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In-depth guideBlood tests and biomarkers.1,25-Dihydroxy Vitamin D (Calcitriol): Test & MeaningLearn what the 1,25-dihydroxy vitamin D blood test measures, when calcitriol testing is useful, and why 25-hydroxy vitamin D checks stores instead.Updated 24 Aug 202610 minute read

In-depth guideBlood tests and biomarkers.Ceruloplasmin Blood Test: What the Result Can MeanLearn what ceruloplasmin measures, why copper tests are paired with it, and why one low or high result cannot diagnose a condition.Updated 27 Sept 20266 minute read

In-depth guideBlood tests and biomarkers.IgG Blood Test: Total Immunoglobulin G ExplainedLearn what a total IgG blood test measures, how it differs from a germ-specific IgG test, and why low or high results need the matching laboratory range.Updated 30 Sept 20266 minute read

In-depth guideBlood tests and biomarkers.Lactate Dehydrogenase (LDH) Blood TestLearn what an LDH blood test can and cannot show, why a damaged sample can raise the result, and how specimen type and laboratory intervals affect interpretation.Updated 10 Sept 20265 minute read

In-depth guideBlood tests and biomarkers.Potassium Blood Test: Low, High and What Results MeanLearn what a potassium blood test measures, how to read low or high results, and why the report range, unit, specimen, method and surrounding tests matter.Updated 4 Sept 202614 minute read

In-depth guideBlood tests and biomarkers.Transferrin Saturation: Formula, Low & High ResultsUnderstand the transferrin saturation formula, why ferritin and inflammation matter, common low and high patterns, sample variation, and sensible follow-up.Updated 28 Aug 202615 minute read

In-depth guideSupplementsChamomile: Sleep Evidence and SafetyCompare chamomile tea and extracts, newer sleep research and anxiety trials. Understand uncertain benefits, allergies, medicine interactions and pregnancy gaps.Updated 21 Sept 20265 minute read

In-depth guideSupplementsL-Theanine: Sleep, Focus, Dose Evidence & SafetySee what L-theanine trials show for sleep, attention and stress, why caffeine changes the evidence, studied doses, safety limits and product checks.Updated 29 Aug 202616 minute read

In-depth guideSupplementsMelatonin: Dose, Timing, Sleep, Jet Lag & Safety | LongevityMateEvidence-based melatonin guide covering dose and timing, insomnia, jet lag, delayed sleep phase, children, long-term safety, interactions and product quality.Updated 10 Aug 202639 minute read

In-depth guideSupplementsMilk Thistle (Silymarin): Evidence and SafetyUnderstand milk thistle’s liver claims, uncertain clinical benefits and product-quality concerns. See what newer reviews and placebo-controlled trials found.Updated 20 Sept 20265 minute read

In-depth guideSupplementsSelenium Supplements: Benefits, Dose, Food Sources and SafetyA careful selenium guide covering essential functions, food variability, studied doses, cancer and thyroid evidence, US and European upper limits, interactions and toxicity signs.Updated 4 Sept 202616 minute read

In-depth guideSupplementsSt John's Wort: Evidence, Product Differences and InteractionsReview St John’s wort depression evidence, extract differences, serious medicine interactions and safety limits without selecting a treatment or dose.Updated 29 Sept 20265 minute read

In-depth guideSupplementsValerian SupplementsReview valerian sleep evidence, including the difference between perceived and measured improvement, varied preparations and uncertain long-term safety.Updated 10 Sept 20265 minute read

In-depth guideSupplementsNiacin SupplementsCompare niacin forms, understand why better cholesterol numbers did not establish added cardiovascular benefit in statin trials, and review high-dose safety.Updated 9 Sept 20265 minute read

In-depth guideSupplementsZinc supplements: benefits, dosage, forms and copper safetyA practical zinc guide covering deficiency, colds, elemental dose, forms, copper depletion, interactions, blood tests and who should avoid high doses.Updated 8 Aug 202624 minute read

In-depth guideBlood tests and biomarkers.Calprotectin Stool TestUnderstand stool calprotectin as an intestinal inflammation marker, with a named laboratory example, sample guidance and clear limits on diagnosing IBD.Updated 13 Sept 20265 minute read

In-depth guideBlood tests and biomarkers.Immunoglobulin A (IgA) Blood Test: Total IgA ExplainedUnderstand total IgA, high and low results, age-specific laboratory ranges, mg/dL versus g/L, and why total IgA differs from celiac antibodies.Updated 29 Sept 20265 minute read

In-depth guideSupplementsCocoa Flavanols: What the Heart Trials Actually FoundA clear look at cocoa flavanol trial findings, modest blood-pressure changes, product differences and why the evidence does not prove cardiovascular prevention.Updated 24 Sept 20268 minute read

In-depth guideSupplementsCollagen Peptides: Skin, Joint and Protein EvidenceA balanced guide to collagen peptides, including conflicting skin evidence, knee osteoarthritis findings, muscle protein limits, product forms, quality checks and safety.Updated 6 Sept 202617 minute read

In-depth guideSupplementsTart Cherry Supplements: Recovery Evidence and LimitsA practical guide to Montmorency tart cherry juice, concentrate and powder, with exercise-recovery trial results, uncertainty, label checks and safety limits.Updated 26 Sept 20268 minute read

In-depth guideBlood tests and biomarkers.Anion Gap Blood Test: Formula, High & Low ResultsUnderstand the anion gap formula, why laboratory ranges differ, what high or low results can mean, and why electrolytes, albumin and symptoms matter.Updated 27 Aug 202613 minute read

In-depth guideBlood tests and biomarkers.Apolipoprotein A1 (ApoA1): Test & MeaningUnderstand ApoA1, how it differs from HDL cholesterol, why a low result needs context, and how ApoB and the full lipid profile complete interpretation.Updated 30 Aug 202615 minute read

In-depth guideBlood tests and biomarkers.BNP Blood Test: What BNP and NT-proBNP Can Tell YouUnderstand BNP and NT-proBNP results, why high or low values need context, and which report details matter. Evidence-led, without a diagnosis from one number.Updated 24 Sept 20267 minute read

In-depth guideBlood tests and biomarkers.C-Peptide Blood Test: Meaning, Units and ContextUnderstand what a C-peptide result says about your body's own insulin production, and why glucose, timing, kidney function, medicines and the assay matter.Updated 3 Sept 202616 minute read

Fresh from the library

Beta-Carotene: Food Sources, Supplements and Safety

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Quercetin Supplements: Human Evidence and Safety

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