DermaProof Asia describes in vivo evaluation and quantification methods of hair greying treatments, something that is becoming more relevant because of their direct relevance to the substantiation of claims.
Hair colour has long been a symbol of youth and health. The progressive loss of pigmentation in the hair shaft (hair greying or canities) is one of the most obvious signs of ageing, being not only an aesthetic concern but also a social and psychological challenge for many individuals.
These perceptions can result in decreased self-esteem, social withdrawal, reduced professional opportunities, and more generally in a decline in the quality of life. It has been reported that worldwide 6—23% of people have 50% grey hair by 50 years of age.
Onset of greying typically begins in the mid-30s for Caucasians, the late-30s for Asians, and the mid-40s for Africans. When the onset occurs earlier, canities are referred as premature. In men, grey hair typically begins at the temples and sideburns, then spreads to the vertex and lastly to the occiput whereas in women greying develops at the boundaries of the scalp and moves towards the vertex.1
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