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Growth Rate
Hair grows at a rate of approximately one-half inch each month or 6 inches in a year. However, growth will vary from person to person and may be less where there are certain factors such as pregnancy, breastfeeding, malnutrition or hormonal imbalances.

Promoting Hair Growth
The best way to promote hair growth is a diet rich in protein. Foods such as meat, eggs, soy and legumes are packed with protein to build strong cells throughout the body. Consistently trimming the hair will keep the overall shafts stronger as it prevents the ends from splitting in half and dividing the shaft into two weakened pieces. Finally, supplements such as vitamins E and D encourage healthy cell division and may speed up the overall hair process.

Read more: How Much Does Hair Grow in 1 Month? | eHow.com http://www.ehow.com/how-does_5199805...#ixzz13Wg1qRbo