Heard toner pad is the best way to prep your skin for makeup! Is there any recommendation?

I love this toner pad because it hydrates for makeup so well!! And wiping with the toner pad helps so much with smoothing out skin texture!

If you don't have sensitive skin, then you can use PHA daily as it's a very gentle exfoliant. And yes, you can use it with niacinamide, they're not conflicting and can be used together

You can try this for prepping your skin for makeup

You can use niacinamide with PHA together in the same routine but it’s best to wait 30mins in between applying products. By doing this you will not only give ingredients time to penetrate the skin, but it will also keep the pH levels of the formulas balanced and avoid potential irritation and redness on the skin. Another way is to use niacinamide in your morning routine and then use PHA in the evening. PHA’s have a larger molecular size than other AHA’s (glycolic acid) so they don’t actually penetrate as deeply into the skin but rather work on the outer layers of the skin. They are gentler but you should start out using these pads 1-2 times a week and then no more than 3-4 times after your skin adjust as long as there’s no irritation.

I wouldn't use exfoliants every day because they can damage your skin barrier. :( I hope this toner pads works for you!