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Human skin can make serotonin and melatonin, which help protect and maintain it.

Metformin helps with menstrual cycles and insulin levels in PCOS but is less effective for hair growth, diabetes prevention, and weight loss, and may improve fertility and reduce diabetes risk.

Niosomes are a promising, stable, and cost-effective drug delivery system with potential for improved targeting and safety.

The conclusion is that proper signaling is crucial for hair growth and development, and errors can lead to cancer or hair loss.

Androgens can both increase and decrease hair growth in different parts of the body.

Dermatologists need to understand hair products to treat hair and scalp issues better.

Melatonin may benefit skin health and could be a promising treatment in dermatology.

Menopause can lead to skin and hair problems due to hormonal changes, but hormone replacement therapy might help slow these effects.

Epigenetic changes control how adult stem cells work and can lead to diseases like cancer if they go wrong.

Oestrogens are key for bone growth during puberty in both boys and girls.

Estrogens significantly influence hair growth by interacting with receptors in hair follicles and may help regulate the hair growth cycle.

Androgens can cause hair growth in some areas and hair loss on the scalp.

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.

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 niche environment controls stem cell behavior and plasticity, which is important for tissue health and repair.

Protoporphyrin IX is useful in cancer treatment but can cause health problems if not properly regulated.

Estrogen loss during menopause worsens skin health, but hormone replacement therapy may improve it, though more research is needed.

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.

Inflammation may be linked to hair loss, and targeting specific enzymes could help treat it.

Men generally have more severe COVID-19 cases and higher death rates than women due to biological differences.

The article concludes that the wool follicle is a valuable model for studying tissue interactions and has potential for genetic improvements in wool production.

Minoxidil and finasteride can slow hair loss and stimulate regrowth, but won't restore all lost hair or reverse complete baldness.

Liposomes could improve how skin care products work but are costly and not very stable.

New micelle solutions greatly improve skin delivery of certain antifungal drugs.

Preoperative pain assessment, regional anesthesia, and vitamin C can help prevent CRPS after surgery.

One minoxidil-sensitive potassium channel exists in human hair follicles.

Fullerenes show potential in skin care but need more safety research.

Androgens can both stimulate and cause hair loss, and understanding their effects is key to treating hair disorders.

Melanocytes are crucial for skin pigmentation and can affect conditions like melanoma, vitiligo, and albinism, as well as hair color and hearing.