How to Use Vitamin C Serum: Expert Tips for Radiant, Glowing Skin

There's a reason dermatologists and beauty editors alike rave about vitamin C. When applied topically, this powerful antioxidant delivers a host of vitamin C benefits for your skin:

Vitamin C helps inhibit melanin production, which means it works wonders on dark spots and dull patches. It leaves your complexion looking visibly brighter and more even-toned.

From sun spots to post-acne scars, vitamin C targets hyperpigmentation and helps fade it over time. It's your go-to if you're dealing with uneven tone.

Vitamin C plays a key role in collagen synthesis, helping to firm up your skin and smooth fine lines. Talk about anti-ageing goals!

Thanks to its antioxidant properties, it shields your skin from the damage caused by UV rays, pollution, and other stressors. One of our go-to picks? The Lakmē 9 to 5 Vitamin C + Serum infused with Kakadu Plum (one of the richest natural sources of vitamin C), this lightweight serum helps reduce dullness and gives your skin that fresh, radiant glow. Another star is Dermalogica Biolumin-C Serum brightening vitamin C serum that strengthens the skin's defences while delivering an intense glow.

While vitamin C is undeniably powerful, it needs to be applied the right way to maximise its benefits. Here's your complete breakdown of how to use vitamin C serum effectively:

Start with a gentle cleanser like the Simple Protect N Glow Vitamin C Glow Facial Wash to remove impurities and get a clean slate.

Once your skin is clean :

1. Use 2–3 drops of Vitamin C serum on your palm or face.
2. Gently dab or massage in circular motions.
3. Let it absorb fully before layering other products.

No need to drench your skin—how much to use? About 2–3 drops are enough to cover your face and neck. Gently press it into your skin; don't rub harshly.

Seal in all that glow with a good moisturiser such as the Simple Hydrating Light Moisturiser. You can go for a product that layers well with actives, like a simple hydrating cream or one that complements the serum's benefits.

Vitamin C is most effective when used in the morning and followed up with sunscreen to protect your skin from UV rays. It's a glow + protection combo that's hard to beat.

Some people may experience irritation or sensitivity when using vitamin C serum. If you have sensitive skin, start with a lower concentration (5–10%) and use it every other day. Choose formulas with calming ingredients like hyaluronic acid or vitamin E, and always do a patch test before full use.

To prevent irritation and ensure your vitamin C serum works effectively, here's what not to use with vitamin C in the same routine:

• Retinol (Vitamin A): May cause irritation when layered. Use vitamin C in the morning, retinol at night.
• AHAs/BHAs (e.g., Glycolic, Lactic, Salicylic Acid): Risk of over-exfoliation—alternate usage.
• Benzoyl Peroxide: Can deactivate vitamin C. Use vitamin C in the morning, benzoyl peroxide at night.
• Niacinamide: Generally safe, but may cause flushing in sensitive skin. Use separately if needed.
• Copper Peptides: Can destabilize vitamin C. Best used in different routines.

Not all vitamin C serums are created equal. Some pack extra punch by combining vitamin C with other glow-boosting ingredients:

• 10% is ideal for beginners or sensitive skin—gentle yet effective for daily use.
• 15–20% suits more experienced users seeking stronger results, especially for dullness or pigmentation.

• L-Ascorbic Acid is the most potent and research-backed form, but it can be irritating for some.
• Derivatives like Sodium Ascorbyl Phosphate or Magnesium Ascorbyl Phosphate are gentler and more stable, great for sensitive skin.

• Look for serums indark or airless packaging to protect against oxidation.
• Fragrance-free, alcohol-free options are best for minimizing irritation.
• Serums with complementary ingredients like Vitamin E, Ferulic Acid, or Hyaluronic Acid boost both stability and effectiveness.

Before you start slathering on that serum, take note of these important vitamin C commandments: DO:

• Store your serum in a cool, dark place to prevent oxidation and maintain potency.
• Use it once a day in the morning for optimal protection against environmental damage.
• Layer it with hydrating ingredients like hyaluronic acid or niacinamide to soothe and support your skin barrier.
• Do a patch test before full application to check for irritation or allergic reaction, especially if you have sensitive skin.
• Consider a vitamin C-infused moisturiser if your skin is sensitive to serums—it's a gentler way to reap the benefits.

DON'T:

• Mix with AHAs, BHAs, or retinolunless your skin is already accustomed to those combinations.
• Use expired or discoloured serum - oxidised vitamin C turns dark yellow or brown and loses its effectiveness.
• Skip SPF- vitamin C enhances sun protection, but without sunscreen, your skin is more vulnerable to UV damage.
• Overuse it- more product doesn't mean better results; stick to the recommended 2–3 drops.
• Apply to broken or irritated skin as it may cause stinging or worsen sensitivity.

We get it—you want results yesterday. But when it comes to skincare, consistency is key. With regular use, most people begin to see brighter, more even-toned skin within 2–4 weeks. Stubborn pigmentation may take 8–12 weeks to visibly fade. Stick with it, and don't forget to pair your serum with a full routine—cleansing, moisturising and SPF included. The Lakmē 9 to 5 Vitamin C + Serum and Dermalogica Biolumin-C Serum brightening vitamin C serum both work beautifully with other glow-getting essentials to deliver long-term results.

Yes! Most vitamin C serums are safe for daily use. If you're new to actives, start with every other day and gradually increase frequency.

It's best used in the morning to protect your skin from daytime environmental damage, but it can be used at night too—just don't skip your SPF the next day.

Yes, but proceed with caution. Vitamin C pairs well with hyaluronic acid and niacinamide. Avoid layering directly with strong acids or retinol unless advised by a derm.

That's a sign of oxidation. Once your serum turns brown or dark orange, it's lost potency and should be replaced.

Absolutely. Vitamin C helps reduce inflammation and fade post-acne marks. Look for lightweight, non-comedogenic formulas to keep breakouts at bay.