Side by side

Compare supplements

Put up to three ingredients next to each other. See where the evidence, dosing, timing, and tradeoffs differ.

Supplement 1Supplement 2Supplement 3

Measure

Add a supplement

Evidence

Strong evidence

Common protocol1.8–2.3 mg/day adequate intake for adults——

Protocols mapped

1 goal-specific

—

Timing

With food

—

Expected effect

Days to months when intake or status is inadequate

—

Primary uses

Nutritional adequacyEnzyme functionDeficiency correction

Watch for

Neurologic toxicity with excessive chronic exposure

—