You may notice that your serum goes from pale or milky yellow to deeper orange or that overtime, there are shifts in smell common for high concentrations of Vitamin C. We’ve intentionally packed our Sunrise Glow Serum with 15% Vitamin C, a safe but infrequent level of this potent and wildly effective ingredient. To avoid such shifts, we suggest storing our Sunrise Glow Serum in a refrigerator or other dry, cool, dark place.