Everything DoseRank tracks on the niacinamide shelf — Ferrous Bisglycinate. The category itself is never ranked: 264 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 niacinamide 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.
FerritinMarker of iron stores.37 rankedStrong
HemoglobinBlood oxygen-carrying protein concentration.37 rankedStrong
Eye strainVisual fatigue or discomfort from eye use.17 rankedModerate-strong
C-reactive proteinAcute-phase inflammatory marker.41 rankedStrong
Wrinkle severityDegree of visible skin wrinkling.16 rankedStrong
Contrast sensitivityAbility to distinguish shades or low-contrast details.11 rankedStrong
Age-related macular degeneration progressionWorsening retinal degeneration affecting central vision.42 rankedStrong
Kidney stone riskLikelihood of nephrolithiasis formation or recurrence.80 rankedStrong
Muscle massQuantity of skeletal muscle tissue.67 rankedStrong
Potassium statusBody potassium balance.37 rankedStrong
Liver functionOverall biochemical or clinical hepatic performance.30 rankedStrong
MemoryAbility to encode, store, and retrieve information.51 rankedStrong
Lean body massNon-fat body mass, often used as a marker of preserved musculature.56 rankedStrong
ThermogenesisHeat production and metabolic energy expenditure.88 rankedStrong
ConstipationInfrequent, difficult, or hard bowel movements.98 rankedStrongNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best niacinamide supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 264 products against that goal's trials.