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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.

Small changes in hormones can significantly impact health, showing the importance of sensitive testing for chemicals that disrupt hormones.

Fully regenerating human hair follicles not yet achieved.

Early hair loss may indicate prostate issues.

Hirsute women have lower type 2 17β-HSD enzyme levels, which improve with treatment.

Male rats grow hair faster than females, and certain hormones can slow or slightly increase hair growth, but not significantly beyond natural rates.

Where melanoma is on the body affects survival chances; melanomas on the back of the head are worse, while those on thighs and arms are less severe, and more sun exposure might improve survival.

The SAFE System for hair transplants results in low damage to follicles and could make the procedure suitable for more patients.

Ecklonia cava polyphenols help increase human hair growth and reduce hair loss.

NcoA4 may have roles beyond helping control gene activity, possibly affecting cell behavior and stability.

Genes linked to fibrosis are more active in people with central centrifugal cicatricial alopecia.

Both tissue expansion and serial excision are effective for scar revision in the head and neck area.

Protein hydrolysates applied to roots or leaves differently improved lettuce yield and quality, with the best results seen in specific combined treatments for each type.

Eclipta alba extract helps increase hair growth and decrease hair loss-related protein in mice.

Men with hair loss have more DNA changes in back-of-head hair follicles, possibly protecting them from thinning.

Mesenchymal stem cells, especially injected into the skin, heal wounds faster and better than chitosan gel or other treatments.

The nanoparticles improved hair growth and enlarged hair bulbs.

Recognizing and treating skin symptoms in essential thrombocythemia is crucial for patient quality of life.

Newer low-dose oral contraceptives with less androgenic effects improve patient compliance.

Managing PCOS is hard because it varies a lot, treatments are limited, and there's a lot of false information online.

High-intensity interval training improves certain hormone levels and lipid profiles in women with PCOS.

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.

Long-term use of dutasteride for enlarged prostate may worsen blood sugar, cholesterol, and erectile dysfunction.

Fat stem cell particles help regrow hair.

Poor maternal nutrition can lead to fewer wool follicles in Chinese Merino sheep.

5 alpha-reductase inhibitors can slightly improve symptoms of enlarged prostate but have a high risk of sexual side effects.

Different halogens on progesterone derivatives can either block or mimic male hormone effects, depending on their type and amount.

Male rats have more somatostatin neurons than females due to testosterone converting to estrogen during early development.

Non-ablative fractional laser treatments have a low risk of side effects in Asian patients.

Women with AGA have more androstenedione and dihydrotestosterone, less copper and zinc; copper imbalance affects AGA; treatment improves hormones and minerals.