The base cream that I bought is Water Sleeping mask base. I would like to inquire as follows.
1. Do I still need to add more preservatives to this base cream? Or the factory has already put
2. Apart from I have to add any active substances as needed, does this base cream contain any anti-irritating substances or do I have to put them myself?
3. In the list of Active substances that I will add, there will be a volume of 20% (including distilled water - preservatives and anti-irritants). I don't know if the base cream is acceptable or not. In fact, the amount of distilled water may be reduced further for dissolving the substance. Feel free to ask for advice.