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This study found that lower salmon availability was associated with higher stress hormone levels in grizzly and black bears, influencing their physiological responses and competitive behaviors.

This study found that older age at puberty may be associated with lower semen quality and altered reproductive hormone levels in young men, though only some results were statistically significant.

This study observed that higher PFAS concentrations during adolescence were linked to later pubertal development and lower estradiol levels in females, but not in males, potentially due to PFAS excretion with menstrual fluid.

This study found that men born with very low birth weight had higher median serum estradiol levels but similar reproductive patterns compared to men born at term.

This study found significant associations between polycystic ovary syndrome and increased serum levels of reproductive hormones, as well as connections to infertility, hirsutism, and metabolic syndrome in Yemeni women.

This narrative review emphasizes the significant improvements in mental well-being linked to gender-affirming treatments while highlighting the need for ongoing research into hormone therapy's long-term effects and its impact on transgender individuals' reproductive health.

This study reported that women with polycystic ovary syndrome had higher glypican-4 levels compared to controls, indicating its significant role in hormonal regulation associated with the condition.

In this study, combining Kuntai capsules with nilestriol tablets for three months was found to reduce symptoms of perimenopausal syndrome and improve reproductive hormone levels more effectively than nilestriol alone; however, the benefits did not persist significantly beyond three months.

This study found that premenopausal exercising women with oligomenorrhea had lower triiodothyronine levels and truncal fat percentage compared to other groups, suggesting distinct energetic and reproductive profiles.

This study found that hair cortisol levels in black-tailed prairie dogs, influenced by factors like predation risk and lactation, were associated with reproductive success, supporting the Cort-Adaptation hypothesis.

This study found that measuring reproductive hormone levels in brown bear hair may effectively support non-invasive genetic sampling, though larger samples or more sensitive techniques are needed for broader application.

This study found that finasteride treatment in males with androgenetic alopecia was linked to significant changes in sperm parameters and increased testosterone levels, but no sexual dysfunction was observed, and sperm parameters returned to baseline after treatment stopped.

This narrative review suggests a strong association between abrupt hormonal imbalances and frontal fibrosing alopecia in women, especially related to reduced fertile years and certain hormonal therapies.

Sex hormones affect reproduction, sexual development, and oral health, and it's important for dental practitioners to understand their effects and interactions.

This study found that steroid reproductive hormones such as estradiol and testosterone can be preserved and analyzed in archaeological human hair, providing new insights into ancient health and fertility.

This study observed that chemically-induced intersex frogs displayed altered brain mRNA profiles, with finasteride increasing certain hormone-related gene expressions and fadrozole reducing aromatase activity without affecting gene transcript levels.

This study found that steroid hormone levels in human hair correlate significantly with those in serum, suggesting hair may be a viable medium for assessing hormonal status.

This review outlines the significant roles of sex steroid hormones like estrogens, progestins, and testosterone in reproductive and overall health, and discusses how their imbalances are linked to various health conditions such as polycystic ovary syndrome and reproductive cancers.

This study found that elevated serum AMH levels can be a strong predictor for diagnosing PCOS among women of reproductive age, when used alongside the other Rotterdam criteria.

This study concluded that an elevated serum Anti-Müllerian Hormone level is a strong predictor for diagnosing Polycystic Ovarian Syndrome among women of reproductive age with characteristic features of the condition.

This review consolidates existing research showing that lower SHBG levels are significantly associated with adverse reproductive, metabolic, and cardiovascular outcomes, suggesting its importance as a marker in managing various health conditions.

This source discusses the complexity of cancer research, emphasizing that despite extensive studies, a comprehensive understanding of metastatic progression and therapeutic development remains elusive, and underscores the importance of animal models in breast cancer research.

This study found that metformin increased follicle-stimulating hormone levels and decreased kisspeptin concentrations in Iraqi women with polycystic ovary syndrome, with gene variations potentially influencing treatment response.

This study found that serum AMH and new ultrasonographic criteria, such as FNPO ≥15 and OV ≥ 6.5 mL, effectively diagnosed PCOS, with a recommended AMH threshold of 4.7 ng/mL.

This study found that women with polycystic ovary syndrome had significantly lower levels of estradiol and follicle stimulating hormone compared to fertile women, with no significant differences in testosterone and thyroid hormone levels.

In this cohort study of young Danish men, self-reported older age at voice break was linked to certain reproductive hormone changes that suggest reduced male fecundity, but associations with semen characteristics and testicular volume were not statistically significant.

In this study, the aqueous extract from Phthirusa pyrifolia leaves significantly decreased testosterone levels in male Wistar rats without causing liver or kidney damage, suggesting potential effects on libido and reproduction.

This study found that in captive mouflon rams, reproductive and physical maturation, marked by changes in hormone levels and physical attributes, progresses gradually across their life span, with sexual maturity tied closely to physical maturity.

This study found that wolves in heavily hunted areas of Canada's tundra–taiga exhibited higher levels of stress and reproductive hormones, indicating social instability and increased reproductive effort due to human-caused mortality.

This review assesses the current literature on COVID-19's effects on male sexual and reproductive health, highlighting significant research gaps and providing guidance for patient counseling.