VITAMIN C SERUM COLOR CHANGE

Hi there, thanks for clicking this.
A Vitamin c serum I formulate chages colour from clear to dark yellow within 2 months.

Formula 
Aqua 92.5%
3% Ascorbic Acid
1% Niacinamide
1% Germall plus preservative 
2% Glycerin
0.5 xanthan gum. 

Any help please 🙏 

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