Q: Should I replace my products all at once? Or integrate them slowly? Also, do I need to use the same brand for my entire skincare routine?
A: It depends on your skin and your skin care goals.
When our skin changes radically due to environment or hormones, more than one new product may be necessary and it is okay to incorporate more than one product into your new routine.
If you are adding a new product for increased anti-aging benefit, changing only one product at a time can give you a better idea of the results you are getting (or if your skin is reacting badly).
You do not need to use the same brand of skin care products for your entire routine and the only person that will tell you otherwise is an eager salesperson!