Deficiency/Cognition/Mood

Multivitamin

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

score

evidence

Caution

risk

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Use with caution

This supplement may interact with medications, medical conditions or sensitive populations. Review safety before use.

Overview

Forms

Safety

Stack

Quick Take

Reasonable nutrition insurance if your diet is inconsistent; if you already eat well, benefits are usually modest.

A multivitamin is a mixed formula of essential vitamins and minerals normally obtained from fruits, vegetables, legumes, grains, dairy, eggs, fish, and meat. It mainly works by filling small intake gaps that can limit enzyme activity, red blood cell production, and nerve signaling. Its clearest benefit is preventing or correcting marginal insufficiency; evidence also suggests modest support for cognition in older adults and for stress or fatigue in some healthy adults. It helps most when diet quality is inconsistent or intake is low.

Potential benefits

Covers micronutrient gaps

Improves cognition in adults 60+

Reduces perceived stress

May reduce mental fatigue

May lower homocysteine

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.

Onset Time

2-4 weeks for mood/energy, 8-12 weeks for nutrient markers

Who Should Consider

Adults with inconsistent diet quality

Adults 50+

People eating on low calories

Vegetarians with limited food variety

Frequent travelers or shift workers

How It Works

A multivitamin fills small nutrient gaps that can impair hundreds of enzyme reactions involved in energy production, red blood cell formation, neurotransmitter synthesis, and cellular repair. When intake is low, restoring adequate vitamin and mineral status normalizes these pathways rather than pushing them above normal.

Updated 5/19/2026