Sanitize your containers and equipment and be sure your work area is clean.
Next, weigh each ingredient on a precise scale and transfer to a glass dropper bottle.
Cap bottle and shake.
Rejoice at your fabulous elixir-making abilities.
Notes
Note that if you use a 1% black cumin seed oil for this serum, you'll use .3 oz. If you use a stronger one, like the 7% oil, you'll use .04 oz, which is hard to measure, but you could make a double or triple batch to make it easier.