Storage and Temperature Stability of Cosmetic Products and Ingredients

Question

I have questions regarding the storage of cosmetic products and ingredients, specifically concerning the impact of temperature changes.

If I make a 50g product (estimated to last 1-3 months depending on frequency of use) and store it in the refrigerator, then take it out to apply at room temperature for no more than 3 minutes before returning it to the refrigerator daily (morning and evening), should I be concerned about the frequent temperature changes affecting ingredient degradation? If so, I might store the finished product at room temperature in a dark place instead.
Similarly, for cosmetic ingredients, I take them out of the refrigerator and leave them at room temperature for approximately 2-5 hours for mixing. After mixing and obtaining the product, I return the ingredients to the refrigerator. I do this process for several items, so it takes multiple days (around 3-5 days) of taking ingredients out and putting them back. After finishing the batch, I store the product (and unused ingredients) in the refrigerator for about 2-3 weeks. When I need to make a new batch, I repeat the same process of taking ingredients out for 3-5 days. Does this repeated temperature change affect the ingredients?

MySkinRecipes Expert · Accepted Answer

Storage for Products with Lemon Peel Bioferment (Lemon Skin™)

Regarding the storage of products containing Lemon Peel Bioferment (Lemon Skin™):

Short-Term Use (within 1 month): Refrigeration is not strictly necessary. Storing the product away from direct sunlight and high heat is sufficient to maintain quality.
Long-Term Storage: Keeping the product in a cool place, such as a refrigerator, helps to extend its shelf life and preserve the effectiveness of heat-sensitive ingredients.

Impact of Temperature Changes:

Taking the product out of the refrigerator for brief periods (a few minutes) for application and returning it is generally fine.
Frequent and significant temperature fluctuations, like leaving the product or ingredients at room temperature for several hours repeatedly, can speed up the degradation of sensitive components. Avoid drastic changes like repeated freezing and thawing.