Castor Oil For Hair Growth - This eyelash growth serum could help your Eyelashes and Eyebrows full again. There is nothing like waking up to long eyelashes and stunning eyebrows. The best time to treat your eyelashes or eye brow is before you go to bed. Just a small dip on your lash line or eyebrow in the lash growth serum and it could leave your eyelashes and eyebrows looking healthier than ever!