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This is an honest limitation of the current evidence base
I build it into serums at clinically supported percentages, and I often pair it with hydrators (hyaluronic acid) and barrier supporters (niacinamide, ceramides) to balance activity with comfort
Mass spectrometry, HPLC analysis, and certain enzyme assays can show unexpected peaks or signal interference from benzyl alcohol
They serve as messengers and system regulators in many roles
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