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Removing external lipids from hair reduces moisture and increases strength, while removing internal lipids decreases water permeability.

Genetic defects and UV radiation cause skin damage and aging.

Hair changes could indicate neurological diseases and help monitor treatment.

Natural products in cosmetics are beneficial for skin and hair care with low toxicity.

The skin has a complex immune system that is essential for protection and healing, requiring more research for better wound treatment.

Chitin and chitosan are useful in cosmetics for oral care, haircare, and skincare, including UV protection and strength improvement.

The skin is a complex barrier for drug penetration, but understanding its structure and interactions can improve drug delivery methods.

Tight junctions are key for skin protection and controlling what gets absorbed or passes through the skin.

Liposomal systems show promise for delivering drugs through the skin but face challenges like high costs and stability issues.

Pig skin is a good substitute for human skin to measure drug absorption, but differences in skin structure and enzymes across species must be considered.

Microneedles improve drug delivery in various body parts, are safe and painless, and show promise in cosmetology, vaccination, insulin delivery, and other medical applications.

The document recommends using both clinical evaluation and various measurement methods to assess skin greasiness, considering factors like temperature and hormones.

Fat-derived stem cells show promise for skin repair and reducing aging signs but need more research for consistent results.

PEVs improve minoxidil skin penetration, increasing hair growth.

Janus kinase inhibitors are promising treatments for autoimmune skin diseases like eczema and psoriasis.

Vitamin D has potential benefits for cancer prevention, heart health, diabetes, obesity, muscle function, skin health, and immune function, but clinical results are mixed and more research is needed.

Nutraceuticals may improve skin health and protect against aging, but more research is needed on their optimal use and possible health risks.

Ozone reacts more with unwashed hair, producing compounds due to scalp oils, which could lower ozone exposure but increase exposure to reaction products.

The document concludes that dandruff and seborrheic dermatitis are linked to inflammation and skin changes, and treating them with specific shampoos can reduce these issues.

Inherited ichthyoses cause widespread skin scaling and thickening due to gene mutations.

Minoxidil foam enters hair follicles and skin for hair growth.

Mushrooms have beneficial properties for skin and hair care products and have great potential for future cosmetic use.

Keratin proteins are crucial for healthy skin, but mutations can cause skin disorders with no effective treatments yet.

Plant cell culture is a promising method for creating sustainable and high-quality cosmetic ingredients.

Some plant-based treatments can help with benign prostatic hyperplasia symptoms, but more research is needed to confirm their safety and effectiveness.

Some birth control pills have a higher risk of blood clots than others.

Nanoparticles can enter the skin, potentially causing toxicity, especially in damaged skin.

Sebaceous glands in the skin play a key role in absorbing the antiandrogen drug RU 58841, especially when it's encapsulated in liposomes.

Ablative fractional resurfacing could improve how well topical drugs penetrate the skin, but more research is needed to fine-tune the method.

The document concludes that recognizing and properly diagnosing lipodystrophy syndromes is crucial for effective management and treatment.