Tag: Serum stability

Studies have shown that active ingredients like vitamin C can degrade significantly when exposed to UV light. So, while the common myth is that vitamin C has to be in a glass bottle, the critical factors for preserving its potency are actually opacity and an airtight seal, regardless of the container material.

A fresh vitamin C serum should be clear or a pale yellow, but many change color over time due to oxidation. Knowing how to know if vitamin C is stable is crucial for ensuring you get the full antioxidant benefits for your skin, protecting it from free radical damage and promoting a brighter, more even tone.