If your scalp is very dry, sensitive or reactive to fragranced cleansers, introduce GOLDEN PHARM Birch Tar Shampoo carefully. The product is designed for oily roots and scalps prone to visible flaking, and tar shampoos can feel quite active. A cautious first step is to use it occasionally, then judge the result after washing and over the following day: the scalp should feel cleaner, not tight, burning or increasingly uncomfortable.
For colour-treated hair, it is sensible to be conservative. The provided product information does not state that this shampoo is colour-protecting, so alternate it with a milder shampoo if you are concerned about dryness, roughness or colour maintenance. When using it, concentrate on the scalp and let the lather rinse through the lengths rather than repeatedly scrubbing coloured or dry ends.
If you already know that your scalp reacts easily, consider testing a small amount during a short wash before making it part of your regular routine. Do not use it around the eye area. If irritation, persistent redness or unusual discomfort appears, stop using it and choose a gentler cleanser or seek professional advice.