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

Hair follicles help absorb and store topical compounds, aiding targeted drug delivery.

Iron deficiency may be related to hair loss, but there's not enough evidence to recommend iron screening or supplements for all hair loss patients.

Lecithin organogels could be good for applying drugs to the skin because they are stable, safe, and can improve drug absorption.

The document concludes that developing generic topical drugs requires ensuring they match the original in quality, composition, and structure, and often involves complex testing and regulatory steps.

The PDGF/PDGFR pathway is a potential drug target with mixed success in treating various diseases, including some cancers and fibrosis.

Fibrinogen/LDL apheresis may improve speech perception in sudden hearing loss, especially for those with high fibrinogen and LDL levels.

Erectile dysfunction is increasingly common in men under 40, with many physical and psychological causes, and various treatment options available.

Fibromodulin might help reduce scarring if increased in adult wounds like in fetal skin that heals without scars.

The new "differential stripping" method effectively measures how much substance gets into hair follicles.

Certain inhibitors slow down plant growth by causing early cell specialization without changing the cell development pattern.

Some skin medications are safe during pregnancy and breastfeeding, but others can harm the baby and should be avoided.

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

Accurate diagnosis and effective oral treatment are key to managing tinea capitis and preventing its spread.

TGF-β is crucial for controlling stem cell behavior and changes in its signaling can lead to diseases like cancer.

Methotrexate treats various disorders by inhibiting DNA synthesis, but careful monitoring is needed to avoid toxicity and manage side effects.

Male pattern baldness involves genetics, hormones, and needs better treatments.

Nanoparticles improve drug delivery through the skin but more research is needed on their long-term effects and skin penetration challenges.

The document concludes that adenosine receptor agonists have potential for treating various conditions, but only a few are approved due to challenges like side effects and the need for selective activation.

Dextran sulfate was found to be toxic and ineffective for treating HIV.

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

Liposomes improve drug delivery and reduce skin irritation in dermatology.

Eating less sugar, milk, and saturated fats and more vegetables and fish may help treat and prevent acne.

Exosomes could potentially enhance tissue repair and regeneration with lower rejection risk and easier production than live cell therapies.

The conclusion is that PCOS is caused by ovarian sensitivity to hormones and disrupted hormone control, possibly due to ovarian factors, and more research is needed.

Nanoparticles can improve skin drug delivery but have challenges like toxicity and stability that need more research.

PEVs improve minoxidil skin penetration, increasing hair growth.

Coal tar shampoos, salicylic acid, and topical corticosteroids are effective for scalp psoriasis, with Vitamin D3 analogues also showing benefits; severe cases may require stronger medication with more risks.

Hair analysis can detect cocaine use but doesn't accurately show the amount or timing of use.

Oxidative stress contributes to hair graying and loss as we age.