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Dexamethasone speeds up hair loss in mice, while cyclosporin A slows it down.

α-MSH and cyclic AMP boost melanin production, while cyclic GMP and melatonin reduce it.

Aδ-LTMRs have complex synapses with glycine, while Aβ-LTMRs have simpler ones.

High levels of testosterone and dihydrotestosterone inhibit hair cell growth, while high levels of estradiol promote it.

MMP-2 and MMP-9 help hair grow, while their inhibitors peak when hair growth slows.

Higher hair levels of calcium and magnesium are linked to higher body weight, while lower levels are linked to worse metabolic health.

The occipital region is best for measuring cortisol and cortisone, while the posterior vertex is better for OEA, SEA, and PEA.

Testosterone and dihydrotestosterone slow hair cell growth, while estradiol has no effect.

A new method accurately measures amino acids in treated hair, showing bleaching reduces amino acids while protein treatments increase them.

Blocking Rab27a slows hair growth, while blocking Rab27b encourages it.

The shampoo effectively defines and models curls while reducing frizz and volume.

Natural hair is a return to its original state, while modifications signal social pressures.

Higher cortisol levels are linked to poor coping, while higher DHEA levels are linked to job confidence.

Moderate immune responses help hair growth, while excessive responses slow it down.

Panax ginseng extract helps human hair grow by encouraging growth phase transition and cell proliferation while reducing certain protein expression.

One Ashwagandha extract may help protect cells with its antioxidant properties, while another could promote hair growth.

Fish-derived collagen may help hair grow longer and affect hair stem cells, while bovine collagen could benefit hair stem cell maintenance, potentially aiding in hair loss conditions.

Activin A speeds up ear hair cell differentiation, while Follistatin slows it down.

Activin A increases inner ear hair cell development, while follistatin decreases it.

Higher fluence in hair removal damages hair follicles more, while lower fluence mimics natural hair regression, with long-term IPL treatments effectively reducing hair.

Cyproterone slightly inhibited hair growth in castrated mice, while tamoxifen significantly inhibited hair growth in castrated mice but not in normal mice.

Small white dots on the scalp seen with a dermoscope correspond to sweat ducts and vary with different hair disorders.

Walter P. Unger suggests using advanced hair transplant techniques for broader coverage, as they provide natural results and use donor tissue efficiently, while also recommending personalized planning due to the unpredictable progression of baldness.

Minoxidil in distearyldimethylammonium chloride vesicles significantly promotes hair growth, while minoxidil in microparticles or poloxamer solutions doesn't.

Women's hair has more sulfur, and black hair has more calcium than white hair.

Vitamin A deficiency changes cattle hair structure, while pregnancy may improve it, suggesting hair can indicate cattle health.

Women's hair treatments in ancient Mesopotamia involved amulets, while men's treatments used topical applications.

Perming significantly changes hair's molecular structure, while shampoo and conditioner do not.

Cortisone suppresses hair regrowth, especially undercoat hair, while adrenalectomy affects hair growth differently in rabbits and rats.

Transgender and nonbinary individuals experience hair loss, with transmen on testosterone seeing more severe hair loss, while feminizing hormones may stabilize hair loss in transwomen.