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Hormones, nutrition, and seasonal changes regulate hair growth cycles, with androgens extending growth phases and factors like aging and malnutrition affecting hair loss and thinning.

Facial hair restoration is generally successful and satisfying for patients when done with quality techniques and realistic expectations.

Isotretinoin effectively reduces acne but causes dry skin, higher skin pH, more redness, and hair loss.

Apple extract called procyanidin B-2 was found to greatly increase hair growth.

Hair problems are common and distressing for women, but increasing knowledge of treatments offers hope.

Prolactin may affect hair growth differently based on gender and scalp area.

Kids with early graying hair often have low levels of calcium, ferritin, and vitamin D3.

Finasteride significantly improves hair growth but may cause sexual side effects.

Growth factors and microneedle therapy increase hair density in women with hair loss.

Dieckol from Ecklonia cava may help hair growth and could be a potential hair loss treatment.

Hair extensions can cause hair loss and scalp damage, and these problems might be more common than people realize.

ALA-PDT is effective and safe for chronic X-ray dermatitis, providing complete or partial remission.

The conclusion is that small hair follicles cause baldness in macaques, and treatments like antiandrogens and minoxidil can prevent hair loss and promote regrowth.

Adrenalectomy boosts hair growth and melanin in black rats, even with vitamin B¹ deficiency.

Human hair follicle dermal cells can effectively replace other cells in engineered skin.

ROOT HAIR SPECIFIC 10 (RHS10) reduces the length of root hairs in Arabidopsis plants.

A long-acting Vitamin C derivative helps hair grow by stimulating cells and increasing growth factors.

Mouse amnion can turn into skin and hair follicles with help from certain cells and factors.

Melatonin helps Cashmere goats grow more hair by affecting certain genes and cell pathways.

Hormone therapy affects hair growth in transgender individuals, with testosterone potentially causing hair loss in trans men and estrogen reducing facial/body hair in trans women; treatment options vary.

New hair transplant methods offer more natural results and better graft survival, with ongoing research to increase donor hair options.

Children with marasmus have more resting hair follicles and thinner, less pigmented hair, showing long-term malnutrition.

Some new oral anticoagulants may also cause hair loss and might not be better than traditional ones for preventing hair loss.

The ARTAS robotic system for hair restoration is efficient with fewer cuts than manual methods, but it's limited to certain hair types and can still leave scars.

Laser hair reduction near the eyebrows can cause serious eye injuries even with safety measures.

Minoxidil helps stabilize hair loss, increase density, and reduce shedding after hair transplant surgery.

Nd:YAG laser can reduce hair with multiple treatments, but permanent removal isn't guaranteed.

PI3K/Akt pathway is crucial for hair growth and regeneration.

The article concludes that developing in vitro models for human hair structures is important for research and reducing animal testing, but there are challenges like obtaining suitable samples and the models' limitations.

Hair follicles are valuable for regenerative medicine and wound healing.