This class explores the emerging science of methylation, epigenetics, and human biohacking, examining how lifestyle, nutrition, stress, sleep, and environmental exposures can influence biological processes and gene expression. Students will learn the fundamentals of DNA methylation and other epigenetic mechanisms and consider how these processes may connect genetics with everyday health and behavior. The course will also investigate environmental toxins, food additives, pesticides, contaminants, and other chemicals found in our food and surroundings, with an emphasis on understanding exposure, potential biological effects, and how to evaluate scientific evidence. Rather than promoting unproven interventions, the class encourages students to distinguish evidence-based approaches from speculation and marketing claims. Through case studies, scientific research, and practical discussions, students will develop a framework for making informed decisions about nutrition, environmental exposures, and responsible approaches to personal health optimization.