The other day I bought la sirene (intensive night emulsion, recommended by woman in shop), but because the la sirene day moisturiser is "whitening" I didn't buy it, instead I bought Neutrogena SPF 15 for day use. Does it matter if you mix different moisturisers from different companies?
No, it doesn't matter, although the staff at beauty counters will tell you that it will, because they obviously want you to buy only their particular products.