From what I hear, keeping your vitamin C serum in a cold, dark environment like a refrigerator is a good idea to keep it fresh and potent longer.
Would you agree with this idea?
Why do I ask? It gets a crusty residue inside the bottle.
Here is what i have noticed: I have been keeping mine in a small dropper bottle in the fridge. When I do this, I notice that the glass on the interior of the bottle gets a patchy, crusty residue which I assume is at least part L-Ascorbic acid and tocopherol. Also, when I unscrew the dropper and lift it out of the bottle, the glass tube connected to the rubber dropper is also encrusted with some of the same residue. Is putting it in the refrigerator messing up my serum? Is it separating my ingredients?
Also, if I were to keep taking it in and out of the fridge, do you think this daily temperature fluctuation, from cold to room temperature and then back to cold again, could hurt the actives in my serum? I only have it out of the fridge for maximum 30 minutes.
Here is the vitamin C serum formula:
- Distilled water- 72%
- L-Ascorbic acid- 15%
- Sodium lactate- 2%
- Ferulic acid- 0.5%
-Propylene glycol- 7%
- Tocopherol- 1%
- Polysorbate 80- 1%
- Optiphen- 1%
- Xanthan Gum- 0.5% (I just tried this in my newest batch, which I haven't refrigerated yet)
Should I keep it in my dresser from now, instead of the refrigerator?
Also, any critiques of this formula I am happy to hear.