Ideal for these concerns: blemishes, pigmentation, melasma, aging.
Week 1-2: every other morning
Week 3-4: every morning daily
after another week bump up to using the serum twice per day.
Some sensitive skin types may only be able to use this serum once per day and buffer the acid by applying it mixed with your daily moisturizer.
Step in home routine: after cleansing, toning before moisturizer and/or SPF.