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Testosterone and dihydrotestosterone affect hair growth, and new techniques like the folliculogram help study it, but fully understanding hair growth is still complex.

Mice are useful for researching human hair loss and testing treatments, despite some differences between species.

Researchers found a genetic link for hereditary hair loss but need more analysis to identify the exact gene.

Researchers found 19 genes important for root hair growth in a plant called Arabidopsis.

Skin grafts on mice can cause an immune response leading to hair loss, useful for studying human hair loss conditions.

Hair grays due to oxidative stress and fewer functioning melanocytes.

Prolactin may affect hair growth differently based on gender and scalp area.

The new test can measure very small amounts of testosterone in hair, and grinding the hair up first gives more accurate results.

The hair test for vitamin D could be a useful alternative to blood tests, providing a longer-term vitamin D status, but more research is needed.

SM-215 promotes hair growth by improving the environment around hair follicles.

The conclusion is that effectively treating hair disorders is difficult due to the complex factors affecting hair growth and more research is needed to improve treatments.

The wigs made from human hair and polypropylene were mostly well-tolerated and durable in rabbits, suggesting they could be a new option for people with extensive hair loss.

A wearable device using electric stimulation can significantly improve hair growth.

Barley extract, specifically procyanidin B-3, can promote hair growth and counteract growth inhibition.

Hair analysis can show nutritional status and environmental exposure, with phosphorus being very stable in hair and differences found based on gender and conditions like depression and autism.

TGF-alpha is present in sheep and ferret skin and may affect hair growth without directly stimulating cell proliferation.

Zolpidem shows up in hair from the top back of the head after one dose and fades over time, suggesting it gets into hair through blood and sweat.

Shrunken heads retain some facial features and hair characteristics, allowing for limited individual identification.

Alopecia is a condition causing hair loss that can impact looks and mental health.

Oral minoxidil is as effective and safe as topical minoxidil for treating female pattern hair loss.

Alopecia areata is a reversible, autoimmune-related hair loss that can have significant emotional impact and uncertain treatment effectiveness.

New treatment combining PRP and SVF increases hair density in 6-12 weeks for androgenetic alopecia patients.

Permanent hair loss from cicatricial alopecia is treated by reducing inflammation and managing symptoms, but regrowth in scarred areas is unlikely.

Cedrol may prevent hair loss caused by chemotherapy better than minoxidil.

The study suggests that the arrector pili muscle is important for hair health and its damage might contribute to hair loss.

Tofacitinib helped regrow hair in most patients with severe hair loss.

No treatment fully prevents hair loss from chemotherapy yet.

Pomegranate leaf extract may help with hair growth, dandruff, and lice.

Annurca apple extract may help treat hair loss and protect against oxidative stress.

Cationic and nonionic surfactants provide better color intensity and resistance for semi-permanent hair dye than anionic surfactants.