Vitamin D: 30 ng/mL

A vitamin D level of 30 ng/mL is considered low or inadequate. Low vitamin D may put you at increased risk for COVID-19, diabetes, and cancer, as well as certain autoimmune and neurodegenerative diseases (such as multiple sclerosis and Alzheimer’s).

The Relationship Between Vitamin D Serum Levels and Metabolic Syndrome in Patients Referred to Central Laboratory of ACECR in Mashhad, Iran, Jentashapir Journal of Cellular and Molecular Biology

Clinical characteristics and prevalence of vitamin D insufficiency in children less than two years of age. - Abstract - Europe PMC

Is 2,000 IU of vitamin D3 safe to take? - Quora

Vitamin D3 25-Hydroxyvitamin D: Reference Range, Interpretation, Collection and Panels

Comparison of vitamin D levels at baseline and 3 months and 1 year

Startling Findings About Vitamin D - page 1 - Life Extension

Efficacy and safety of vitamin D3 B.O.N intramuscular injection in Korean adults with vitamin D deficiency - ScienceDirect

Nutrients, Free Full-Text

Vitamin D in Our Food - GrassrootsHealth

Rheumatic Diseases often treated by Vitamin D, may need 40-60 ng – Oct 2021

Oral lichen planus among patients from Lublin Region in relation to 25-hydroxy-vitamin D3 serum level