Hedrin Kills Lice Leave In
A water-based leave-in head lice treatment using octane-1,2-diol, designed to stay on the hair for at least 8 hours and then be repeated after 7 days.
Best for Adults and children 6 months and over
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Description
Hedrin Kills Lice Leave In is strongest for families that want to apply treatment, leave it on through the day or overnight, and wash it out later rather than supervise a very short treatment window. It works best for households that are organised enough to complete the second treatment after 7 days.
It is less attractive if you want the simplest single-SKU row because the official page covers a treatment family rather than one exact bottle, but the underlying guidance is still clear enough for a broad, factual row.
Clear official UK guidance across age, ingredient, timing, and repeat schedule
Review
Editorial scores based on our treatment library review · Updated 2026-07-19.
0.0
Overall
Pros
- This official page covers a treatment family rather than one single-SKU bottle
- Not tested on hair extensions
- Not advisable directly before colouring or bleaching
- Shake the chosen format well before use.
Cons
- Make sure the scalp is covered and the hair is saturated from root to tip.
- Leave to dry naturally or use a hair dryer if preferred, then leave on for a minimum of 8 hours.
- Rinse or shampoo out and repeat the same process 7 days after the first treatment.
- Repeat the treatment after 7 days to complete the treatment properly.
How to use
- 1.Not tested on hair extensions, and official guidance says to check with a hairdresser if unsure.
Still unsure?
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