texture, tone, and elasticity. This serum combines it with vitamin C for a two-in-one punch: it brightens while also refining your pores and smoothing the skin.

What I love:

• Brightens and smooths at the same time
• Helps with uneven skin tone and dullness
• Doesn’t oxidize quickly like other serums

The texture is slightly thicker, and it feels like a treatment. It’s perfect for skin that looks uneven or congested.

I’m From Vitamin Fruit Serum (30ml)

This one stands out because it’s not just about vitamin C  it’s about feeding your skin a full mix of natural antioxidants. Made with 74% vitamin rich fruit extracts, especially sea buckthorn, this serum feels nourishing and soothing. The texture is slightly oily but absorbs beautifully.

What I love:

• Natural and plant-based formula
• Adds glow without irritation
• Great for dry or stressed skin

This is the serum I use when I want results and comfort. It’s not as strong as the COSRX one, but it’s reliable and kind to my skin.

How to Use a Vitamin C Serum (Without Wasting It)

1. Use it in the morning after cleansing and before moisturizer.
2. Apply to clean, dry skin  2 3 drops are enough.
3. Follow with SPF  vitamin C + sunscreen = the ultimate protection team.
4. Start slowly  2 3 times a week, then build up to daily use.

Final Thoughts

A good serum isn’t just a trend it’s one of the best ways to keep your skin looking bright, even, and protected. Whether you’re looking for fast results (hello COSRX), something soothing (like I’m From), or a gentle daily booster (innisfree), there’s a formula that can work for your skin.

I always say this: consistency matters more than price. Find a serum that works for your skin type, use it regularly, and you’ll start to see that natural glow.

For more info you can DM us on our Instagram