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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.

Melatonin increases cashmere quality in goats but reduces their milk production and doesn't affect their offspring's hair growth.

Prolactin affects the production of different keratins in human hair, which could lead to new treatments for skin and hair disorders.

Some common medications can harm male fertility, but many effects can be reversed.

Gender affects hair and scalp characteristics, with differences in hormone responses, graying patterns, and trace metals.

Androgens like testosterone affect hair growth and oil production differently across body parts and individuals.

Prolactin may play a significant role in skin and hair health and could be a target for treating skin and hair disorders.

Melatonin implants and long daylight hours alter the timing of hormone release and hair growth in mouflon sheep.

Metformin lowers prolactin in women without PCOS but not in those with PCOS, where it reduces other hormones instead.

The study improved understanding of gene roles in cashmere goat hair growth, aiding future cashmere production.

The article concludes that better understanding gene regulation related to seasonal changes can offer insights into the mechanisms of seasonal timing in mammals.

The conclusion is that accurately identifying the cause of high androgen levels in women with PCOS is crucial and requires specific tests.

Melasma is a skin condition linked to female hormones, genetics, UV exposure, and certain medications, but not to pituitary, adrenal, or thyroid diseases.

Amenorrhea is relatively rare and initial testing should check FSH, TSH, and prolactin levels.

Ficus carica extract improved fertility in rats and may help with certain health conditions.

The RORα gene is active in different parts of cashmere goat hair follicles and may be influenced by melatonin, especially in December when hair growth changes.

Prolactin may influence skin glands and could be a target for treating acne and skin aging.

Changing light exposure boosts hormone levels and antioxidant activity, improving cashmere growth in goats.

Immunizing goats against melatonin can temporarily change their cashmere growth cycles and increase fleece production.

Women with PCOS have higher 5alpha-reductase activity, affecting steroid levels.

Polycystic Ovary Syndrome (PCOS) often leads to severe acne, and lifestyle changes and hormonal treatments can help manage it.

A vaccine may prevent benign prostatic hyperplasia (BPH).

Inhibiting prolactin reduces hair follicle activation in cashmere goats.

Blocking the prolactin receptor might help treat various diseases, but more research is needed.

Goat reproductive activity and coat growth are affected by light and temperature, with temperature altering prolactin levels and hair growth, but not melatonin or estrus onset.

Prolactin may be important for skin growth and immune function.

Human scalp hair follicles can be used to study how prolactin affects hair growth and cell death.

Melatonin implants can change the seasonal prolactin levels and hair growth in adult cashmere goats but not in juveniles, and don't delay spring moult for better fiber harvesting.

Prolactin contributes to hair loss by promoting hair follicle shrinkage and cell death.

Prolactin affects hair growth and skin conditions, and could be a target for new skin disease treatments.