Vitamin D Absorbance Study - Clinical Trial of the Absorbance of Nano Liquid D3

Inclusion Criteria: * Adults, ages 18-70 years old * Either male or female * Taking less than 2,000 IU of vitamin D daily as a supplement during the 30 days before starting the study * Ability to swallow a pill of typical size or a liquid less than 1 mL daily for 30 days * Ability to speak, read, and understand English * Access to smart phone or smart device with internet access for study-related communications * Ability to do 3 at-home vitamin D finger prick blood tests on 3 separate days. The kits and supplies will be given to you. * Ability to drop off finished blood tests at a UPS store or UPS drop box, or schedule a UPS pickup at your home, on each of the same days as you do the blood tests Exclusion Criteria: * Females who are pregnant * Taking, on average, more than 2,000 IU of vitamin D daily within 30 days before the study * Currently have COVID-19 infection * History of COVID-19 infection or positive COVID-19 test in last 60 days * People with a diagnosis of Cystic Fibrosis * People with a diagnosis of Crohn's Disease * People diagnosed with Celiac Disease * People with known diagnosis or history of any kidney related disease Including, but not limited to: Chronic kidney disease; End stage renal disease; Polycystic kidney disease; Lupus nephritis; Kidney cancer, Alport syndrome; Amyloidosis; Goodpasture syndrome; and Wegener's granulomatosis * People with known diagnosis or history of any liver related disease Including, but not limited to: Hepatitis A; Hepatitis B; Hepatitis C; Fatty liver disease; Cirrhosis of the liver; Liver cancer; Hemochromatosis; Wilson disease