Disclosed herein are wearable bands for biomarker tracking and methods for making the wearable bands. The biomarker tracking wearable band having a printed circuit board assembly (PCBA), the PCBA including an electrocardiography (ECG) sensor utilizing printed Silver-Silver Chloride (Ag-AgCl) electrodes and an optical photoplethysmography (PPG) sensor utilizing more than two light emitting diodes (LEDs), and a directly over molded band encasing the PCBA.