Cantu Flaxseed Smoothing Leave-In or Rinse Out Conditioner Say hello to hydrated hair! Cantu’s Flaxseed Smoothing Leave-In or Rinse Out Conditioner uses a unique silicone-free formula to moisturize dry, brittle hair. Crafted with pure shea butter, honey, vitamin E, olive oil, and flaxseed oil, our Smoothing Conditioner infuses your hair with all the nutrients needed to promote healthy hair growth.