When and How to Use Vitamin C Serum? A Guide by Rysun’s Experts

Confused about when and how to apply Vitamin C serum? Rysun Biotechnology’s R&D team explains the optimal routine: morning application for protection, correct layering order, and how to maximize results with scientific precision.

When and How to Use Vitamin C Serum? A Guide by Rysun’s Experts

At Guangzhou Rysun Biotechnology Co., Ltd., we believe that even the most advanced formula—backed by our 253 intellectual properties—can only deliver peak results if applied correctly. Vitamin C is a potent bioactive ingredient, and its efficacy is heavily improved by timing and technique.

Our research team, drawing from over a decade of formulation experience, has developed the definitive protocol for using Vitamin C serum.

When to Use: The Morning vs. Night Debate

While Vitamin C can be used at night, our R&D experts overwhelmingly recommend Morning Application (AM).

Why? Vitamin C’s primary strength is its ability to neutralize free radicals caused by UV rays and pollution. By applying it in the morning, you are essentially loading your skin with an antioxidant reservoir that remains active throughout the day.

• The Science: When layered under sunscreen, Vitamin C has been shown to boost the photoprotective power of the SPF, preventing oxidative damage that sunscreen alone might miss.

How to Use: The 4-Step Rysun Protocol

To ensure deep penetration and stability, follow this order of operations:

Step 1: The "Clean Canvas" Prep

Vitamin C (especially L-Ascorbic Acid) penetrates best at a low pH.

• Action: Cleanse your skin thoroughly.
• Expert Tip: If you use a toner, ensure it is a hydrating, water-based toner. Avoid heavy, oily toners before Vitamin C, as they can create a barrier that blocks absorption.

Step 2: Application Technique

• Dosage: Dispense 3–5 drops. You do not need more; high-quality serums are concentrated.

• Method: Gently press the serum into your skin using your palms. Avoid aggressive rubbing, which can cause unnecessary friction. Focus on the face, neck, and décolletage.

Step 3: The "Golden Minute"

• Action: Wait 60 seconds before the next step.
• Why: This brief pause allows the serum to fully absorb and the pH of your skin to normalize slightly before you apply other products.

Step 4: Lock and Protect

• Layering: If you use other serums (like Hyaluronic Acid), apply them after the Vitamin C.
• The Seal: Apply your moisturizer to lock in hydration.
• The Shield: Finish with a Broad-Spectrum Sunscreen (SPF 30+). This is non-negotiable. Vitamin C prevents damage, but it leaves fresh skin cells vulnerable if not shielded from direct sun.

Crucial Interactions: What to Avoid

Even a stable formula can be rendered ineffective if mixed with the wrong ingredients.

The Rysun Stability Standard

Many consumers ask, "How do I know if my serum is working?" The answer lies in stability. Vitamin C is notorious for oxidizing (turning brown) when exposed to air. Rysun leverages advanced packaging technology and stabilizing agents to prolong shelf life. However, you can help by:

• Storing the bottle in a cool, dark place (away from bathroom humidity).

• Closing the lid tightly immediately after use.

FAQs

1. Can I use Vitamin C serum every day?
Yes. In fact, consistency is key. Our data shows that daily application builds up the skin's antioxidant reservoir for maximum protection.

2. What color should my serum be?
A fresh Vitamin C serum should be clear to light straw-colored. If it turns dark orange, it might be oxidized.

3. Can I use it if I have acne?
Yes. But better choose a serum specific to treat acne.

4. Why does it tingle when I apply it?
A slight tingle is normal for L-Ascorbic Acid due to its low pH. However, if it burns or turns the skin red for prolonged periods, switch to a gentler derivative like Sodium Ascorbyl Phosphate.