NutriFit Editorial
Editorial team of the NutriFit knowledge base
About the author
The editorial team produces reference materials on nutrition, laboratory markers and the daily work of a nutrition professional: the biomarker glossary, answers to common questions, breakdowns of calculation methods and tool reviews. The materials are written for the practice of nutritionists, health coaches and wellness specialists rather than as general weight-loss advice.
Qualification and limits of competence
A collective author. The editorial team does not provide medical services, does not diagnose and does not prescribe treatment. Every medical statement in the materials is backed by a PubMed publication, a WHO document or applicable clinical guidelines; a statement without a source is never published.
Area of responsibility
- Fact-checking against primary sources: PubMed, WHO, clinical guidelines
- Stating the publication date and the last review date of every material
- No promised outcomes, no superlatives and no figures without a cited source
- Correcting a material when evidence contradicting it appears
Verifiable profiles
Only confirmed profiles owned by NUTRIFIT LLC or by the author.
- NUTRIFIT LLChttps://nutrifit.company/en/about
Materials by this author
Published materials: 50
Taurine: Why the Heart and Bile Need It, Whether It Affects GABA Receptors, and Whether It Really Helps With Cramps
Evidence-based guide to taurine: aminosulfonic acid, myocardial SERCA2a calcium modulation, taurocholic bile acids, neuroprotection, and energy drink safety facts.
Betaine (TMG): Homocysteine, Methylation, Liver Health, and Exercise Performance
Evidence-based guide to betaine (trimethylglycine / TMG): BHMT enzyme, alternative homocysteine remethylation, fatty liver mitigation, cellular osmolyte, and athletic power.
L-Arginine in the Human Body: Nitric Oxide, Endothelium, Blood Pressure, Immunity, and the Limits of Supplementation
Evidence-based guide to L-arginine: eNOS substrate, nitric oxide vasodilation, wound healing collagen, first-pass arginase metabolism, herpes interactions, and safety.
L-Citrulline: Why It Raises Arginine More Effectively Than Arginine Itself, and What We Know About NO, Blood Flow, and Endurance
Evidence-based guide to L-citrulline: urea cycle, endothelial NO synthesis, bypass of first-pass hepatic arginase, citrulline malate, and vasodilation protocols.
Beta-Alanine in the Body: Carnosine, Muscle Buffering, Fatigue, and Athletic Performance
Evidence-based guide to beta-alanine: carnosine synthesis, intracellular proton buffering (H+), anaerobic exercise (1–4 min), sensory paresthesia, and loading strategies.
L-Carnitine: the Carnitine Shuttle, Heart, Brain, Fat Burning, and the TMAO Question
Evidence-based guide to L-carnitine: CPT-1 mitochondrial shuttle, myocardial bioenergetics, Acetyl-L-Carnitine (ALCAR) for brain function, TMAO risks, and dosing.
Glutamine in the Human Body: Enterocytes, the Intestinal Barrier, Immunity, Acid–Base Balance, and the Limits of Supplementation
Evidence-based guide to L-glutamine: primary enterocyte fuel, tight junction integrity (ZO-1, occludin), immune cell energetics under stress, and clinical dosing.
Coenzyme Q10: Mitochondria, Statins, Ubiquinol, and the Real Evidence Behind Supplements
Clinical review of CoQ10 (ubiquinone and ubiquinol): electron transport chain mechanics, myocardial bioenergetics, statin-associated muscle symptoms, and dosing.
Psyllium Husk in the Body: Soluble Fiber, LDL Reduction, Gut Motility, and Hydration
Evidence-based guide to psyllium: arabinoxylan polymer, bile acid sequestration, LDL-cholesterol lowering, glycemic blunting, and mandatory hydration safeguards.
Cocoa Flavanols in the Body: Epicatechin, Arterial Elasticity, Brain Perfusion, and EFSA Standards
Evidence-based guide to cocoa flavanols: monomeric (-)-epicatechin, flow-mediated dilation (FMD), EFSA-approved health claim (200 mg), cerebral blood flow, and Dutch processing pitfalls.
Garlic and Allicin in the Body: Organosulfur, Blood Pressure, H2S Signaling, and Safety
Evidence-based guide to garlic: alliin-alliinase enzymatic reaction, allicin generation, hydrogen sulfide (H2S) vasodilation, blood pressure trials, and surgical bleed risks.
