However, based on this Randomized Controlled Trial here: https://pubmed.ncbi.nlm.nih.gov/22422304/
Conclusion: Treatment for 3 months with oral cholecalciferol 5,000 IU daily may be more effective than 2,000 IU daily in achieving optimal serum 25OHD concentrations in vitamin D-deficient patients.
Article:
Osteoporos Int. 2013 Mar;24(3):1101-5.
doi: 10.1007/s00198-012-1944-7. Epub 2012 Mar 16.
Effect of oral cholecalciferol 2,000 versus 5,000 IU on serum vitamin D, PTH, bone and muscle strength in patients with vitamin D deficiency
T Diamond 1 , Y K Wong, T Golombick
Affiliations
PMID: 22422304
DOI: 10.1007/s00198-012-1944-7
Been doing this and spreading the word since March, 2020. Vitamin D is lacking worldwide…dust bowl, food growing methods, etc lead to food with inadequate vitamins and minerals. I won't even cover 'processed foods'.