I have a sensitive scalp — what should I watch for before using this regularly?

Birch tar is a potent botanical distillate. While it has a long history in scalp cosmetics, its strong active compounds and characteristic scent can trigger reactions in people with reactive or barrier-compromised skin. Before the first full use, do a patch test: spray a pea-sized amount onto the inner forearm or behind the ear, leave on for 24 hours (do not wash the area), and observe. No redness, itching, stinging, or swelling means the skin likely tolerates it.

If the patch test is clear, start with one application on a small scalp area (for example, just the crown) rather than the whole head. Wait 24 hours again. If the scalp feels calm — no tightness, flaking, or increased sensitivity — you can expand to the full root area at the next wash.

Avoid using the spray on broken skin, fresh scratches, or areas with active eczema, psoriasis flare-ups, or sunburn. The product is a cosmetic for care and conditioning, not a treatment for diagnosed scalp conditions. If you have a chronic scalp disorder, are pregnant or breastfeeding, or use prescription topicals, consult a dermatologist or pharmacist before adding this to your routine. Discontinue use if irritation develops and does not resolve within a day of stopping.