BACKGROUND: Investigating relationships between nutritional and clinical biochemistry biomarkers and skeletal muscle mass, strength and function (sarcopenic indices) may: (i) highlight micronutrients of interest for potential preventive or treatment strategies for sarcopenia, or (ii) highlight biomarkers that may be useful for identifying individuals at risk of sarcopenia. OBJECTIVES: Investigate associations between nutritional biomarkers (vitamin D, vitamin B12, folate, magnesium, potassium, calcium, iron), clinical biomarkers (haemoglobin, ferritin, albumin, creatinine, HbA1c) and sarcopenic indices (appendicular lean mass (ALM), height-adjusted ALM (ALM DESIGN: Using multivariable linear regression analysis we investigated cross-sectional associations between biomarkers and sarcopenic indices in data collected from 1,761 participants (age 22-103 years) from the Baltimore Longitudinal Study of Aging (BLSA). RESULTS: Haemoglobin was positively associated with ALM (β=0.20, p=0.021), HGS CONCLUSION: The associations found between measures of iron status and creatinine and sarcopenic indices, in men in particular, indicate potential importance for muscle health. Future longitudinal and intervention studies are warranted to confirm these findings.