If you are going to supplement D3 over 5000iu, I would recommend getting a 25(OH)D blood test once or twice a year, ideally 2-3 months after each change in dose

If you are going to supplement D3 over 5000iu, I would recommend getting a 25(OH)D blood test once or twice a year, ideally 2-3 months after each change in dose. Then compare your levels to the levels here and adjust dosage accordingly: https://ods.od.nih.gov/factsheets/vitamind-healthprofessional/ https://ods.od.nih.gov/factsheets/vitamind-healthprofessiona... It may also be worth adjusting dosage between winter and summer months, depending on the amount of outdoor activity you do.