Use the Promise Undiluted - 15 ml, a carrier oil, and the empty rollerballs to create your very own DIY Promise Rollerballs.
Recipe for Promise Rollerball:
9 ml Carrier Oil
1 ml Promise Undiluted
Add 9 ml of a Carrier Oil to a clean and empty rollerball with included ml dropper. Then add 1 ml of Promise Undiluted, cap and then shake. Store upright in a cool and dark place.