Everything DoseRank tracks on the bath, skin & hair shelf — Marine Collagen and Astaxanthin. The category itself is never ranked: 60 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 bath, skin & hair 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.
Wrinkle severityDegree of visible skin wrinkling.6 rankedStrong
TolerabilityOverall ability to continue the intervention without unacceptable side effects.4 rankedModerate-strong
Aspartate aminotransferase (AST)Enzyme used to assess liver and muscle injury.3 rankedStrong
Omega-3 indexRed blood cell EPA+DHA content reflecting omega-3 status.6 rankedStrong
Lean body massNon-fat body mass, often used as a marker of preserved musculature.16 rankedStrong
Resting heart rateBaseline heart rate measured at rest.6 rankedStrong
Sinus symptomsPressure, congestion, or pain related to sinus inflammation.3 rankedModerate-strong
Congenital anomalyStructural or functional birth defect.8 rankedStrong
Eye strainVisual fatigue or discomfort from eye use.4 rankedModerate-strong
Muscle massQuantity of skeletal muscle tissue.18 rankedStrong
ThermogenesisHeat production and metabolic energy expenditure.25 rankedStrong
Resting energy expenditureCalories burned at rest; marker of basal metabolism.25 rankedStrong
Alanine aminotransferase (ALT)Liver enzyme used to assess hepatocellular injury.8 rankedStrong
Sodium statusBody sodium balance.15 rankedStrong
Skin hydrationMoisture content or hydration of the skin.6 rankedStrongNothing is ranked yet — the shelf stays locked until you pick a goal.
No goal, no ranking.
A “best bath, skin & hair supplement” list without a goal would be marketing, not evidence. Pick what you want to improve and DoseRank scores all 60 products against that goal's trials.