Ginger in the Body: Gingerols, Shogaols, Nausea Relief, Joint Pain, and Safety
Evidence-based guide to ginger: 6-gingerol and 6-shogaol pharmacology, 5-HT3 serotonin receptor antagonism for nausea, dual COX/5-LOX inhibition, and gallstone precautions.
Curcumin: Anti-Inflammatory Potential, the Bioavailability Problem, and the Risks of Concentrated Supplements
Clinical guide to curcuminoids: NF-kB signaling inhibition, bioavailability challenges, piperine synergy, joint health, and safety contraindications.
Green Tea Extract (EGCG) in the Body: Catechins, Metabolism, Liver Toxicity, and Rules
Evidence-based guide to green tea extract: epigallocatechin-3-gallate (EGCG), COMT enzyme inhibition, EFSA hepatotoxicity warning (800 mg ceiling), and mandatory meal timing.
Caffeine in the Body: Adenosine Receptors, Alertness, Sleep Architecture, and CYP1A2 Genetics
Evidence-based guide to caffeine: competitive A1/A2A adenosine antagonism, hepatic CYP1A2 polymorphisms, slow-wave sleep suppression, tolerance, and the 400 mg safety boundary.
Fermented Foods in the Body: Microbiome Diversity, Bioactive Peptides, Histamine, and Safety
Evidence-based guide to fermented foods: the landmark Stanford trial (Cell 2021), systemic IL-6 reduction, vitamin K2 (MK-7) synthesis, biogenic amines (DAO deficiency), and home fermentation rules.
Dietary Polyphenols in the Body: Flavonoids, Xenohormesis, Nrf2 Pathway, and Gut Microbiome
Evidence-based guide to polyphenols: structural classes, xenohormesis paradigm, Nrf2/ARE endogenous antioxidant induction, colonic microbial biotransformation, and supplement safety.
Resistant Starch in the Body: Types RS1–RS4, Retrogradation, Butyrate, and Second-Meal Effect
Evidence-based metabolic guide to resistant starch: RS1–RS4 classification, retrogradation chemistry in cooled starches, Ruminococcus bromii fermentation, and the second-meal effect.
Glycemic Index and Glycemic Load: Glucose Variability, Satiety, and Meal Design
Evidence-based metabolic guide: Glycemic Index (GI) vs Glycemic Load (GL) calculation, reactive hypoglycemia crashes, meal composition modifiers, and endothelial glycation.
Sodium and Dietary Salt in the Body: Blood Pressure, Salt Sensitivity, and WHO Guidelines
Evidence-based medical analysis of sodium: vascular stiffness mechanics, endothelial nitric oxide suppression, genetic salt sensitivity (ENaC), hidden sodium, and DASH dietary balance.
Added Sugars in the Body: Fructose Metabolism, Ketohexokinase, Fatty Liver, and Health
Evidence-based metabolic guide: hepatic ketohexokinase kinetics, ATP depletion, uric acid generation, de novo lipogenesis (NAFLD/MASLD), and WHO thresholds.
Dietary Fats in the Body: Saturated, Omega-3 vs Omega-6, Eicosanoids, and Trans Fats
Evidence-based lipid guide: delta-6-desaturase enzymatic competition, pro-inflammatory arachidonic cascade, industrial trans fat vascular toxicity, and optimal lipid ratios.
Dietary Protein in the Body: Daily Needs, Muscle Synthesis, Kidney Safety, and Evidence
Evidence-based guide to dietary protein: muscle protein synthesis (MPS), leucine threshold, meal frequency, glomerular filtration effects, and safety limits.
Collagen in the Human Body: Biological Role, Evidence for Supplements, and Supporting Connective Tissue
Scientific analysis of collagen: Types I, II and III, hydrolyzed bioactive peptides, Pro-Hyp signaling, synergy with vitamin C, joint cartilage, and skin elasticity.
Creatine: How the Muscle Energy Buffer Works, What We Know About the Brain, Kidneys, and Supplementation
Clinical review of creatine monohydrate: ATP resynthesis, muscle power, cognitive benefits, the creatine vs creatinine distinction, and renal safety evidence.
Electrolytes and Hydration in the Body: Sodium, Potassium, Magnesium, and Clinical Safety
Evidence-based medical guide to fluid-electrolyte balance: Na+/K+-ATPase mechanics, plasma osmolality, fatal exercise-associated hyponatremia, and hyperkalemia risks in renal impairment.
