Make sure you have all your ingredients ready. You'll need aloe vera gel, castor oil, and vitamin E oil.
In a small bowl, combine 2 grams (1/2 teaspoon) of aloe vera gel, 8 grams (1 and 1/2 teaspoons) of castor oil, and 4 grams (1 teaspoon) of vitamin E oil. Mix them well until they are fully combined.
Get an empty mascara tube and make sure it's clean. You can use a liquid dropper to transfer the serum into the tube. This helps keep things neat and prevents spills.
Carefully use the liquid dropper to fill the mascara tube with your lash serum. Make sure not to overfill it.
Use a clean mascara wand to apply the serum to your lashes. Dip the wand into the serum, wipe off any excess, and gently brush it onto your lashes from root to tip and on the upper lash line. Apply daily for the best results. Be careful not to get the serum directly in your eyes.
Keep your DIY lash serum in a cool, dry place. Use it regularly, preferably at night, to get the best results.