Guilherme Renke

Background: Hair loss is a prevalent but underaddressed consequence of the menopausal transition, reflecting the simultaneous decline of estrogen, progesterone, and the protective estrogen:androgen ratio that governs scalp follicular biology. Methods: Following SANRA guidelines, a systematic literature search was conducted across PubMed/MEDLINE and EMBASE (January 2000–September 2026) using MeSH and free-text terms encompassing female pattern hair loss (FPHL), menopause, sex steroids, hormone replacement therapy (HRT), 5-alpha-reductase, and dihydrotestosterone (DHT), among others.[25] Key Findings: Estrogen loss shortens anagen duration and amplifies follicular DHT accumulation through three converging mechanisms. Progesterone withdrawal removes an underappreciated anti-androgenic buffer via competitive 5-alpha-reductase inhibition. Testosterone, though gradually declining with age, becomes relatively more androgenic as estrogenic modulation of its conversion is lost. For eligible women, systemic transdermal estradiol combined with a hair-favorable progestogen — micronized progesterone or drospirenone — provides the most comprehensive follicular protection. Topical scalp estradiol constitutes a distinct hair-directed local modality. A structured hormonal panel including the testosterone:DHT ratio guides antiandrogen selection and treatment monitoring; serum DHT measured by LC-MS/MS functions as a pharmacodynamic marker, not a standalone diagnostic test for female pattern hair loss. Conclusions: Integrating hormonal hair assessment into routine gynecological-endocrinological practice — with attention to progestogen androgenicity, route of estrogen delivery, and the role of hormone replacement therapy as an adjunctive rather than primary hair indication — can meaningfully reduce the undertreatment of this prevalent dimension of menopausal women's health.

Therapeutic peptides are short chains of amino acids used to treat metabolic and endocrine conditions such as obesity and type 2 diabetes. While several peptide drugs have undergone rigorous approval processes that evaluate both safety and efficacy, novel, unapproved compounds have emerged and are rapidly expanding into preventive medicine and performance enhancement. Our objective is to present the effects, clinical applications, safety profiles, and regulatory status of prominent peptides used to treat several conditions. We reviewed 106 articles, prioritizing systematic reviews, meta-analyses, and randomized controlled trials in the PubMed, ScienceDirect, and SciELO databases. Our results suggest that therapeutic peptides are a promising tool for treating type 2 diabetes and obesity, for skin rejuvenation, and as hormone analogs for specific diseases and conditions. Although these are strategic and innovative options that can improve health, performance, and longevity, further studies are needed before most new peptides can be used safely in humans.

Estrogen-dependent conditions, such as endometriosis, adenomyosis, lipedema, polycystic ovary syndrome, and breast cancer, are intimately involved with hormonal changes related to estrogen and their receptors. These conditions can be expressed mainly during hormonal changes such as pregnancy, puberty, and menopause. They are associated with alterations in estrogen function and inflammatory mechanisms, leading to significant discomfort and a marked decrease in self-esteem in women. Resveratrol has been studied in the treatment of inflammatory diseases like obesity, metabolic syndrome, and endometriosis. The research suggests potential pathways through which resveratrol may also be beneficial in treating metabolic and estrogen-dependent conditions. We reviewed 63 articles from 2000 to 2025, prioritizing systematic reviews, meta-analyses, and randomized controlled trials in the PubMed, ScienceDirect, and SciELO databases. Our results suggest that resveratrol may benefit metabolic and estrogen-dependent conditions by modulating anti-inflammatory factors that regulate estrogen receptor activity, increasing lipolysis, decreasing insulin resistance, and mitigating oxidative stress. Future research should evaluate the long-term safety and potential therapeutic effects of resveratrol in metabolic conditions.

Body composition analysis focuses on measuring skeletal muscle mass and total body fat. The loss of muscle function and mass is related to clinical conditions such as frailty, increased risk of falls, and prolonged hospitalizations. Despite the relevance of the definition of sarcopenic obesity, there is still a gap in the monitoring of patients who have the combination of sarcopenia and myosteatosis, regardless of the presence of obesity. Therefore, we propose a new nomenclature, steatosarcopenia, a condition characterized by the loss of mass or skeletal muscle strength and performance associated with the excessive deposition of ectopic reserve fat in muscle tissue, in the same individual, not necessarily related to excess fat total body mass. A greater understanding of this condition may assist in developing strategies for preventing and treating metabolic diseases.

Gestrinone (R-2323), or ethylnorgestrienone, is a synthetic steroid of the 19-nortestosterone group more commonly used as an oral, intravaginal, or subcutaneous implant for the treatment of endometriosis, contraception, and estrogen-dependent conditions such as hypermenorrhea, premenstrual dysphoria, and intense menstrual cramps. This review aims to reevaluate the routes, doses, and applicability proposed for using gestrinone, including its use in new conditions such as menopause, lipedema, and sarcopenia. Here, we present the possible application of gestrinone as a long-acting therapeutic possibility through hormonal implants and the benefits and potential risks. Available evidence on the safety of doses and routes is limited. Gestrinone appears to be effective compared to other progestins and may have some advantages in the treatment of estrogen-dependent pathologies. Future research must evaluate gestrinone’s long-term safety and potential therapeutic indications.

