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Using testosterone-stimulated weanling rats can effectively replace castrated rats for anti-androgen testing, reducing animal stress.

Dihydrotestosterone changes some hormone-related gene expressions in rat pituitary glands but doesn't affect the estrous cycle.

Mutations in the enzyme don't significantly change how it binds to its specific substances.

Placenta polypeptide injection is a safe and effective treatment for sensitive skin.

A new peptide, murikal/SPR4, was found to significantly increase hair growth in mice, and its liposomal topical formulations enhanced hair growth more than commercial products. However, results on human scalp skin were unclear, needing more tests.

New treatments for hair loss focus on targeting specific causes to improve effectiveness and safety.

Topical diphencyprone helped regrow hair in mice and rats with a condition similar to human hair loss.

Polydeoxyribonucleotide (PDRN) may help lighten skin and treat hyperpigmentation.

AP collagen peptides help hair grow and improve hair health.

PDRN from trout sperm helps skin and hair regeneration but is costly and complex to produce.