100 is great to start with! Definitely try a sample first if they still have those with orders since I can definitely feel the prickliness. I have normal/dry skin and generally can’t do any chemical or physical exfoliation without irritation; this hasn’t irritated at all and has definitely helped to even out my skin texture. I use most nights unless my skin seems irritated and have a very simple routine- thorough cleansing, galactomycies treatment, reedle serum (spreading motion not circular), a soothing serum, and a barrier cream. As always don’t forget sun protection during the day. So glad this product exists!