eyedropper (makes it easy to dispense your formula later). ALL recipes are for EACH FLUID OUNCE, so you'll want to recognize the dimensions of our bottle to make measuring less complicated. A funnel might Bio Derme Serum make matters less difficult as well. And of course your selected base oils and essential oils (word for getting oils -- the recipe requires drops, and essential oils are sold in milliliters -- there are 25 drops in keeping with milliliter). Mixing instructions: Add the desired range of drops of every essential oil on your empty bottle. If making 2 oz, double the amounts, four oz., four instances, and so on. With a . https://www.healthestablished.com/bio-derme-serum/