There are many oils that are good for lashes, including argan, olive, coconut, and macadamia. Argan and coconut are also good for skin and are less likely to cause breakouts than heavier oils.
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Coconut oil hydrates and protects lashes, which helps maximize their growth. It solidifies at room temperature so it stays on lashes better than most other oils.
Eat a healthy diet including biotin-rich foods or a supplement, use conditioning mascara, avoid waterproof products, and apply a bit of oil at night, such as avocado or argan.