According to Mayo Clinic, adults up to age 70 should aim for 600 IU of vitamin D daily, while adults older than 70 should aim for 800 IU.
Sources
- Aging: What to expect (mayoclinic.org)
- https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/ (ods.od.nih.gov)
- https://nutritionsource.hsph.harvard.edu/vitamin-d/ (nutritionsource.hsph.harvard.edu)
- https://www.health.harvard.edu/diet-and-nutrition/taking-too-much-vitamin-d-can-cloud-its-benefits-and-create-health-risks (health.harvard.edu)
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