Potential duplication of Tracie Martyn Firming Serum™ – part four

Welcome to part four of this potential duplication of Tracie Martyn Firming Serum. To catch up, check out part one, part two, and part three. When creating a potential formula, I always have to consider how much of each ingredient to use. But first, I need to figure out where the 1% or lower line…

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