I ordered the gold serum for the Ziip Machine. I also order two regular serums to boost the longevity of my gold serum purchase - I first use the regular serum, then top it off with the gold to extend its use. I can definitely feel a difference in how the serum glides with the Ziip when I add the gold serum. I know it's chock full of good ingredients and I can definitely feel the difference when I'm using it.
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