Pour the 1 Tablespoon plus 2 teaspoons cold water or hydrosol into the small bowl and then sprinkle the hyaluronic acid powder evenly over the surface.
Mix until combined, about 1-2 minutes.
Add the rest of the ingredients and stir or whisk to combine.
Pour the serum into a 1 ounce jar.
Notes
Storage and Shelf Life: Keep in a cool, dark place away from direct light and heat. With the preservative, this should last for several months. Without the preservative, it will last 1-2 weeks in the fridge. To use: Apply 1-2 times daily to damp skin after cleansing and before moisturizing. Shake well before use.