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research Noggin is required for induction of the hair follicle growth phase in postnatal skin

211 citations , October 2001 in “The FASEB Journal”

This study found that the BMP antagonist noggin induces hair growth in postnatal skin by neutralizing BMP4's inhibitory activity, potentially mediated by changes in Shh expression.

research 219 STAT5 activation in the dermal papilla is important for hair follicle growth phase induction, hair follicle regeneration and wound healing

1 citations , August 2016 in “Journal of Investigative Dermatology”

This research reported that STAT5 activation in the dermal papilla plays a crucial role in triggering anagen entry during post-developmental hair follicle cycling.

research STAT5 Activation in the Dermal Papilla Is Important for Hair Follicle Growth Phase Induction

32 citations , April 2016 in “Journal of Investigative Dermatology”

This study found that STAT5 activation in the dermal papilla acts as a key switch to trigger anagen entry in postdevelopmental hair follicle cycling.

research Transcriptomic profiling of dermal papilla cells across growth phases, hair follicle types, and sexes in cashmere goats

July 2026 in “Scientific Data”

In this study, researchers analyzed dermal papilla cells from cashmere goats and identified 3,857 differentially expressed genes associated with hair growth phases, follicle types, and sex, providing a foundational resource for future efforts to improve cashmere quality and yield.

research 1428 DKK2 and SOSTDC1 cooperate to initiate the first catagen phase of the hair follicle growth cycle

April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology”

The study demonstrated that both DKK2 and SOSTDC1 are necessary for normal timing of the first catagen phase in mice hair growth cycles.

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Community Join

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community Pelage PP405: New Hair Growth from Inactive Follicular Units - Phase 2a results at AAD 2026

1080 upvotes 5 months ago

PP405, a topical treatment, shows promise for hair growth by activating inactive follicles, with 66% of participants experiencing positive results. The treatment is well-tolerated and may proceed directly to Phase 3 trials, offering a potential alternative to minoxidil and finasteride.

community PP405: The Ultimate Hair Loss Drug for Complete Hair Growth

211 upvotes 1 year ago

PP405 is a new hair loss treatment in phase 2 trials that may promote hair growth by increasing lactate production and activating hair follicle stem cells. It could potentially replace hormone-disrupting treatments like Minoxidil and finasteride.

community TDM-105795 phase 2 results are in!

27 upvotes 2 years ago

TDM-105795 showed promising hair growth results, with higher efficacy than placebo and minimal side effects. It activates dormant hair follicle stem cells and may maintain gains without immediate loss, unlike minoxidil.

community Functional hair follicles grown from stem cells: Scientists have created natural-looking hair that grows through the skin using human induced pluripotent stem cells (iPSCs), a major scientific achievement that could revolutionize the hair growth industry.

171 upvotes 7 years ago

Scientists have grown natural-looking hair from stem cells, potentially revolutionizing hair growth treatments. Concerns include cost, DHT resistance, and the need for future procedures.

community Baldness Breakthrough: microRNA Stimulates Hair Growth in Aging Follicles

316 upvotes 3 years ago

miR-205, a tiny RNA, can stimulate hair growth by softening aging hair follicle stem cells in mice. Future tests aim to see if this can work in humans.

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Learn

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learn Follistatin

glycoprotein that inhibits TGF-β and promotes hair growth by antagonizing activin

What is follistatin, and how does it influence hair follicle growth and regeneration? Follistatin blocks activin and related growth-inhibiting proteins, which in laboratory and animal work is described as keeping hair follicles in their growth phase; the only verifiable human evidence is a single small 2011 phase 1 injection trial, so follistatin remains experimental and is not an approved hair-loss treatment.

learn Hair Transplant

What happens after a hair transplant? Expect mild swelling and redness, with new hair growth starting in 3 to 6 months.

learn Stemoxydine

chemical from L'Oreal that encourages hair to enter growth phase

How does stemoxydine help stimulate new hair growth on the scalp? Stemoxydine stimulates new hair growth by promoting hair follicles to transition from the resting phase to the active growth phase.

learn Fluridil

Can daily Fluridil application stop hair follicle miniaturization? The single published fluridil trial (43 men, 9 months, double-blind and placebo-controlled) reported more hairs in the growth phase, but it never measured follicle diameter and has not been replicated — so whether daily use stops miniaturization is unproven, and community users describe stabilization rather than regrowth.

learn Platelet-Rich Plasma

growth factors taken from your blood and injected into your scalp to stimulate hair

What is Platelet-Derived Growth Factor Beta Polypeptide, and how does it help stimulate new hair growth? PDGF-BB is a growth factor that signals to dermal papilla cells and promotes blood-vessel formation; mouse studies report it can push follicles into the growth phase, and human evidence comes only indirectly from PRP trials. No PDGF product is approved for hair restoration and there is no published human trial of PDGF-BB on its own.

learn Exosomes

Microscopic delivery system that sends growth-promoting signals to hair follicles

learn Latanoprost

glaucoma medication with hair follicle stimulant effects

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