The treatment, which costs as little as £15 a go, is reported to leave hair feeling stronger and thicker – and the effects last for up to ten washes.
Devised by experts at L'Oreal Professionnel, the magic formula contains molecules that seek out and attach themselves to areas of damaged keratin – the protein which makes up hair fibres.
Then, according to the inventors, the molecules get extra busy by penetrating the hair shaft to seal gaps and breakages.
On top of that, vitamins and glossing agents can be added to the serum at the same time, giving longer-lasting results than other conditioning treatments, which sit on top of hair strands and need to be reapplied every time the hair is washed.
Kay Connelly, technical director for L'Oreal Professionnel, said: 'Hair is not a living organ and we don't feel pain when it is cut.
'But one end of it is deeply embedded in the skin of the scalp and, at one time, it has been alive.
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Cemetery Burlington