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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.

Spermidine helps protect against aging by preserving telomere length.

High energy boosts root hair growth in plants, while low energy stops it.

Mesenchymal stromal cells may help treat severe COVID-19, but more research is needed to confirm their effectiveness.

MED1 affects skin wound healing differently in young and old mice.

Finasteride causes lasting fertility decrease in rats.

Mice can regenerate ear tissue without the p53 protein.

Blocking TSLP reduces skin inflammation and cell overgrowth in psoriasis.

New treatments for hair loss may target specific pathways and generate new hair follicles.

Lupus panniculitis of the scalp causes linear hair loss and needs ongoing treatment to prevent recurrence and lupus.

Eating less can slow aging and help keep stem cells healthy by cleaning out damaged cell parts.

Less AgNOR protein production is linked to hair loss.

Adrenal gland disease is common in ferrets and causes hair loss and other symptoms.

Mechlorethamine treatment regrew hair in mice by killing immune cells causing hair loss without harming hair follicles.

Inflammation plays a key role in activating skin stem cells for hair growth and wound healing, but more research is needed to understand how it directs cell behavior.

The enzymes 5α-reductase and 3α/β-hydroxysteroid oxidoreductase help create brain-active substances from progesterone and testosterone, which could be used for treatment, but more research is needed to ensure their safety and effectiveness.

Hair follicle stem cells are promising for wound healing but require more research for safe clinical use.

Annurca apple extract promotes hair growth by changing hair follicle metabolism to boost keratin production.

Advancements in male reproductive medicine are ongoing, but more research and improved treatments are needed in several areas.

Melatonin-loaded nanocarriers improve melatonin delivery and effectiveness for various medical treatments.

Bioactive molecules show promise for improving skin repair and regeneration by overcoming current challenges with further research.

ADM scaffolds help skin heal by promoting a healing-type immune response.

A new plant extract from Avicennia marina could potentially be used to treat common hair loss.

An imbalance in gut bacteria is linked to skin immune diseases and may affect their outcomes and related health issues.

Selenium might help with insulin resistance and cholesterol in PCOS, but more research is needed to confirm its benefits.

The document concludes that pregnancy and cancer share immune evasion tactics, but more research is needed before using checkpoint blockade immunotherapy in pregnant cancer patients to avoid harm to the placenta.

Researchers developed a mouse model that tracks hair growth using bioluminescence, improving accuracy in studying hair cycles.

Young female Australian fur seals are losing hair due to low tyrosine and zinc levels and high pollution exposure.

Hair color is determined by different melanins and changes with age.

Androgens and SARMs play a role in body mass, frailty, skin health, and hair growth, and are used in treating prostate cancer, acne, and hair loss, with potential for new uses and improved versions in the future.