How Many Hairs are there on a Human Head?

It is said that humans first notice their scalp hair loss only after one-half of existing head hair has disappeared. I am not sure if this is a proven fact. I would have guessed that one would notice significant hair loss even after one-quarter of ones locks have disappeared. The normal rate of daily hair loss varies significantly from person to person.

Number of hairs on human head.
How many hairs are there on a human head?

In any event, that got me thinking as to how many hairs there are on an average human head? It seems like the answer is surprisingly easy to find, and researchers are in general agreement about the statistics.

How Many Hairs on the Human Head?

Answer: The range is from 90,000 to 150,000 hairs on the average human head.

A typical human scalp measures 120 square inches (774 square cm). According to Harvard Biological Numbers database, The color of your hair makes a difference as to how many strands are on your head:

  • If you are a blonde, you likely have the most hair at birth at around 150,000 follicles.
  • Brown haired people have an average of 110,000 hair follicles.
  • Black haired people, who represent a majority of the world, are born with 100,000 hairs.
  • And last but not least, possibly soon to be extinct redheads have only 90,000 hair follicles. Only 2% of humans are redheads.

Note that the entire human body has around 5 million hair follicles. The only areas of your body that have no hair (vellus or terminal) are the palms of your hands, soles of your feet, nipples, lips and parts of the genital regions.

Brief Items of Interest, August 2017

A few days later than usual due to the major new developments that I had to discuss in my prior two posts.

Hair loss news first:

— I covered an interesting “COOL” new company named PolarityTE last month. A new article about the company mentions a possible product rollout in early 2018. Although focused on regenerating the skin (especially for burn victims), the technology will also include hair regeneration on the new skin.

— I covered Dr. Lu Le and his team’s groundbreaking discovery related to the biological processes behind both hair loss and grey hair in a post from May of this year. Now their local Dallas newspaper has much more detailed coverage of Dr. Le and his work. An interesting read.

— The first ever International Hair Restoration Conference was held in Vancouver, Canada in April 2017. During the past two months, the organizer has been releasing some interesting videos from the conference, including from the generally reclusive Dr. Kevin McElwee (Replicel) and Dr. Ray Woods (FUE hair transplant pioneer). Note that Dr. McElwee wrote most of the material on keratin.com (and he used to run the now nonexistent hair loss forums on there). Moreover, he is a co-author of an interesting new paper on hair loss  titled “Experimental and early investigational drugs for androgenetic alopecia“.

— Histogen’s proprietary “multipotent cell conditioned media” will be marketed by leading global cosmetics concern Allergan via the Regenica line of product. Although not related to Histogen’s main Hair Stimulating Complex (HSC) hair loss product, it is worth noting that Allergan has several hair loss products (Bimatoprost and Setipiprant) that it is also developing. Perhaps they could purchase the rights to the HSC product in the future too?

Very interesting study from Iran. Conclusion: “Our data showed that injection of a combination of adult human cultured dermal papilla and epithelial cells could induce hair growth in nude mice”.

— Denmark’s Harklinikken is definitely not a miracle product for hair loss treatment, but it seems like it may have some benefits per the NY Times (h/t commentator Rene). And the company has major expansion plans for the US market. Their product is derived from cow’s milk and various plants.

And now on to medical items of interest:

US scientists make genetically modified embryo. First ever case in the US. More here.

Breakthrough device heals organs via touch. Extremely hard to believe, but the research comes from a reputable university. The device delivers new DNA or RNA into living skin cells in order to change their function:

— Scientists successfully make old human cells younger via lengthening telomeres.

— Some retinas are indestructible and do not need regeneration:

Trump Hair Eclipse

Harvesting the blood of the young.

New high resolution 3D printing of live tissues.

Blood test detects Alzheimer’s plaques in brain.

Zion Harvey update. I covered this story several times before on this blog if you do a search.

Stem cell brain implants could extend lifespan 10-15 percent.

3D printing revolutionizing plastic surgery.