trial and eror

What do you mean?

These are the things I would recommend: 1. Always start slow when introducing a new product into your routine to allow your skin to adjust to it. 2. Always patch test to make sure you do not react to the product by testing it on your jaw line. 3. If you're not sure which product to use first, always use in order from thinnest to thickest. 4. Only introduce one new product into your routine at a time. This will help you to determine which is the criplet if you get a reaction. If you follow these general guidelines, you'll know which products will work well with your skin and which doesn't. Always listen to your skin.

This is what you have to do to find out which ingredients are suitable for your skin

make sure to patch test and read and research on the ingredients!💖💖💖