Melatonin has become a popular dietary supplement, most known as a chronobiotic, and for establishing healthy sleep. Research over the last decade into cancer, Alzheimer’s disease, multiple sclerosis, fertility, PCOS, and many other conditions, combined with the COVID-19 pandemic, has led to greater awareness of melatonin because of its ability to act as a potent antioxidant, immune-active agent, and mitochondrial regulator. There are distinct similarities between melatonin and vitamin D in the depth and breadth of their impact on health. Both act as hormones, affect multiple systems through their immune-modulating, anti-inflammatory functions, are found in the skin, and are responsive to sunlight and darkness. In fact, there may be similarities between the widespread concern about vitamin D deficiency as a “sunlight deficiency” and reduced melatonin secretion as a result of “darkness deficiency” from overexposure to artificial blue light. The trend toward greater use of melatonin supplements has resulted in concern about its safety, especially higher doses, long-term use, and application in certain populations (e.g., children). This review aims to evaluate the recent data on melatonin’s mechanisms, its clinical uses beyond sleep, safety concerns, and a thorough summary of therapeutic considerations concerning dietary supplementation, including the different formats available (animal, synthetic, and phytomelatonin), dosing, timing, contraindications, and nutrient combinations.

Resilience is commonly framed as a psychological trait, yet clinical and experimental evidence demonstrates that resilience failures emerge concurrently across metabolic, endocrine, immune, and cognitive domains. This review examines resilience as a bioenergetic property constrained by how organisms allocate finite metabolic resources under stress. We synthesize evidence from endocrinology, mitochondrial biology, immunometabolism, and stress physiology to propose a parsimonious, hypothesis-driven Energy Allocation System (EAS) in which the hypothalamic-pituitary-adrenal (HPA), thyroid (HPT), and gonadal (HPG) axes are conceptualized as a coordinated energy-governance network. Despite extensive investigation within these individual fields, the literature lacks an integrative physiological framework explaining why multisystem stress responses co-occur in predictable endocrine and metabolic patterns. Within this framework, mitochondrial reserve capacity serves as the limiting substrate through which hormonal signals regulate mobilization, metabolic pacing, immune tolerance, and recovery. The reviewed literature supports predictable patterns of endocrine reorganization during energetic strain, including prioritization of glucocorticoid-mediated mobilization, constrained thyroid hormone activation, suppression of long-term anabolic investment, and impaired recovery following stress. These configurations reflect adaptive energy-conserving strategies rather than isolated organ dysfunction. The novelty of this review lies in organizing established biological mechanisms into a unified, energy-allocation-based framework that generates falsifiable predictions linking endocrine coordination to bioenergetic capacity and recovery dynamics. We further discuss how routinely available biomarkers and validated psychometric measures can be interpreted as functional readouts of energetic allocation rather than static disease markers. Framing resilience through coordinated energy governance offers a unifying mechanistic lens for interpreting multisystem stress responses and generates testable predictions for future experimental and clinical investigation.

We would like to thank Dr. Pluta for his thoughtful comments

Low testosterone levels in men contribute to altered sexual health, including low libido, erectile dysfunction, impaired sleep, and changes in mood and energy. Nearly half of all infertility cases are implicated by male factors, such as low testosterone levels and altered semen and sperm health. The purpose of this case series is to share the experience of two men taking a concentrated, highly bioavailable gelatinized form of specific phenotypes (sometimes referred to as colors) of Lepidium peruvianum (Maca-OG™) to improve reproductive health. One man experienced an increase in total testosterone levels and fertility parameters, including sperm concentration, sperm motility, and total sperm count. The second experienced an increase in total testosterone levels, energy, mood, and sleep. This case series highlights a natural alternative for male health to support the body’s production of testosterone, especially when hormone therapy is not medically indicated or desired by the patient, or there are concerns about hormone therapy reducing the body’s production of testosterone.

Resilience is commonly framed as a psychological trait, yet clinical and experimental evidence demonstrates that resilience failures emerge concurrently across metabolic, endocrine, immune, and cognitive domains. This review examines resilience as a bio-energetic property constrained by how organisms allocate finite metabolic resources under stress. We synthesize evidence from endocrinology, mitochondrial biology, immunometabolism, and stress physiology to propose an integrated Energy Allocation System (EAS) in which the hypothalamic–pituitary–adrenal (HPA), thyroid (HPT), and gonadal (HPG) axes function as a coordinated energy-governance network. Within this framework, mitochondrial reserve capacity serves as the limiting substrate through which hormonal signals regulate mobilization, metabolic pacing, immune tolerance, and recovery. The reviewed literature supports predictable patterns of endocrine reorganization during energetic strain, including prioritization of glucocorticoid-mediated mobilization, constrained thyroid hormone activation, suppression of long-term anabolic investment, and impaired recovery following stress. These configurations reflect adaptive energy-conserving strategies rather than isolated organ dysfunction. We further discuss how routinely available biomarkers and validated psychometric measures can be interpreted as functional readouts of energetic allocation rather than static disease markers. Framing resilience through coordinated energy governance offers a unifying mechanistic lens for interpreting multisystem stress responses and generates testable predictions for future experimental and clinical investigation.

This review proposes that selected micronutrients may contribute to mitohormetic readiness, defined here as the pre-existing biochemical and regulatory capacity of a cell, tissue, or organism to sense, buffer, and transduce a bounded mitochondrial stressor, mount a proportionate adaptive response, and recover toward baseline, or a more capable post-challenge state, without persistent functional loss. This nutrient-centered construct extends the Energy Allocation System (EAS), in which resilience is shaped by how organisms allocate finite metabolic resources under stress and conservation-dominant phenotypes reflect coordinated energy-conserving responses rather than isolated dysfunction. The proposed relevance of micronutrients lies less in direct mitochondrial stimulation than in preserving the endocrine, redox, enzymatic, and one-carbon conditions required for beneficial adaptation. Thyroid physiology is used as the principal nutrient-centered exemplar, particularly through the roles of iodine, selenium, and iron, before the analysis is extended to methylfolate, cobalamin, riboflavin, magnesium, and niacin. The review does not present mitohormetic readiness as an established physiological principle or validated clinical construct, but as a hypothesis-generating extension of the EAS intended to refine how resilience, metabolic flexibility, and biochemical sufficiency are interpreted in clinical bioenergetics.