Hair Regrowth Rate – What Is It?

Hair regrowth rate is defined as the amount of hair growing back after a treatment. There are several factors that influence hair growth. For example, there are differences between Caucasian and African hair. But how can you determine how long does it take for hair to grow back? Fortunately, there are a few factors that can help you make an educated decision.

Therapeutic hair regrowth rate

The current meta-analysis aimed to synthesize the available evidence on therapeutic hair regrowth rates. The primary outcome was the rate of any regrowth, and secondary outcomes included the incidence of adverse events and recurrence. The included studies were categorized into four categories based on the type of regrowth, including minor, significant, and cosmetically acceptable. Among those with alopecia areata, the overall rate of any hair regrowth was 65.5%, and a total regrowth rate of between 30% and 100% was found in subgroups.

The results of this study will be used to help practitioners provide more detailed information to patients. This will help them understand how their patients respond to the treatments. The study will also help practitioners develop a treatment plan for their patients. It will also help practitioners better understand the mechanisms involved in regrowth. This will make the treatment more effective.

Factors that affect hair growth

According to research, hair grows about half an inch per month. But this average is influenced by a variety of factors, including age, genetics, and hair type. Male hair tends to grow much faster than that of a female. Hair growth rate is also affected by external factors, including health, pregnancy, and genetics. Hair grows much slower when it is damaged or prone to breakage. For this reason, hair stylists recommend regular trims to prevent breakage.

Hair growth rate also varies depending on gender, age, and hair color. For example, men’s hair grows about 0.41 mm per day, whereas women’s hair grows about 0.34 mm per month. In general, hair grows in two stages: the anagen phase, where hair follicles to produce new hair cells, and the catagen phase, where new hair follicles rest and new hair grow below.

Diet is another factor that affects hair growth rate. A deficiency of vitamins and minerals will negatively impact hair growth. It will make hair appear thinner and lack shine and can even cause breakage. But the question remains, how long does it take to grow eyelashes back? However, a healthy diet contains a wide range of nutrients that promote healthy eyelashes growth.

The Agency for Toxic Substances and Disease Registry provides historical information for the public health community. However, it is important to note that the ATSDR Web site no longer maintains the data provided there, so you may find that the data you find there is no longer accurate or current. In addition to genetics, the rate of hair growth also depends on sex and a person’s diet. A healthy diet is rich in protein and contains adequate nutrients for hair follicles.

Variations between Caucasian and African hair

The regrowth rate of Caucasian and African hair differs. Caucasian hair grows at a speed of 1.2 cm per month compared to African hair’s 1.3 cm per month. However, hair loss rates for all ethnicities are roughly the same, between 60 and 100 strands per day. This difference is likely due to individual genetics and traits, which may also vary. In some cases, the shape of the human skull affects hair growth.

The density of hair varies from ninety to 290 hairs per square centimeter, with the vertex showing the highest density. Similarly, the telogen percentage varies between 2 and 46% and is higher in men. The rate of growth varies widely among both sexes, although it varies less on the temporal region.

Caucasian hair grows at the fastest rate of all hair types, growing about 1.2 centimeters per month. In addition, Caucasian hair has the highest density. Blondes have 146,000 hairs on their heads, while blacks, brunettes, and redheads have an average of 86,000. Afro hair is predominantly black, with 50,000 to 100,000 hairs on the head. The slowest growth rate is 0.9 centimeters per month.


Hair-graying affects hair regrowth rates differently among Caucasian, Asian, and African people. Caucasians and Asians suffer damage to the distal portion of the hair shaft, while African-Americans experience damage closer to the hair root. While postmenopausal changes are part of the aging process, some factors can prevent hair aging prematurely. Proper grooming and styling of hair, proper hair coloring, and choosing suitable shampoos and conditioners are effective ways to prevent premature graying. Medical therapies can also treat underlying conditions that affect hair aging.