Hair growth rate is not something you can alter much. In fact, there is no real way to grow hair at a fast rate. There are some products available that promise to increase hair growth rate, but these work only to help encourage hair growth. That is, they give your body the nutrients needed to ensure you reach your full rate of hair growth instead of being limited by deficiencies. Look for products that contain zinc in them, for example. If you are getting enough nutrients into your body, your hair will grow at the fastest rate possible for you, but don’t expect to see inches every week.
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