Vitamin D for Seniors: How Much to Take Over 65 and 70
The vitamin D3 dosage for seniors over 65 is 600 IU a day up to age 70 and 800 IU a day over 70. A daily 1,000 to 2,000 IU D3 supplement covers it for most seniors. Take it every day; very large once-a-year doses raised falls in older women.
By Erin Rose Updated October 20, 2026 How we score
What to buy
Most seniors: 2,000 IU a day
One softgel covers the 800 IU need with room to spare and stays well under the limit. NatureWise D3 2000 IU, our pick, is on NSF/ANSI 173.
NatureWise Vitamin D3 2000 IU in Olive Oil
$0.04 a day · 2,000 IU · NSF/ANSI 173
Want a smaller pill or a lower dose: 1,000 IU
1,000 IU still covers the 800 IU need. NatureWise D3 1000 IU is a small softgel, easier if large pills are hard to swallow. It is on NSF/ANSI 173, a list that checks the bottle holds what the label says.
NatureWise Vitamin D3 1000 IU in Olive Oil
$0.03 a day · 1,000 IU
Vitamin D dose chart for seniors
| Age | Daily need | Upper limit |
|---|---|---|
| 51 to 70 (includes 65) | 600 IU (15 mcg) | 4,000 IU (100 mcg) |
| 71 and older | 800 IU (20 mcg) | 4,000 IU (100 mcg) |
From age 75, the Endocrine Society suggests taking vitamin D even without a blood test, because trials found a small drop in deaths in that age group (Shah 2024).
Take it daily, not in big doses
One very large dose a year raised falls and fractures. Women 70 and older who took 500,000 IU once a year had more falls and more fractures than women on a placebo (Sanders 2010). The Endocrine Society advises a daily dose over large, spaced-out doses for people over 50 (Demay 2024).
What changes with age
Older skin makes less vitamin D from the same sun (NIH), and the daily need rises to 800 IU after 70. Still, older adults are less often low than younger ones: in the newest national blood data, 10% of adults 60 and older were below 50 nmol/L, against 31% of adults 18 to 39 (our analysis of the CDC’s national survey, 2021–2023).
Medicines to ask about
Ask your pharmacist before adding vitamin D if you take a thiazide water pill, a steroid like prednisone, orlistat, or a statin, or if you take warfarin and want a product with K2 (NIH).
Questions people ask
Should seniors take vitamin D with calcium?
For bones, the evidence favors the pair. Taken daily with calcium, vitamin D lowered fractures by 6% and hip fractures by 16% in trials; vitamin D alone did not (Yao 2019). Ask your doctor how much calcium you need, since food counts too.
Is 5,000 IU of vitamin D safe for seniors?
Only on a doctor’s advice. It is above the 4,000 IU daily upper limit. In a 3-year trial of adults 55 to 70, 4,000 and 10,000 IU a day lowered wrist bone density more than 400 IU (Burt 2019).
Sources
- NIH Office of Dietary Supplements, “Vitamin D: Fact Sheet for Health Professionals” (daily need, upper limit, age, medicines). ods.od.nih.gov
- Shah VP, et al. “A systematic review supporting the Endocrine Society clinical practice guidelines on vitamin D.” J Clin Endocrinol Metab. 2024. PubMed 38828942
- Demay MB, et al. “Vitamin D for the prevention of disease: an Endocrine Society clinical practice guideline.” J Clin Endocrinol Metab. 2024. PubMed 38828931
- Sanders KM, et al. “Annual high-dose oral vitamin D and falls and fractures in older women: a randomized controlled trial.” JAMA. 2010. PubMed 20460620
- Yao P, et al. “Vitamin D and calcium for the prevention of fracture: a systematic review and meta-analysis.” JAMA Netw Open. 2019. PubMed 31860103
- Burt LA, et al. “Effect of high-dose vitamin D supplementation on volumetric bone density and bone strength: a randomized clinical trial.” JAMA. 2019. PubMed 31454046
- CDC, National Health and Nutrition Examination Survey 2021–2023, serum 25-hydroxyvitamin D (our survey-weighted analysis of US adults).