Category Archives: Rodney Sinclair

The Arrector Pili Muscle (aka Goosebump Muscle)

I originally wrote this post on the arrector pili muscle (APM) in 2017, with an update in 2020.

Recently, I discovered a 2021 video in which the semi-retired dermatologist Dr. Andrew Messenger of the UK makes some important claims. He thinks that current hair loss treatments mainly impact the hair cycle. They do not reverse miniaturization, and he presents proof of this phenomenon.

Moreover, he theorizes that the structural changes in miniaturized hair follicles are perhaps more profound that previously foreseen. In particular, the irreversible destruction of the arrector pili muscle and subsequent fat infiltration. He presents an image from Dr. Rodney Sinclair’s 2014 paper on this subject, which I discussed in one of my past updates further below.

However, I am skeptical about the irreversibility of hair regrowth once the APM is beyond repair. It seems like Dr. Ralf Paus in the second half of the above video is also optimistic about the potential reversal of miniaturized hairs via a number of treatments.

I am especially curious as to how hair transplants on people with extensive Norwood 5-6 level balding work so well (since arrector pili muscles throughout their scalp are destroyed). Even body hair to scalp transplants often work well (especially beard hair). Can body hair follicles that are moved to the scalp help reinvigorate dead arrector pili muscles? Or can you actually move arrector pili muscles from the body to the scalp?

Also of interest, there are quite a few spectacular male-to-female transition hair growth results that are solely credited to medications such as Dutasteride, Spironolactone and Estrogen.

Please see the section titled “My Points of Contention” at the bottom of this post, where I elaborate further on these arguments. I have e-mailed both doctors to see if they have any further feedback.

Update: August 7, 2020 

Goosebumps, the Sympathetic Nervous System and Hair Growth

Yesterday, Taiwanese and US researchers published an important paper titled: “Cell Types Promoting Goosebumps Form a Niche to Regulate Hair Follicle Stem Cells.” The work was led by Dr. Lin Sung-jan of National Taiwan University, in collaboration with researchers from Harvard University (US).

Arrector Pili Muscle and Goosebumps
Goosebumps, Arrector Pili Muscle and Hair Growth.

The scientists made some important discoveries in relation to the arrector pili muscle (APM), and the sympathetic nervous system. The APM maintains sympathetic innervation to hair follicle stem cells. (HFSCs) The sympathetic nerve activates HFSCs via synapse-like contacts and norepinephrine. An important quote:

“APMs are often lost in the scalp skin of people with androgenetic alopecia. It is possible that in such skin, loss of APMs leads to the loss of sympathetic nerves, making HFSCs more difficult to activate. Our results also suggest the potential of using selective β2 agonists to promote HFSC activation.”

Lin’s team found that the biological mechanism behind baldness in men is closely connected to the sympathetic nervous system. Hair follicle stem cells activate after receiving signals via what are known as ADRB2 receptors. Based on these findings, the researchers hope to develop small molecule drugs that can activate ADRB2 receptors as a means of regenerating hair.

Goose bumps are a sympathetic nerve response involving the contraction of tiny muscles all over our bodies. These arrector pili muscles causes hair to stand up straight on the skin when we are fearful and under threat. The scientists aim to ultimately control the muscle-nerve system that drives hair regeneration. A video of these findings is embedded below. It is quite something to see Dr. Lin Sung-jan being mobbed by the media.

Jan 10, 2017

Androgenetic Alopecia: New insights into the role of the Arrector Pili Muscle

Several weeks ago, the arrector pili muscle got significant coverage in a few newspapers around the world. Famed Australian dermatologist Dr. Rodney Sinclair co-authored an important paper titled “The arrector pili muscle, the bridge between the follicular stem cell niche and the interfollicular epidermis” that was just published this month.

Dr. Sinclair has been involved in this area of hair loss research for a few years. See his 2014 paper titled: Beyond goosebumps: Does the arrector pili muscle have a role in hair loss? Also see the very interesting new insights on the APM section of his website. Australian newspapers were especially interested in this latest study and its findings as evidenced by articles such as this one and this one.

The Arrector Pili Muscle

Arrector pili muscles are small muscles attached to individual human hair follicles on both the scalp as well as body (so we have millions of these muscles throughout our bodies). Contraction of these muscles causes hairs to stand up, a phenomenon that is known as goosebumps. Therefore, the musculus arrector pili is often referred to as the goosebump muscle.

Every hair root is connected to the arrector pili. This smooth muscle contracts in response to signals from the “fight or flight” sympathetic nervous system.

Arrector Pili Muscle Degeneration and Hair Loss

In recent years, a few studies have come out that suggest a possible connection between the arrector pili muscle degenerating (where it gets replaced by fat) and hair loss due to the subsequent disconnection between various hair follicle stem cell populations. It is possible that an intact arrector pili muscle plays a crucial role in the maintenance of follicular integrity and stability.

However, there are many uncertainties about this theory that I discuss in the next section. It seems that while in alopecia areata (AA) patients the arrector pili muscle remains intact, this is not true in androgenetic alopecia (AGA) patients. Unfortunately, over 95 percent of balding men suffer from AGA. So this could be why it is much easier to grow back hair for people with AA compared to people with AGA.

