Vitamin D Supplementation on Reported Rates of Taxane-Induced Neuropathy

Inclusion Criteria: * Diagnosis of stage I-III cancer of any type, OR diagnosis of stage IV cancer being treated with curative intent * Receiving or scheduled to begin taxane-based chemotherapy at Virginia Commonwealth University (VCU) Health Massey Comprehensive Cancer Center * Vitamin D serum level \<20 ng/mL Note: study participants with Vitamin D serum level ≥20 ng/mL may be enrolled in the observational arm. Exclusion Criteria: * Pre-existing diagnosis of neuropathy * Currently taking prescription Vitamin D (ergocalciferol) * Inability to converse in English * Pregnancy * Chronic kidney disease (stage IV or greater) * Known hyperparathyroidism * Hypercalcemia: Calcium levels \>10.5 mg/dL Note: study participants with calcium levels \<10.5 mg/dL may be enrolled in the observational arm.