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Curly hair is mechanically different from straight hair and may need new testing methods.

Certain skin drugs and topical agents, including some natural extracts and fragrances, can cause allergic reactions. Some hair dyes and extensions, as well as minoxidil, a hair growth treatment, can also cause allergies. Botulinum toxin A can effectively reduce sweat but may have temporary side effects.

Testosterone supplements can increase muscle mass and strength in older men with low levels, but long-term effects and risks need more research.

Keratin proteins are crucial for hair structure and strength.

MK-0773 safely increased muscle mass but did not improve muscle strength or function in elderly women with sarcopenia.

New methods to classify curly hair types were developed based on shape and strength.

Thioglycolic acid and L-cysteine change hair structure differently during perms, affecting hair strength and curling efficiency.

Hair's structure and properties change with pH; acidic pH maintains strength and less swelling, while alkaline pH increases water content and swelling.

Mexican women's hair is between Asian and Caucasian hair in thickness and shape, with varied strength and some damage.

Testosterone replacement therapy improves libido, mood, muscle strength, and bone density in men with Testosterone Deficiency Syndrome.

Environmental, chemical, mechanical, and personal health factors can all damage hair and contribute to hair loss or changes in hair quality.

The skin's layers protect, sense, and regulate the body's internal balance, but can be prone to cancer.

Permanent waving weakens hair by altering its protein structure.

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

The new hair loss treatment kit was safe and improved hair growth without any adverse effects.

Different sizes of keratin peptides can strengthen hair, with smaller ones possibly increasing volume and larger ones repairing damage.

Resistance training might help with PCOS symptoms, but more research is needed.

K18® and Olaplex® both effectively repair bleached hair, improving its strength, smoothness, and overall health.

Hair camouflage methods like wigs and extensions can help Black women with alopecia feel better but may also damage hair if not used carefully.

HIF-1A may aid hair growth, Backhousia citriodora improves skin, autologous cells stabilize hair loss, infrared thermography assesses alopecia, and a new treatment preserves hair.

Hair care practices like using relaxers and tight braiding can lead to permanent hair loss in black women.

Tight hairstyles and chemical relaxers can cause hair loss known as traction alopecia.

Certain hairstyles and less hair oil use in African American girls can lead to scalp conditions like traction alopecia and seborrheic dermatitis.

Crossbreeding improves goat fiber quality, and specific genes affect hair traits and color.

Human hair's strength and flexibility vary by ethnicity, damage, and treatment.

Chitosan hydrogels are promising for repairing blood vessels but need improvements in strength and compatibility.

The document concludes that understanding consumer-brand relationships is key for marketing and that perceived quality helps national brands maintain higher prices than store brands.

Gene therapy shows promise for enhancing physical traits but faces ethical, safety, and regulatory challenges.

Adding human hair to clayey soil makes it stronger, even after freeze-thaw cycles, and is eco-friendly and cheap.

5-alpha reductase inhibitors may reduce bladder cancer recurrence and improve survival.