Thinnest FirstpH SequencingNo Retinol + AHA Same NightSPF Always Last
Applying Vitamin C over a niacinamide serum, or retinol over a fresh AHA, reduces efficacy and increases irritation risk. For South Indian skin -- where barrier integrity is already under humidity stress -- getting the sequence wrong triggers PIH.
Thinnest
Apply First -- Serums Before Creams
pH
AHAs Need Low pH -- Apply Before Niacinamide
SPF
Always Final Step, Morning Only
Morning: cleanser, niacinamide, SPF. Evening: oil cleanser, foam cleanser, Vitamin C, tranexamic acid or retinol, ceramide moisturiser. Bakuchiol layers with almost anything. Retinol and AHAs should not share the same application night.
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