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The dietary supplement significantly improved skin, nails, and hair in older adults.

Targeted cancer therapies often cause skin reactions, so dermatologists must manage these effects.

Skin problems in older people can indicate hormonal diseases, nutritional deficiencies, or conditions like diabetes, menopause, and HIV.

The document reviews various hair and nail disorders, their causes, and treatments, emphasizing the need for proper diagnosis and the link between nail changes and systemic diseases.

The document is a detailed medical reference on skin and genetic disorders.

Hair and nails are skin parts that develop early and serve protective and functional roles.

Thallium, mercury, selenium, and colchicine strongly cause hair loss.

Selenium is essential for health, but too much or too little can cause problems; blood selenium levels are a good measure of intake.

Certain nail conditions can suggest thyroid problems, with different symptoms for underactive (slow, thin nails) and overactive (spoon-shaped, brittle nails) thyroid.

Coconut oil helps with brittle hair and infestations, castor oil may improve hair shine, and argan oil lacks evidence for hair benefits.

Monilethrix causes brittle hair and hair loss, and it runs in families.

COVID-19 protective measures led to skin irritation, hair loss, and brittle nails; using skin-friendly products and a healthy diet is recommended.

A 5-year-old girl has sparse, dry, and brittle hair but is otherwise healthy.

Using a hot iron on wet hair can cause dry, brittle hair with air bubbles inside.

A boy with monilethrix has brittle hair that breaks easily due to a genetic condition, which might improve by puberty.

Monilethrix is a genetic disorder causing brittle hair, diagnosed using tricoscopy.

Teprotumumab for thyroid eye disease commonly causes fatigue, brittle nails, dry eyes, hair loss, muscle spasms, and dry mouth, with rare serious events like blood clots.

Hair shaft disorders cause fragile, brittle, and abnormal-looking hair.

Pregnancy can cause more body and scalp hair growth and make nails brittle, but these changes often revert after giving birth.

Animal hair fibers like wool and mohair are strong when dry, but vicuna fibers are very brittle.

Acidic sandy clay damages archaeological hair the most, while dry conditions preserve but make it brittle; silicone oil can help keep the hair flexible.

Researchers created a mouse with the same mutation as humans with trichothiodystrophy, showing similar symptoms and confirming the condition is due to defects in DNA repair and gene activity.

Hair problems can be caused by genetics or the environment, and treatment should focus on the cause and reducing hair damage.

People with HIV and low T cell counts have more hair and scalp problems.

Moisture content significantly affects how human hair breaks.

Some congenital hair disorders improve in childhood or with treatments like minoxidil and retinoids, while others like Netherton syndrome and trichothiodystrophy have a poor prognosis.

The document concludes that parathyroid diseases have a range of clinical features and outcomes, with some conditions being treatable and others having a high risk of mortality.

Vitamins A, B, C, and D are important for skin health and are being explored for new uses, but more research is needed to confirm their effectiveness.

Healthy scalp leads to better hair quality and less damage.

Heavy metals in personal care products can cause serious health issues like cancer and hair loss.