Hi Lise, Some extracts, preservatives and oils are extremely weakened and sensitive by light and extreme changes in temperature. My son-in-law insists on keeping his lotions for his rough dry hands in his truck, year round, and wonders why they go bad so fast. Not only do they smell sour, but also rancid. As a manufacturer, I add vegetable glycerin in the winter months when I have to ship, and I also have to change the barcodes here in the US, just because I changed the formulae a little so it would not freeze during shipping process. Lesson here, skin care product do destabilize for a ton of reasons, light, heat, and freezing cold, and much more.
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My son-in-law insists on keeping his lotions for his rough dry hands in his truck, year round, and wonders why they go bad so fast. Not only do they smell sour, but also rancid.
As a manufacturer, I add vegetable glycerin in the winter months when I have to ship, and I also have to change the barcodes here in the US, just because I changed the formulae a little so it would not freeze during shipping process. Lesson here, skin care product do destabilize for a ton of reasons, light, heat, and freezing cold, and much more.