Minimal and clean ingredients not only safe for the environment but also your scalp and hair! Also, by choosing organic, the ingredients aren’t made with pesticides. I have found that my bottles last twice as long as the aerosol cans I was using, equating to about 3 months when used regularly and work just as well. Essential oils not only smell delightful, but have hair growth benefits derived naturally and directly from the plant. No Poo shelf life is about 4 months due to keeping the pure essential oils stable all while offering the best product I can!