These are the ‘facts’ about castor oil and eyelashes. (That’s ‘facts’ with quotes around it, because there’s no scientific literature to say it’s true, but it’s what a lot of people have found out for themselves.)
No matter how much you love your eyelash extensions, there will come a time when you will either feel yourself, or your therapist will suggest, that you take a few weeks off to let your natural eyelashes get back to full strength on their own, without any extensions sitting on them. If so, you will probably very soon be quite eager to be able to have eyelash extensions again. So, you will want to do what you can to restore the strength and length of your natural eyelashes as quickly as possible.
Enter, castor oil. Castor oil is meant to be one of those remedies which lead to fast-growing and thick eyelashes. Castor oil apparently doesn’t just assist in healthy growth, it also prevents existing eyelashes from breaking, because it moisturises and reduces the risk of brittleness. It’s even claimed that it promotes eyelash growth where few lashes existed before. Wow, definitely worth trying.
To apply the apply castor oil, you must first get rid of any traces of make up on your eyelashes and eyelids. Then you can apply castor oil onto the eyelashes with a an eyeliner brush (not one previously used for mascara obviously!). It’s best to do it at night before you go to bed, so it can work while you are asleep. (It works while you sleep? This just gets better and better.) You can get the residue of the castor oil off your eyelashes in the morning with make-up remover. (It will probably insist on doing it itself.)
There’s castor oil and castor oil, apparently. You should make sure to use only pure cold-pressed castor oil. Cold-pressed castor oil is extracted from castor bean seeds, by applying pressure to the beans and squeezing the oil out. I would also guess they are cold at the time. This is considered to be the best way to preserve all the nutrients in the oil and other minerals and fatty acids, which could be destroyed by other methods of obtaining oil, such as heating or chemicals.
So, cold-pressed castor oil is the way to go. (Have you noticed by the way how almost everything in an expensive plastic bottle on a supermarket chilled shelf has to be ‘cold-pressed’ these days?)