Updated: Apr 16
You may find an inexpensive serum that contains say, retinol, but you’re likely paying for the quality and the source, the potency and the bioavailability. Think of it as the difference between an acrylic knit jumper and a cashmere one. It may have the same purpose, but if it’s a low-grade ingredient, or if the potency is minuscule, it won’t be doing much for you in the long run.
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