Supplement Decision Tools

Free calculators and selectors for supplement decisions that are easy to overthink: price per useful dose, magnesium form fit, interaction cautions, protein value, creatine dose, and evidence grade.

Start here

Use these tools before comparing products. They do not replace medical advice, but they make the practical decision math visible before a label, ad, or Reddit thread pushes you too fast.

Tools

Price per effective dose calculatorCompare products by active amount and useful comparison dose, not bottle price alone.
Magnesium form selectorRoute magnesium glycinate, citrate, oxide, and gentler options by goal and tolerance.
Supplement interaction checklistFlag common medication, surgery, pregnancy, organ-health, and stacking cautions.
Protein powder cost per gram calculatorTurn protein or collagen labels into cost per serving, gram, and 25 g equivalent.
Creatine dose calculatorEstimate conservative maintenance and optional loading ranges without treating more as better.
Evidence grade glossaryTranslate meta-analysis, RCT, observational, animal/in-vitro, and brand-claim language.

How to use the tools safely

One tool is not a verdict.Use calculators to reveal tradeoffs, then read the supplement guide and product analysis.
Safety beats savings.A cheaper effective dose is not better if the form, dose, or interaction profile is wrong for you.
Evidence stays separate.Quality testing supports label trust; it does not prove a health outcome.

Canonical decision paths

Start with these core guides, product analyses, and methodology pages when comparing supplement decisions.

Vitamin D guideCanonical guide for vitamin D, D3/K2 choices, testing context, and safety cautions.
Omega-3 guideCanonical guide for EPA/DHA, fish oil vs algal oil, reflux issues, and quality checks.
Zinc guideCanonical guide for zinc dose, copper balance, long-term use, and interaction cautions.
L-theanine guideCanonical guide for calm/focus evidence, dose context, and stacking cautions.
Supplement Explained ScoreThe transparent scoring method used across product analyses.
Interaction checklistA practical checklist before combining supplements, medications, or high-dose products.
Price per effective dose calculatorCompare products by useful active amount instead of bottle price alone.
Supplement interaction checklist toolFlag common situations where supplement stacking should slow down.
Sources and methodologyHow sources, citations, uncertainty, and update signals are handled.
Upper limit glossaryUse this safety definition before treating a higher supplement dose as automatically better.
Heavy metals glossaryQuality and testing context for supplements where contamination questions matter.
Using Reddit advice carefullyA practical trust filter for community supplement anecdotes and product claims.
Brain fog and focusA goal page for sorting fatigue, focus, sleep, labs, and supplement-fit questions.
Hair growth supportA goal page that routes readers toward labs, deficiency context, and realistic expectations.
Culturelle Women's 4-in-1 ProtectionA product analysis that needs a clear comparison path from main hubs.
Solaray Vitamin D3 + K2A D3/K2 product analysis connected to the vitamin D decision path.
Vital Proteins Collagen capsulesA collagen analysis focused on capsule burden, effective dose, and value.
Garden of Life Once Daily WomenA probiotic product analysis connected to the strain and CFU decision path.
Life Extension B-ComplexA B-complex analysis focused on active forms, dose intensity, and fit.