This shampoo's functional composition and clarifying nature mean it may not be suitable for all hair and scalp types straight away. The source material specifically advises caution if your skin is very sensitive, colour-treated, or easily irritated.
If you fall into these categories, it is prudent to start with less frequent use—perhaps once a week or every other wash—to see how your scalp responds. Avoid leaving the lather on for more than a minute. Watch for signs of increased dryness, tightness, or irritation. If you experience any discomfort, discontinue use. For colour-treated hair, the clarifying action may potentially contribute to faster colour fading, so you may want to use it sparingly or alternate with a colour-protecting conditioner.
As with any new personal care product, performing a patch test on a small area of skin before full application is a sensible precaution. This product is not a substitute for a balanced hair care routine tailored to your specific needs.