How Long Does Hair Typically Grow?
Everyone's hair is genetically programmed to stop growing at a specific length. When hair stops growing, it enters a resting phase, falls out, and eventually regrows. On average, a hair grows for two to seven years, so the ultimate length of any given hair strand depends on how quickly your hair grows.
Most people can expect about a half inch of growth each month. If your hair grows at this rate, you can expect a maximum hair length of 12 to 42 inches.
Some people have longer hair growth cycles. There's some evidence, for example, that people of Asian descent tend to grow hair more quickly or for longer periods—perhaps explaining why Quiping was able to grow her hair so long.
Factors Affecting Hair Growth
You can't change genetics, which set upper and lower parameters for hair growth, but a number of other factors can affect hair growth.
Scalp health: Infections dryness, and frequent irritation of the scalp can slow hair growth.
Hair follicle health: If your hair follicles are damaged, your hair will stop growing sooner and may not grow at all. Frequent hair-pulling can damage hair follicles.
Hair breakage and hair shaft health: With the exception of the area immediately surrounding the follicle, hair is made of dead cells. That means that a better diet, hair vitamins, and other factors won't improve the overall health of your visible hair. They'll only alter the hair follicle, potentially improving growth.
But an unhealthy hair shaft can still affect hair growth for one simple reason: damaged hair tends to break off more easily. Reduce breakage and improve shaft health with a hair oil such as the MOROCCANOIL Original Oil Treatment 100ml or try a serum to restore hair fibre Kérastase Résistance Extentioniste Serum 50ml.
Physical health: Your physiological health can affect the health of your hair follicles. A healthy diet rich in vitamins and nutrients improves follicle health, while nutritional deficits can slow hair growth. If you want to improve hair health from within, consider a biotin-based supplement such as Viviscal Maximum Strength Hair Supplement - 1 Month Supply