Everything DoseRank tracks on the multivitamins shelf — Potassium Iodide and Kelp. The category itself is never ranked: 1.8k products get scored the moment you say what you want them to do.
How to read the scores
This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →
Answer a few questions about your goals, habits, stack, and budget. Then, DoseRank will find the products that best match your needs based on your answers. It's free and only takes 60 seconds! No account is required.
A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.
Questions
Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value — computed for the goal you picked, across this category's products. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.
Start with a goal, not a brand
Browsing multivitamins supplements without a goal makes no sense — different products do different jobs, and “best” flips depending on which job you're hiring for. These are the 45 health outcomes that matter for this category. Pick yours, and the full evidence-ranked shelf loads for that goal alone.
Iodine statusBiochemical sufficiency of iodine.1.2k rankedStrong
Vitamin A statusBiochemical sufficiency of retinoids or carotenoid-derived vitamin A.1.4k rankedStrong
Biotin statusBiochemical sufficiency of biotin.1.4k rankedStrong
PhotosensitivityAbnormal skin sensitivity to sunlight or light exposure.1.1k rankedModerate-strong
Riboflavin statusBiochemical sufficiency of vitamin B2.1.3k rankedStrong
Thyroid functionOverall function of the thyroid axis.1.4k rankedStrong
Folate statusBiochemical sufficiency of folate.1.5k rankedStrong
Niacin statusBiochemical sufficiency of vitamin B3.1.4k rankedStrong
Thyroid-stimulating hormonePituitary hormone used to assess thyroid status.1.4k rankedStrong
Thiamine statusBiochemical sufficiency of vitamin B1.1.3k rankedStrong
Selenium statusBiochemical sufficiency of selenium.1.1k rankedStrong
Cataract progressionWorsening of lens opacity over time.1.3k rankedModerate-strong
Vitamin B12 statusBiochemical sufficiency of cobalamin.1.5k rankedStrong
Nail strengthResistance of nails to splitting or breaking.1.2k rankedLimited
Vitamin B6 statusBiochemical sufficiency of pyridoxine-related compounds.1.5k rankedStrongNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best multivitamins supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 1.8k products against that goal's trials.