Henna-based products colour the hair and can also touch the skin, so the safest approach is to treat it like any other tint: test before use. This powder contains henna as the primary pigment source, plus neem and amla, but natural ingredients can still cause irritation in some people.
To patch test, mix a very small amount of the powder to a paste and apply it to a small area of clean, dry skin — usually on the inner arm or behind the ear — and leave it for the same time you would leave it on your brows. Rinse it off and watch the area for 24–48 hours. If any redness, itching, burning, swelling or other reaction appears, do not use it on your brows.
Do not use this product on irritated, sunburnt, scratched or otherwise damaged skin, and avoid the eye area entirely. The product instructions are clear that contact with eyes must be avoided — if product gets into the eye, rinse thoroughly with clean water and seek medical advice if irritation continues.
If you have a known allergy to hair dyes or henna, or if you are pregnant, breastfeeding or taking medication, discuss it with a dermatologist or another qualified specialist before trying a new tint. If you have never used a henna brow tint before, you can ask a beauty professional to do a patch test and application the first time, so you can see how your skin tolerates it and how the shade develops on you.
Remember that any temporary colour change on the skin fades as the top skin cells are shed, but a skin reaction is not a normal part of the process — a comfortable, mild warm sensation is different from pain or persistent irritation. If a reaction occurs, stop use and do not reapply.