concept · created 2026-08-26 · updated 2026-08-26 · nutrition, vitamin-d
Vitamin D insufficiency: 25‑hydroxyvitamin D 12–20 ng/mL; deficiency: <12 ng/mL. Treatment (2024 update): oral vitamin D3 25,000–50,000 IU weekly for 6–8 weeks, then 800–1,200 IU daily. Goal: maintain 20–40 ng/mL. Assess via 25‑hydroxyvitamin D measurement 3‑4 months after start. See hba1c-limitations for contexts where HbA1c may be unreliable.
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…id (1 mg), vitamin E (100 IU), alpha‑lipoic acid (600 mg), GABA supplement. See [[vitamin-d-management]] for vitamin D specifics.
…gression. In metformin users, assess renal function and avoid if eGFR < 30. See [[vitamin-d-management]] for bone‑kidney interactions.
Refer to ophthalmologist; consider fenofibrate per ADA. See [[vitamin-d-management]] for systemic eye health.