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Depressing - and stressful - as it sounds, stress is a hugely dominant factor in the strength of our hair. Yes, the physical manifestation of stress causes nerve damage as well as a reduction in keratin, resulting in hair loss. 

On the plus side, however, Phylia de M has made it its life's work to tackle the problem of thinning, damaged, unhappy hair, Re-Connect being its most potent hair strengthening serum yet. Just spray onto the roots of damp hair each time you wash it. Combining aloe, tannic and fulvic acids, the concentrated serum encourages the body to produce more keratin to keep hair strong and growth consistent. 

Half of Hollywood is on the stuff. 

Phylia De M. Re-Connect, £60 at Victoria Health