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Melatonin levels urinary 6-sulfatoxymelatonin (overnight collection) is the standard research measure Cortisol rhythm morning and evening salivary cortisol to assess circadian regulation Inflammatory markers hsCRP, IL-6 as general aging biomarkers Fasting glucose and insulin epithalamin showed effects on glucose metabolism in aged primates (Khavinson et al., 2005) Subjective Tracking Energy journal daily 1-10 rating at consistent times Skin quality photos same lighting, same angle, monthly Recovery from exercise or minor illness note any changes in bounce-back time Mood and cognitive clarity brief daily notes Best Practices Documented tracking approaches establish all baselines before the first Epitalon cycle, with biomarkers tested at least 2 weeks before starting