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The article concludes that advancements in hair cosmetics require dermatologists to stay informed about products and their potential risks, including allergies and higher risks for hairdressers.

Germ-free rats need biotin for growth and have different vitamin metabolism compared to regular rats.

Different ethnicities and treatments affect human hair strength and structure.

New hair products are being developed to keep hair and scalp healthy for everyone.

New methods to make oxasteroids show promise for medical treatments like osteoporosis and breast cancer.

Cysteine helps maintain keratin production in skin cells even when iron is low.

Brazilian keratin treatments can straighten hair but may contain harmful formaldehyde.

Finasteride affects urinary steroid profiles and can potentially hide steroid abuse in sports drug testing.

Different species and human skin models vary in their skin enzyme activities, with pig skin and some models closely matching human skin, useful for safety assessments and understanding the skin's protective roles.

Changing the amount of PLC5 in Arabidopsis affects root growth and drought resistance, with less PLC5 slowing root growth and more PLC5 improving drought tolerance but hindering root hair growth.

New sulfur-containing steroid analogs show promise for more targeted medical treatments.

Bone-marrow and epidermal stem cells help heal wounds differently, with bone-marrow cells aiding in blood vessel formation and epidermal cells in hair growth.

Enzymes xylanase and pectinase clean wool and specialty hair fibers effectively without damage, offering an eco-friendly alternative to soap and hot water.

Minoxidil improves blood flow and vessel flexibility, potentially helping with vascular stiffness.

The conclusion is that small hair follicles cause baldness in macaques, and treatments like antiandrogens and minoxidil can prevent hair loss and promote regrowth.

Black women's unique hair characteristics and styling practices can lead to specific scalp conditions, which require early diagnosis and appropriate treatment.

Most women preferred the 1% pyrithione zinc shampoo for better hair smoothness and less frizz while controlling dandruff.

Ziziphus jujuba Mills may have health benefits, but more research is needed to confirm its safety and effectiveness.

Anthralin is effective for psoriasis and alopecia with minimal systemic side effects but can irritate the skin.

Cosmetic hair products are important for hiding hair loss and improving satisfaction when combined with medical treatments.

Oral retinoids are effective for treating severe skin disorders but have reversible side effects and risks for pregnant women.

Minoxidil metabolizes similarly in monkeys and humans, but differently in dogs and rats.

Chitosan and surface-deacetylated chitin nanofibers may help treat hair loss.

The study concluded that three enzymes are important for plant development by affecting sugar composition and calcium binding in plants.

The new lab-grown skin model is good for testing sunscreen's protection against DNA damage from UV light.

Menopausal women have higher androgen levels, which can cause symptoms like facial hair growth and low sexual desire.

Testosterone therapy aims to treat hormone deficiencies and various conditions safely and effectively, but requires careful patient monitoring due to potential side effects.

Hair and scalp disorders significantly affect self-esteem, and using cosmetic products like conditioners and styling aids can improve hair health and appearance.

α-type filaments in guinea pig hair follicles have unique structural features.