# How Long Does Vitamin C Serum Last?

**By Abdul Ahad** · 2025-08-18

📅 Last updated: May 2026

## **How Long Does [Vitamin C](/blogs/ingredients/vitamin-c-for-your-skin-the-benefits-of-this-powerful-antioxidant) Serum Last?**

Vitamin C is well-known for its ability to brighten skin, reduce hyperpigmentation, stimulate collagen production, and protect skin from environmental damage. Like many active ingredients, Vitamin C has a shelf life and its potency can degrade over time. For acne-prone skin, always choose **non-comedogenic**, dermatologist-tested formulas that won't clog pores.

### **How Long Does Vitamin C Serum Last?**

Vitamin C serum can last anywhere from 3 to 6 months after opening, depending on formulation, concentration, and storage conditions.

#### **1\. Concentration of Vitamin C**

Higher concentrations (20% and above) are more likely to degrade faster due to oxidation when exposed to air, light, and heat.

#### **2\. Packaging**

Opaque or dark-colored bottles protect serum from UV light. Air-tight packaging prevents oxygen exposure, preserving potency.

#### **3\. Storage Conditions**

Temperature and light exposure influence shelf life. Heat and light cause faster degradation. Store in cool, dark place.

### **How to Tell if Vitamin C Serum Has Expired**

#### **1\. Change in Color**

Fresh Vitamin C serum is light to medium amber. Drastic darkening to yellow or brown indicates loss of effectiveness.

#### **2\. Strong Unpleasant Odor**

Sour or pungent smell indicates Vitamin C has oxidized and is no longer effective.

#### **3\. Separation or Texture Change**

Separation, graininess, or unusual thickness are signs the serum is losing potency.

### **How to Store Vitamin C Serum**

#### **1\. Keep in Cool, Dark Place**

Away from direct sunlight. A bathroom cabinet or drawer away from the sink is ideal.

#### **2\. Seal Bottle Tightly**

Minimize exposure to air after each use. Oxygen causes Vitamin C to break down faster.

#### **3\. Refrigerate (Optional)**

Refrigeration can slow oxidation process, especially for higher-concentration serums.

#### **4\. Avoid Temperature Fluctuations**

Avoid areas with extreme temperature changes like near windows or radiators.

### **How Long Does [Millionaire Glow Serum](https://www.amazon.com/dp/B0CLKLK662) Last?**

Dr. Crazy Beauty's Millionaire Glow Serum has shelf life of up to 6 months after opening when stored correctly. Dark, air-tight bottle protects Vitamin C from light and oxygen.

### **FAQs**

Vitamin C serum lasts 3-6 months after opening. Store in cool, dark place. Darkening color, unpleasant odor, or texture changes indicate expiration. Refrigeration helps extend shelf life.

### **Conclusion**

Proper storage is key to ensuring Vitamin C serum remains effective. Millionaire Glow Serum by Dr. Crazy Beauty offers stable, effective Vitamin C formula that lasts up to 6 months when stored properly.

**Tags:** anti-aging serum, dr crazy beauty, glow serum, skincare tips, vitamin c serum

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> Source: [Dr. Crazy](https://www.drcrazybeauty.com/en-au/blogs/learninglab/how-long-does-vitamin-c-serum-last)