Use the oil as the last step of your evening routine, when your face and the eye area are clean and completely dry. Take a small amount on the applicator and glide it along the brow hairs in the direction of growth. For lashes, apply a thin, even line along the lash line — the way you would apply an eyeliner — rather than coating the entire lash with a thick layer. One pass is usually enough: the oil has a light texture, but a little goes further than you expect.
Leave it overnight so the conditioning ingredients have time to work. In the morning, rinse with lukewarm water or remove it during your normal facial cleansing. Overuse rarely helps more; if anything, a heavy layer can look and feel greasy and make the area around the eyes look less neat.
Consistency matters more than how much you use. Applying it most evenings is a reasonable approach; it is a grooming step rather than a one-off fix. If your brows are shaped or tinted regularly, the oil can be part of your maintenance routine, but wait until any tint has fully settled before applying. As with anything used near the eye area, avoid direct contact with the eyes and stop using it if you notice redness, stinging or any other irritation.