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Human hair has more unsaturated fats inside than on the surface, and certain lipids may help bind the outer and inner layers together.

Pigmented casts are common in several hair loss conditions and can help diagnose specific types of alopecia.

Hair microscopy is useful for diagnosing certain hair loss conditions but has limitations and must be interpreted carefully.

Hair greying is linked to reduced ATM protein in hair cells, which protects against stress and damage.

Different tests are used to see how hair care products affect hair, and choosing the right test is important for accurate results.

The study found that hair fragility in Pili annulati may be caused by cavities and damage within the hair shafts.

White hair has less lipid content and absorbs water differently than brown hair.

mTORC1 signaling needed for quick hair follicle recovery after radiation damage.

The research found that postmortem root bands in hair are likely caused by the breakdown of a specific part of the hair's inner structure after death.

Direct excision techniques can rejuvenate the neck but may not enhance the jawline and could cause neck-face disharmony if done incorrectly.

Melanin density affects hair color, and this method can help in cosmetic assessments and diagnosing hair diseases.

Spaceflight can harm skin health by altering gene expression, affecting DNA, mitochondria, and skin barriers.

African hair has the most lipids, while Caucasian hair is more hydrated and stronger.

Recent hair loss research shows some progress, especially in understanding male pattern baldness, but effective treatments for many types of hair loss are still lacking.

Understanding how keratin structures in hair are arranged and interact is key for creating methods to extract and purify them.

Dermatologists should use hair relaxers carefully to avoid hair and scalp damage, following specific guidelines for application and maintenance.

Hair keratins are mainly on macrofibrils in the cortex and in the endocuticle in the cuticle.

Air pollution can damage hair and scalp, causing hair loss and inflammation.

Human hair shows promise for non-invasive medical testing, but more research is needed to standardize its use.

Twisting hair weakens it, but strength can be recovered at low twist levels.

Amino acids like arginine and cysteine protect hair during chemical treatments, keeping it strong and less brittle.

Chemical hair straighteners can severely damage hair and scalp with repeated use.

Iron deficiency anemia can cause itching, which often improves with iron supplements.

Argan, avocado, and coconut oils are absorbed into hair, improving hydration and protection.

Juglone from walnut extracts may help repair damaged hair.

Androgens and androgen receptors are important for metabolic health, affecting how the body uses glucose and fats through mitochondrial function.

Direct heat perms cause more damage to hair than softening heat perms.

Protein hair straighteners damage the hair more than hair dyes.

Hair fibers degrade and change color in very basic water.

Maternal aspartame consumption during pregnancy leads to skin damage and higher apoptosis in newborn rat offspring.