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The enzymes 5α-reductase and 3α/β-hydroxysteroid oxidoreductase help create brain-active substances from progesterone and testosterone, which could be used for treatment, but more research is needed to ensure their safety and effectiveness.

Nanotechnology improves cosmetics' effectiveness and safety.

Visible light can improve skin disorders and hair loss, but more research is needed to understand long-term effects.

Hair in mammals likely evolved from glandular structures, not scales.

Finasteride significantly reduced tics and obsessive-compulsive symptoms in patients with Tourette syndrome.

PDRN, derived from salmon sperm, shows promise in healing wounds, reducing inflammation, and regenerating tissues, but more research is needed to understand its mechanisms and improve its use.

Human skin's melanocytes respond to light by changing shape, producing pigments and hormones, which may affect sleep patterns.

Quercetin significantly helps hair growth by activating hair follicles and improving blood vessel formation around them.

THAP1 gene changes do not affect DYT1 dystonia; finasteride may help reduce tics and OCD in Tourette syndrome.

Home-based skin care devices are generally safe and effective for hair removal, promoting hair growth, treating wrinkles and acne, but results for psoriasis treatment are mixed.

Human hair varies widely and should be classified by curl type rather than race.

Hair significantly shapes body identity and social interactions, influencing how we perceive and relate to our bodies.

Spaceflight can harm skin health by altering gene expression, affecting DNA, mitochondria, and skin barriers.

Hexi cashmere goats' hair growth varies by stage, with Hoxc13 linked to hair activity.

A specific gene mutation is linked to a hereditary form of dystonia that responds well to certain medications.

The document concludes that hair biology is complex and there are still unanswered questions about hair loss and follicle changes.

Monocytes in hair follicles help neutrophils move through the skin in contact dermatitis.

Dynamic, light touch is sensed through a common mechanism involving Piezo2 channels in sensory axons.

Finasteride significantly reduced tics and obsessive-compulsive symptoms in Tourette syndrome patients.

Finasteride may help reduce tic severity in male Tourette syndrome patients.

Minced skin grafts speed up healing and improve scar quality at donor sites.

Compounds from certain trees used by First Nations people show potential for treating skin conditions and promoting hair growth, but more research is needed to confirm their safety and effectiveness.

A woman's unique dementia was misdiagnosed, a genetic mutation increases Parkinson's risk with age, and finasteride may help with Tourette syndrome.

Cellulose nanocrystals are promising for making effective, sustainable sensors for various uses.

Degenerative changes in the lower cervical spine are common in patients with abnormal scalp sensations, with some improvement seen using pain medication and physical therapy.

New biomaterials can improve wound healing by promoting nerve and tissue regeneration.

Skin structure complexity and variability are crucial for assessing skin toxicity in safety tests.

Natural ingredients can improve skin and hair, but more research is needed.

The skin's basement membrane is specially designed to support different types of connections between skin layers and hair follicles.

Older age and certain lifestyles are linked to thinner, weaker hair, while how you see your hair relates to its thickness.