Menopause marks the end of a woman’s reproductive life. It is well-known that skin aging is accelerated during this period, as declining estrogen detrimentally impacts the skin’s extracellular matrix (ECM) which is the provider of strength and elasticity. Menopause also affects scalp hair, reducing hair diameter and leading to shorter hair growth. Objective: To evaluate the main dermatological complaints of Brazilian women during this period, comparing the compatibility of these complaints with similar studies that evaluated skin health at menopause. Methods: This study interviewed 463 postmenopausal women between 42 and 83 years old through a public electronic questionnaire in the SurveyMonkey app about their perception of the changes noticed in their hair and skin after menopause. All statistical analyses were performed in R v. 3.6.1. Results with p-values < 0.05 were considered significant. Results: Dermatological health in menopausal women, especially the quality of the skin, nails and hair may deteriorate with estrogen deficits. As life expectancy increases and hormone replacement therapy (HRT) becomes more common, a greater understanding of their dermatological effects in menopause is needed. Conclusions: Menopause strongly impacts skin quality and worsens women’s self-esteem and quality of life. There is still a lack of knowledge about HRT and specific treatments for improving skin, hair and nails.

The consumption of coffee and caffeine (1,3,7-trimethylxanthine) is part of many cultures worldwide. Their properties include serving as a neurostimulant aid, enhancing energy substrate levels, and improving general exercise performance. Both present therapeutic effects that can also be used to control chronic and metabolic diseases due to four mechanisms: adenosine receptor antagonism, increased catecholamine concentrations, a phosphodiesterase inhibitor, and a stimulator of calcium-release channels. Despite the individual genetic variabilities, distinct mechanisms have been demonstrated to improve physical performance, thermogenesis, lipolysis, insulin sensitivity, and hormonal modulation. Thus, coffee consumption and caffeine supplementation may enhance physical and mental performance and may improve metabolic variables, reducing oxidative stress, inflammation, and insulin resistance. Current data reveal vital aspects of coffee and caffeine consumption in specific populations, although further studies are needed to define clinical interventions with caffeine in obesity and chronic conditions.

Segesterone acetate (SA) or Nestorone, a fourth-generation progestogen, is a synthetic compound with high progestational activity and no androgenic, glucocorticoid, or anabolic effects. However, due to its oral inactivity, SA must be used by other routes, such as subcutaneous. Thus, considering its peculiar properties, the SA subdermal implant is successfully used in female contraception and postmenopausal hormone replacement therapy (HRT). In recent years, its potential uses in endometriosis, polycystic ovaries syndrome (PCOS), and a new therapeutic possibility for neuroprotection have made this treatment extremely interesting. However, the absence of a standardized dose and the long-term safety of SA implant therapy in women is still controversial. Here, we present the possible indications, doses, limitations, and side effects of SA implant therapy.

Recent evidence shows the cardiometabolic effects of estrogen administration in postmenopausal women. Women have a cardiometabolic advantage during their reproductive years, which is lost at menopause due to declining estradiol (E2). E2, also known as 17-beta-estradiol, has diverse effects in its target tissues, including the cardiovascular (CV) system, through genomic and non-genomic signaling. Metabolic changes characteristic of menopause include a worsening lipid profile, changes in body fat distribution, epicardial and pericardial fat deposition, increased susceptibility to weight gain, and increased blood pressure, resulting in an increased risk of accelerated cardiovascular disease (CVD) development. E2 mediates its cardioprotective actions by increasing mitochondrial biogenesis, angiogenesis, and vasodilation, decreasing reactive oxygen species (ROS) and oxidative stress, and modulating the renin-angiotensin-aldosterone system (RAAS). In this review, we assess whether it is prudent to develop an approach to managing postmenopausal women based on modifying the patient's CV risk that includes human-identical hormone replacement therapy (HRT), modulation of RAAS, and stimulating mitochondrial biogenesis. Further research is needed to assess the safety and benefit of HRT to reduce cardiometabolic risk.

Introduction: In the scenario of metal toxicity, aluminum (Al) stands out as a ubiquitous type of metal that can be combined with other elements and form different compounds. Al is widely used daily as an adjuvant in vaccines, antacids, food additives (as components of AI-containing food additives), skin care products, cosmetics, and kitchenware, and can be an element or contaminant present in our daily life. Objective: To present a review of the main deleterious effects of Al on human health. Methods: The search was carried out from September 2022 to February 2023 in the Scopus, PubMed, Science Direct, Scielo, and Google Scholar databases, using scientific articles from 2012 to 2023. The quality of the studies was based on the GRADE instrument, and the risk of bias was analyzed according to the Cochrane instrument. Results and Conclusions: A total of 115 files were search returned. Further, 95 articles were evaluated, and 44 were included in this review. Based on the results, measuring Al’s relevance to health is essential in medicine. Several studies have demonstrated clinical outcomes and metabolic alterations with Al exposure. The tolerable weekly intake established by the European Food Safety Authority (EFSA) of 1 mg Al/kg body weight can be achieved through dietary exposure alone. Proven neurotoxicity in humans is the critical adverse effect of Al. A carcinogenic effect of Al has not been proven so far. Preventive medicine advocates that exposure to Al should be kept as low as possible. Chelating agents, such as calcium disodium ethylene diamine tetraacetic acid and deferoxamine, are options for acute poisoning, and monomethysilanetriol supplementation may be a long-term strategy with chelation potential. Further studies are needed to assess the impacts of Al on human health.