A $95 serum that lasts six months can easily beat a $24 dupe you go through in five weeks. Shelf price tells you almost nothing about real cost — cost per use does.
Product A
Product B
Assumption. This estimate assumes the full product size is usable and does not account for expiration before finishing the container — a real factor for some actives and natural formulations.
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Evidence-aware skincare picks and honest dupe comparisons, every day.