The formula is built around conditioning oils and plant extracts, and the description says it suits people who shape brows regularly, use brow tint or makeup, or want a simple evening grooming step. That profile includes many people with fairly reactive skin. Still, because the product is used very close to the eye area, a careful approach is wiser than an enthusiastic one.
Before your first full use, you can do a small patch test on the inside of your forearm or behind your ear and watch for redness or itching over 24 hours. If you have sensitive eyelids, start by applying the oil only to your brows for a few evenings, then add the lash line if everything feels comfortable. Contact lens wearers should insert lenses before applying the oil and remove any residue before handling lenses again; oily fingers can leave a film on the lenses and cause discomfort.
The general safety rules are straightforward: avoid getting the oil into the eyes, wipe off any excess that migrates toward the waterline, and do not use it on irritated or broken skin. If you notice redness, stinging, swelling or any other sensitivity, stop using the product and talk to a pharmacist or doctor. If you are pregnant, breastfeeding, have a chronic skin condition or are under medical care, consult a specialist before adding any new cosmetic to your routine.