While vitamin C serum is generally non-comedogenic and shouldn't cause breakouts, some people may experience initial purging or reactions. Here's what you need to know:

• Purging vs. Breaking Out: Initial breakouts (1-2 weeks) might be purging as skin cell turnover increases
• Formula Matters: Oil-based serums may clog pores in acne-prone skin - choose water-based formulas
• Concentration: Start with lower concentrations (10-15%) to minimize reactions

Morning application is ideal for vitamin C serum, but it can be used at night too. Here's the complete guide:

• Morning Benefits: Provides antioxidant protection against UV damage and pollution throughout the day
• Night Benefits: Works on repair and brightening while you sleep without sun exposure concerns
• Best Practice: Apply in the morning after cleansing, before moisturizer and SPF

Yes, vitamin C serum does expire and can lose effectiveness over time. Here's what to watch for:

• Typical Shelf Life: 3-6 months after opening, 1-2 years unopened
• Signs of Expiration: Yellow/brown color change, unusual smell, or separation
• Storage Tips: Keep in a cool, dark place; refrigeration can extend life

The correct order for vitamin C serum in your routine:

1. Cleanser - Start with clean skin
2. Toner (optional) - Balance pH
3. Vitamin C Serum - Apply to face and neck
4. Hyaluronic Acid (if using) - For hydration
5. Moisturizer - Lock in the serum
6. Sunscreen (AM only) - Essential protection

Wait 1-2 minutes between each step for better absorption.

Apply vitamin C serum to these areas for best results:

• Face: Entire face, avoiding the eye area
• Neck: Don't forget this often-neglected area
• Chest/Décolletage: For anti-aging benefits
• Back of Hands: To reduce age spots

Avoid: Direct application on eyelids, broken skin, or active acne lesions.

Less is more with vitamin C serum! Here's the right amount:

• Face: 2-3 drops (about a pea-sized amount)
• Neck: 1-2 additional drops
• Frequency: Once daily to start, can increase to twice daily

The best vitamin C serum uses Sodium Ascorbyl Phosphate, a stable and gentle form of vitamin C:

• Superior Stability: Resists degradation from air, light, and heat
• Gentle on All Skin Types: Much gentler than L-Ascorbic Acid
• Consistent Results: Reliable vitamin C activity from first to last drop

That's why we use Sodium Ascorbyl Phosphate in our Vitamin C+ Serum - for consistent, gentle, and effective results.

Vitamin C serum is beneficial for most people, especially those with:

• Dull Skin: Brightens and evens skin tone
• Dark Spots: Helps fade hyperpigmentation
• Fine Lines: Boosts collagen production
• Sun Damage: Provides antioxidant protection
• Ages 20+: Prevention and treatment of aging signs

Who should be cautious: Those with very sensitive skin, rosacea, or active eczema should start with gentler forms or lower concentrations.

Yes, vitamin C serum can sometimes cause dryness, especially with high concentrations. Here's how to prevent it:

• Start Low: Begin with 10% concentration
• Hydrate: Follow with hyaluronic acid and moisturizer
• Frequency: Use every other day initially
• Choose Wisely: Look for formulas with hydrating ingredients

Vitamin C can cause irritation in some cases. Signs and solutions:

• Signs: Redness, stinging, burning, or peeling
• Causes: High concentration, low pH, or sensitive skin
• Solution: Reduce frequency, lower concentration, or buffer with moisturizer
• Prevention: Patch test before full application

A mild tingling is normal, but burning is not. If you experience burning:

• Immediately: Rinse with cool water
• Check: Ensure product hasn't oxidized (turned yellow/brown)
• Adjust: Switch to a lower concentration or gentler form
• Avoid: Using on broken or compromised skin

Proper storage is crucial for maintaining vitamin C serum effectiveness:

• Best Location: Cool, dark place away from sunlight
• Temperature: Room temperature or refrigerated
• Avoid: Bathroom (humidity), windowsills, hot areas
• Container: Keep tightly sealed after each use

Vitamin C serum expiration timeline:

• Unopened: 1-2 years from manufacture date
• Opened: 3-6 months (L-ascorbic acid), 6-12 months (stable derivatives)
• Signs of Expiration: Color change, unusual smell, separation
• After Expiration: Less effective, may cause irritation

Yes, but with careful timing to avoid irritation:

• Best Practice: Vitamin C in the morning, retinol at night
• Why Separate: Different pH requirements and potential irritation
• Alternative: Use on alternating nights
• Advanced Users: Can layer with 30-minute wait time

Yes, vitamin C serum can be used at night with these considerations:

• Benefits: Overnight repair and brightening
• No Sun Concern: No immediate UV exposure
• Combinations: Avoid mixing with retinol or acids
• Best For: Those with sensitive skin who can't tolerate daytime use