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Testosterone treatment for older men can have short-term benefits, but long-term risks are unclear, requiring careful evaluation and monitoring.

Men with low testosterone should be carefully evaluated and monitored before and during treatment.

Surface-modified nanoparticles mainly use non-follicular pathways to enhance skin permeation of ibuprofen and could improve treatment for inflammatory skin diseases.

Hair treatments like bleaching increase friction by exposing tiny pores on the hair surface.

Finasteride may cause suicidal thoughts and mental side effects, especially in young people with hair loss.

AR/EDA2R gene linked to early-onset female hair loss, but 20p11 gene not involved.

Oxidative stress may play a role in causing alopecia areata.

The document concludes that sexual and psychiatric side effects from 5-alpha-reductase inhibitors are reported, but more high-quality research is needed to understand how often they occur.

The conclusion is that measuring how drugs partition into artificial sebum is important for predicting their delivery into hair and sebaceous follicles, and it provides better information than traditional methods.

Rosemary extract may boost the immune system, but more research on humans is needed to confirm this.

Apple-derived procyanidin B-2 can safely promote hair growth in men.

Apple procyanidin applied to the scalp may help grow hair without side effects.

Six new hair loss factors in men not linked to female hair loss.

Bleaching hair causes significant damage by breaking down proteins and fatty acids.

Nano-sized lipid particles increase dexamethasone's skin penetration and create a reservoir in the skin layers.

No link found between new male baldness genes and female hair loss.

Certain molecules in hair change with age and could be used for cosmetic treatments.

Aging makes hair thinner and rougher, with less clear edges.

Hair from people with seborrheic dermatitis is thicker scaled, more damaged, and thinner than healthy hair, and atomic force microscopy can help monitor the condition.

Finasteride crystals are held together by hydrogen bonds and weak interactions, forming synthon pseudopolymorphs.

Caffeine penetrates skin quickly through open hair follicles, but less through closed ones, with levels becoming equal after 22 hours.

RNA from horse hair follicles can track circadian rhythms non-invasively.

No link found between aromatase gene and female hair loss.

Some oils can penetrate hair and reduce the stickiness between fibers, but mineral oil cannot.

Hydrolyzed wheat proteins penetrate all hair types effectively.

Malassezia yeast linked to hair loss; ketoconazole helps treat it.

Repeated use of platelet-rich plasma in rats caused increased pain sensitivity.

Certain amino acid analogues can inhibit wool and hair growth and affect fiber strength.

The conclusion is that a new method can identify cosmetic residues on hair and match them to their products.

Repeated dyeing and shampooing cause hair color loss and damage.