However, the rate at which the arrector pili muscle degenerates and gets replaced by fat varies substantially between patients and between individual hairs on the same scalp. Some miniaturized vellus hairs in balding regions might even never lose most of their arrector pili muscle connection.

My Points of Contention

  • According to Dr. Sinclair’s own quote from a past paper, “It remains unclear whether arrector pili muscle regression is a cause or effect of permanent follicle miniaturization“. I think this is the crux of the issue surrounding this theory/hypothesis.
  • I am curious why hair that is transplanted from the back of a person’s scalp to the front grows so well if the arrector pili muscles in front have been destroyed? Surely the transplanted hair cannot just automatically regenerate the arrector pili muscle?
  • Related to the above, an important Japanese study from 2012 concludes that correctly transplanted hair can re-enable “connectivity and cooperation” with the arrector pili muscle and nerve system. In effect, it might be very possible to reactivate or regenerate the APM.
  • In Dr. Tsuji and his team’s groundbreaking technology “the transplanted primordium also forms connections with surrounding tissues (arrector pili muscle and nerves) and repeats normal hair cycles”.
  • There are 100s of online anecdotal reports with before and after photos of people regrowing long-lost hair in bald scalps. Miracle results are especially common in people undergoing male-to-female transition regimens. You can also find many reports of surprising hair regrowth in many old men who recently started taking dutasteride for enlarged prostate issues. Maybe they regenerated their arrector pili muscles; or maybe those muscles always remained intact in spite of severe AGA; or maybe one can regenerate hair without the need for having any intact arrector pili muscles?
  • It is unclear when exactly we have a point of no return where the arrector pili muscle is largely or entirely replaced by fat and hair stops growing (either as a cause or effect). It seems like there is significant variation depending on person and hair follicle. In many cases, the arrector pili might not be entirely degenerated and replaced by adipose tissue even in areas of the scalp where one has been bald for several decades. In such cases, subsequent hair and muscle regeneration could then be possible via something like Dutasteride or Finasteride.

The Hairy Pill and Dr. Rodney Sinclair

Last year, I covered oral Minoxidil for hair loss in detail. One of the main proponents of this hair loss treatment is Dr. Rodney Sinclair of Australia. He is a world renowned highly respected dermatologist and hair loss specialist.

July 2022 Update:

The manufacturer sent me the following e-mail summary:

The Hairy Pill® for men is a pharmaceutical compound in one single pill, which you would take daily, containing:

  • A starting dose of Minoxidil (low if the patient has never had oral Minoxidil before or a converted dose if the patient is taking topical Minoxidil) to stimulate hair growth, reduce thinning/loss and increase and thicken your hair.
  • A starting dose of Finasteride (low if the patient has never had it before or matching if the patient is currently taking Finasteride) OR Dutasteride (depending on the patient and severity of hair loss) to stop your hair loss in its tracks.
  • A collection of vitamins to promote healthy hair. Your hair is alive, so the healthier you are, the better your hair will be.
  • A collection of elements for regenerative purposes. These elements assist in strengthening and improving your hair as it grows.
  • A collection of amino acids (proteins) to provide the building blocks for the above active ingredients. These proteins assist in the building of your hair follicles.

Please note as the pill is compounded each time the doctor can add or exclude ingredients as needed. Some patients choose to have both active ingredients in the pill (Finasteride OR Dutasteride + Minoxidil combination), and some choose to have the one active ingredient (Minoxidil). Either option provides an effective treatment.

The women’s version includes Spironolactone.

The Hairy Pill®

In 2019, a company associated with Dr. Sinclair released something called The Hairy Pill (registered trademark). While the company website does not seem to mention oral Minoxidil, I am guessing that this pill contains Minoxidil as the key ingredient. Some online discussions suggest it also contains Finasteride, but I am not as yet certain.

The Hairy Pill results page has many before and after photos, of both men and women. Also make sure to visit their Instagram page and their Facebook page.

The reason I decided to write about this pill today is due to the following Australian video that was just released:


  • So far, the Google reviews and ratings for The Hairy Pill are a perfect 5/5 stars. Even after accounting for fake reviews, it is rare to see Google reviews averaging 5 stars. I am sure this rating will decline going forward.
The Hairy Pill Reviews
The Hairy Pill Google Reviews.

The Hairy Pill Cost and Side Effects

The monthly cost of 30 Hairy Pill capsules tablets is $75 for both males and females. You supposedly get personalized dosing and doctor consultations every 3 months, 6 months, 12 months and beyond. Sounds very professional, even though I would prefer them declaring the ingredients with full transparency.

It does not seem like anyone is reporting serious side effects so far, based on all the customer reviews that I read. According to the company itself:

“The underlying technology of The Hairy Pill® has been clinically tested by Professor Sinclair and his team via his clinical research company Samson Clinical.”

Note that I do not get any kind of commission from this product, and have not tried it myself. I assume that “The Hairy Pill” is available for shipping worldwide, but need to get confirmation.