howtosupplement
Deficiency/Cognition/Mood

Multivitamin

Broad vitamin-mineral formula that covers dietary gaps and may modestly support cognition and mood in adults with inconsistent diets.

Multivitamin

Multivitamin

58
score
B
evidence
Caution
risk

Proven Benefits

01Covers micronutrient gaps
02Improves cognition in adults 60+
03Reduces perceived stress
04May reduce mental fatigue
05May lower homocysteine

Chemical Forms

Recommended
  • Vitamin D3
  • Folate (folic acid or L-5-MTHF)
  • Vitamin B12 (methylcobalamin or cyanocobalamin)
  • Zinc picolinate or citrate
  • Magnesium citrate or glycinate
Avoid
  • High-dose preformed vitamin A (retinol/retinyl palmitate)
  • Magnesium oxide (poor absorption)
  • Iron in general-use formulas unless you need it
  • High-dose beta-carotene for smokers
Expert Note

The best multivitamins use well-studied vitamin forms and mineral salts with better absorption and fewer GI side effects. Oxide minerals are cheap but less bioavailable, while unnecessary iron or high preformed vitamin A raises risk without helping most healthy adults. Formula quality matters more than the word multivitamin itself.

Protocol

Amount
1 serving
Frequency
Once daily
When
With breakfast or lunch and food containing some fat; avoid taking iron-containing formulas with coffee or tea.

Condition-Based Dosing

Adults 50+
1 serving daily of an age-specific formula with higher B12 and little or no iron unless prescribed.
Menstruating adults with low iron intake
1 serving daily of an iron-containing formula only if diet is low in iron or labs suggest need.
Smokers
1 serving daily of a formula without high-dose beta-carotene.

Safety & Limits

Upper Safe Limit
Practical ceiling: stay at label dose and below adult ULs for included nutrients, especially vitamin A 3000 mcg RAE, folic acid 1000 mcg, zinc 40 mg, and selenium 400 mcg/day (IOM/NIH).
Cycling
Safe for continuous use

Contraindications

Warfarin or other vitamin K-sensitive anticoagulants — vitamin K can change INR control
Pregnancy or trying to conceive — avoid high-retinol formulas; use a prenatal instead
Hemochromatosis or high ferritin — avoid iron-containing products
Chronic kidney disease — minerals and fat-soluble vitamins may accumulate
Thyroid disease — iodine-containing formulas may complicate management
Smokers — avoid formulas with high-dose beta-carotene
Retinoid drugs like isotretinoin or acitretin — additive vitamin A toxicity risk

Synergies

Omega-3

Most multivitamins provide little or no EPA/DHA, so omega-3 complements common gaps left uncovered by a standard daily multi.

Magnesium

Many multivitamins underdose magnesium because of pill bulk, so a separate magnesium can meaningfully close the gap.

Avoid Combining With

  • ✕Coffee or tea within 1 hour (can reduce iron absorption in formulas that contain iron)
  • ✕Calcium supplements taken together (can reduce iron and zinc absorption)
  • ✕High-fiber supplements taken at the same time (may modestly reduce mineral absorption)
  • ✕Alcohol excess (worsens B-vitamin and magnesium depletion)
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