Apply Castor Oil.
Apply Vaseline.
Apply a mixture of castor, coconut & olive oils.
Eyelash surgery, where they'd sew individual hair on your eyelids.
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I've read every article on eyelash thickening tips, but never tried any. I have never even seen Castor Oil in real life, but I swear I've been meaning to get it for my lashes since I was 18 years old!
I've only tried using Vaseline, which did improve the density of my lashes, but it always made my vision blurry when it got inside my eyes.....
....and now, I'm finally using the Etude House My Lash Serum....
This lash serum seem to be very popular, and it's one product with a lot more good reviews than bad ones. I think it's because it's not an overpriced eyelash product, that arouses high expectations. Everybody can try it, and keep buying it - like a convenience store lip balm.
Ingredients (taken from Etude House website): Water (Aqua), Butylene Glycol, ethanol, glycerin, phenoxyethanol, polyacrylic acid, tromethamine, blood not -32, blood not -6, disodium this dithiol this (???), dangyak extract, carbonate, biotin, sodium hyaluronidase, Maltodextrin, Ginseng Extract, Ethylhexyl Glycerin, iris extract, Aloe Vera leaf extract, Yellow No. 4.
*I see no Parabens on this list, whereas I've seen some sites list the common parabens. So, I really don't know.