"This day and night wonder has a light, silicone-free formula that penetrates each strand to give you a frizz-free sheen and natural protection from damaging elements during the day. At night, use as a leave-on treatment to allow soybean, broccoli, and sunflower oils to deeply nourish your hair as you sleep – to bring back its natural healthy state!"
BONUS Beauty Tip from Human Nature's Website:Build the day and night hair serum habit!During the day, hair is subject to heat, pollution and other environmental stress that could damage it. Give your locks the proper protection by smoothing on the hair serum before you leave the house. Complete your routine by letting your hair soak all the goodness of soybean, broccoli and sunflower oils at night, while you sleep to help restore your hair’s healthy state.
* Please refer to the comment I posted on Oct. 19, 2014 for some clarification made by Human Nature,