What vitamins and dietary supplements should a generally healthy man over 35 take?

Vitamin D Supplementation is Essential for Men Over 35

For generally healthy men over 35, the only supplement with strong evidence-based support is vitamin D at 600-800 IU (15-20 μg) daily, with consideration for increasing to 1000-2000 IU daily depending on individual risk factors. All other routine supplementation lacks compelling evidence for disease prevention in this age group.

Core Recommendation: Vitamin D Only

The most recent guidelines consistently support vitamin D supplementation as the single most important supplement for men in this age range 1. Daily vitamin D supplementation of 15 μg (600 IU) is recommended for men aged 35-70, increasing to 20 μg (800 IU) for those over 70 2. This recommendation is based on:

• Essential role in bone health and fracture prevention
• Strong association between low vitamin D status and frailty
• Potential mortality reduction in older adults (age 75+) 2
• Natural food sources (oily fish, eggs) are insufficient to meet requirements 1

For men at higher risk (limited sun exposure, darker skin, obesity, malabsorption conditions), consider 1000-2000 IU daily to achieve optimal serum 25(OH)D levels of 30 ng/mL 3.

What NOT to Take

The evidence strongly recommends AGAINST routine supplementation with:

• Beta carotene: Associated with increased lung cancer risk and all-cause mortality, particularly in smokers 4, 5
• Vitamin E: No net benefit for cardiovascular disease or cancer prevention 4, 5
• Multivitamins: Insufficient evidence of benefit for cardiovascular disease or cancer prevention in well-nourished adults under 50 2, 5

The 2024 Endocrine Society guideline explicitly states: "In the general adult population younger than age 50 years, we suggest against empiric vitamin D supplementation beyond the recommended Dietary Reference Intake" 2. This means no megadoses or additional supplements beyond basic vitamin D requirements.

Age-Specific Considerations

Men 35-49 Years

• Vitamin D: 600 IU (15 μg) daily
• No other routine supplementation recommended
• Focus on obtaining nutrients from a varied diet rich in fruits, vegetables, whole grains, and lean proteins 2

Men 50-74 Years

• Vitamin D: 600 IU (15 μg) daily (ages 50-70), then 800 IU (20 μg) daily (ages 70+)
• Calcium: 1000-1200 mg daily from dietary sources (3-4 servings of dairy products) 3, 6
• Calcium supplementation only if dietary intake is insufficient
• No routine 25(OH)D testing recommended unless specific risk factors present 2

Men 75+ Years

• Vitamin D: 800 IU (20 μg) daily minimum, potentially up to 2000 IU daily 2
• Calcium: 1200 mg daily 3
• Consider daily multivitamin only if dietary intake is poor 6

Special Circumstances Requiring Additional Supplementation

Vitamin B12: Only if you have:

• Chronic gastritis or use of proton pump inhibitors long-term
• Vegetarian/vegan diet
• Age >65 with documented deficiency 1, 6

Iron: Only if documented deficiency; routine supplementation not recommended for healthy men 1

Vitamin C: Only if dietary intake is poor (less than 5 servings fruits/vegetables daily) 1

Critical Pitfalls to Avoid

1. Megadosing: High-dose antioxidant supplements (vitamins A, C, E) have not demonstrated benefit and may cause harm 7, 4

2. Calcium excess: Single doses should not exceed 600 mg and must be separated from iron supplements by 2 hours 8

3. Assuming supplements replace diet: No supplement can substitute for a balanced diet rich in whole foods 7, 4

4. Ignoring medication interactions: Calcium interferes with iron absorption; vitamin K affects warfarin; discuss all supplements with your provider 4

5. Routine testing without indication: 25(OH)D testing is not recommended for screening in healthy adults aged 50-74 2

The Bottom Line Algorithm

For a healthy man over 35:

1. Take vitamin D 600-800 IU daily (the only supplement with strong evidence)
2. Ensure 1000-1200 mg calcium from diet (milk, yogurt, cheese, fortified foods)
3. Do NOT take: Beta carotene, vitamin E, or routine multivitamins
4. Consider additional supplementation ONLY if:
   • Documented deficiency on laboratory testing
   • Specific medical condition requiring supplementation
   • Poor dietary intake despite counseling

The evidence is clear: most supplements provide no benefit for disease prevention in well-nourished men, and some may cause harm 4, 5. The exception is vitamin D, which has consistent evidence supporting bone health and potentially reducing mortality in older adults 1, 3, 2.