The toolbox
Gut & Metabolic Tools
Small, honest, source-backed tools that turn the research we cover into something you can use in a minute. No sign-up, nothing stored, and every number or pick traces back to a cited article.
Probiotics · by evidence
Probiotic Strain Finder
Pick a goal — blood sugar, weight, bloating, constipation, post-antibiotic, or general gut health — and see the specific strains with the best human evidence, each with an honest grade.
Find strains by goal
Nutrition · fiber math
Daily Fiber Target Calculator
Turn published guidance into one number: your daily fiber target (14 g per 1,000 kcal, or the IOM Adequate Intake by age and sex) and the grams you’d add to close the gap.
Calculate your target
Mechanism · fiber → SCFA
Fermentable Fiber → SCFA Estimator
Enter grams of specific fermentable fibers — inulin, GOS, resistant starch, pectin, beta-glucan, PHGG, psyllium — and get a relative SCFA / satiety tier, with an honest read on the fiber→SCFA→GLP-1/PYY pathway.
Estimate your SCFA potential
A note on what these are. Every tool here is educational and is not medical or nutrition advice. They apply population-level evidence and cannot account for your individual health, medications, or conditions. For anything that matters, talk to a licensed clinician or registered dietitian.