Which ingredients are excluded from the formula and why might that matter?

This shampoo leaves out several ingredient groups that some people prefer to avoid: parabens (a class of preservatives), MIT (methylisothiazolinone, another preservative linked to sensitisation), silicones (which can create a coated feel and build-up over time), mineral oil (an occlusive petroleum derivative), synthetic fragrance, and dyes. The absence of silicones and mineral oil means the product cleans without leaving a heavy film, which can be helpful for finer hair or for anyone who dislikes a weighed-down sensation. Removing fragrance and dyes reduces the potential for irritation, making the formula a consideration for those with reactive scalps. However, even a minimal formula can cause reactions in highly sensitive individuals, so the manufacturer advises introducing it gently and stopping use if irritation appears. The preservative system used instead of parabens and MIT is not specified in the provided information.