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Platelet-rich plasma might help with hair growth and skin conditions, but more research is needed to prove its effectiveness and safety.

Scientists turned mouse stem cells into skin cells that can grow into skin layers and structures.

Mice can regrow hair on wounds due to specific cell interactions and mechanical forces not seen in rats.

Chicken feather gene mutation helps understand human hair disorders.

Grafted rodent and human cells can regenerate hair follicles, but efficiency decreases with age.

Wnt10b overexpression can regenerate hair follicles, possibly helping treat hair loss and alopecia.

HFMs can help study hair growth and test potential hair growth drugs.

Flightless I protein affects hair growth, with low levels delaying it and high levels increasing hair length in rodents.

Scientists developed tools to observe hair regeneration in real time and assess skin health, using glowing mice and light-controlled genes.

Scientists can mimic hair disorders by altering genes in lab-grown human hair follicles, but these follicles lack some features of natural ones.

Flutamide may slightly improve hair loss in women, but finasteride does not work.

St. John's Wort can cause dangerous high blood pressure if taken with certain foods.

Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.

Human hair contains more glycosaminoglycans in children than adults, and these compounds decrease with age, possibly affecting hair thickness.

The document suggests using natural remedies like bloodletting and honey for various health issues but lacks scientific evidence for their effectiveness.

Ayurvedic treatments showed promise in treating premature graying of hair without harmful effects.

A rare ovarian tumor caused high testosterone and excess hair in a woman, which was resolved after tumor removal.

Premature graying of hair is linked to an imbalance of body energies in Ayurveda and treatment varies based on the specific imbalance.

Antiandrogens and androgen inhibitors like spironolactone, finasteride, and dutasteride can treat hair loss and skin conditions, but they have risks and side effects, including potential harm to pregnant women and risks of cancer and heart issues. Herbal remedies also have antiandrogenic effects but lack safety validation.

Planarian regeneration begins with a specific gene activation caused by injury, essential for healing and tissue regrowth.

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

Laminin-511 is crucial for early hair growth and maintaining important hair development signals.

Short-chain fatty acids from *Cutibacterium acnes* cause skin inflammation, contributing to acne.

The document suggests a possible link between Crohn's disease and Johne's disease and calls for more research.

Women with regular menstrual cycles and PCOS have linked kisspeptin and LH hormone patterns, unlike those with irregular cycles.

Thyroid function affects skin health, with a complex interaction between the two.

Dutasteride effectively treats enlarged prostate, reduces prostate cancer risk, and promotes hair regrowth with few side effects.

Cyproterone acetate is effective for treating hirsutism and acne but less so for hair loss, with side effects similar to birth control pills.

Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.

Intermittent low-dose finasteride works as well as daily use for treating excessive hair growth in women.