Zero (tare) your scale with the empty measuring cup on it.
One by one, weigh each ingredient, pressing “tare” between each addition so your scale resets to zero before the next.
Once all ingredients are in the jar, stir thoroughly with a clean spoon or butter knife until the mixture is well blended and uniform in color and consistency.
Using a small funnel if needed, transfer your serum into the dropper bottle.
Label your bottle and store it in a cool, dark place.