I prefer using the 5% lactic acid for my skin type. The 10% stung sometimes and i had to be very careful when using it on my sensitive skin. The 5% has never caused me issues

The ordinary lactic acid 5% is one of my holy grails for removing dead skin buuldup on my forehead. I have dry and sensitive skin, and my skin can get quite dehydrated when i don’t handle dead skin buildup, as products can’t penetrate well. 
I decided to pick up the 10% to see how my skin reacted. It is still bery effective and I enjoyed using it... but i prefer the 5%, as it works for me just as well and causes no sensitivity 🥰

The Ordinary - faffyskin review for Lactic Acid 10% + HA

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