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Dissolve the vitamin C powder in the distilled water and stir until the water becomes clear
Sprinkle the hyaluronic acid powder into the solution and cover with a lid, then shake vigorously
Cover and refrigerate the mixture for about an hour or until the hyaluronic acid has fully dissolved (overnight is fine too)
If adding optional ingredients like glycerin, oil, or preservative, do so after the primary mix is set and mix until well combined
Transfer the serum into a dark glass bottle with a dropper
Store in the fridge for a week or two and check for discoloration (yellow or brown indicates oxidation)
Apply the serum to damp skin and follow with a moisturizer like plant oil or moisturizing cream