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The science of hair

The NIOXIN definition of hair thinning is having fewer hair strands, finer hair strands, or a poor scalp environment for hair to grow from. Each of these three signs, developed from scientific observation and stylist and consumer insights, has a basis in biology.

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POOR SCALP ENVIRONMENT

Healthy, deeply rooted hair comes from a scalp that is clean and free from debris. Build-up of sebum or products blocks hair follicles and can prevent new hair coming through the skin and maturing. In time, the lack of new growth will make hair look increasingly thin.

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FEWER HAIR STRANDS

Hair has three growth phases. In order for the newest hair to mature, the scalp needs to be kept clean and hair needs to be protected from damage and breakage – one of the most common causes of thin-looking hair.

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FINER HAIR STRANDS

When hair goes through its full lifecycle, it looks full and thick. However, changes in our diet, stress levels, health and living environment can shorten the lifecycle, preventing it from maturing and causing regression to smaller, finer hair.

© 2012 The Procter & Gamble Company.