Dietary Fiber and Prebiotics in the Body: Soluble vs Insoluble, SCFA Synthesis, and Safety
Evidence-based guide to dietary fiber: viscosity mechanics, microbial fermentation into butyrate and propionate, GLP-1 satiety signaling, LDL reduction, and vital hydration guidelines.
Probiotics in the Body: Strain Specificity, Microbiome, Gut Barrier, and Clinical Safety
Evidence-based medical guide to probiotics: CFU dosage thresholds, strain-specific therapeutic actions, tight junction integrity (ZO-1, occludin), antibiotic co-administration rules, and systemic bacteremia risks.
Omega-3 Fatty Acids: EPA and DHA, Heart Health, the Brain, Testing, and Choosing Supplements
Comprehensive guide to omega-3 fatty acids: ALA vs EPA/DHA, cardiovascular protection, triglyceride reduction, Omega-3 Index, and supplement forms.
Vitamin E in the Body: Tocopherols, Tocotrienols, Lipid Peroxidation, and Safety
Evidence-based guide to vitamin E: alpha-tocopherol kinetics, alpha-TPA transport, chain-breaking antioxidant mechanics, hemorrhagic stroke risks, and natural vs synthetic forms.
Vitamin D: Bones, Testing, Supplements, and the Risks of Megadoses
Evidence-based guide to vitamin D: cholecalciferol metabolism, calcium homeostasis, immune function, 25(OH)D blood testing, dosages, and toxicity risks.
Choline in the Body: Liver Protection, Acetylcholine, Brain Health, TMAO, and Safety
Evidence-based guide to choline: phosphatidylcholine, fatty liver prevention, cognitive neurotransmission, homocysteine remethylation, gut TMAO, and safe dosing.
Inositol (Vitamin B8) in the Body: Myo-Inositol, D-Chiro, Insulin, PCOS, and Safety
Clinical guide to inositol: IP3 second messengers, insulin sensitivity, polycystic ovary syndrome (PCOS), the physiological 40:1 ratio, and panic disorder protocols.
Vitamin B7 (Biotin) in the Body: Carboxylases, Hair & Nails, and Critical Lab Interference
Evidence-based guide to biotin: carboxylase enzymes, hair and nail myths, avidin binding from raw eggs, and dangerous immunoassay interference with troponin and thyroid tests.
Vitamin B5 in the Human Body: Coenzyme A, Energy Metabolism, Skin, the Nervous System, and the Limits of Supplementation
Evidence-based guide to vitamin B5: Coenzyme A (CoA) synthesis, steroid hormones, skin repair, pantethine for lipids, and exceptional safety profile.
Vitamin B3: NAD⁺, Nicotinic Acid, Nicotinamide, and Why a Better Lipid Panel Does Not Necessarily Mean Better Cardiovascular Protection
Comprehensive guide to vitamin B3: nicotinic acid vs nicotinamide, NAD+/NADH coenzymes, lipid management, niacin flush, liver safety, and dosing.
Vitamin B2: How Riboflavin Supports Cellular Energy, Why Deficiency Develops, and What It Has to Do With Migraine
Evidence-based guide to vitamin B2: FMN and FAD flavoproteins, mitochondrial respiratory chain, mucosal health, migraine prevention, and neon-yellow urine.
Vitamin B1 in the Human Body: Cellular Energy, the Nervous System, Hidden Deficiency, and the Limits of Supplementation
Evidence-based guide to vitamin B1: TPP coenzyme, carbohydrate metabolism, nervous system health, beriberi, Wernicke syndrome, benfotiamine bioavailability, and safe dosages.
Vitamin B6 in the Body: Neurotransmitters, Hemoglobin, Lab Tests, and Megadose Toxicity
Evidence-based guide to vitamin B6: pyridoxal-5-phosphate (PLP), GABA/serotonin synthesis, heme production, peripheral sensory neuropathy risks, and safe limits.
Vitamin C in the Body: Why It Is Needed, Whether It Helps With Colds, and Why Megadoses Can Be Risky
Практическое руководство по источникам витамина C, дозировкам, анализам и рискам добавок.
Vitamin K: Blood Clotting, Bones, Blood Vessels, and Drug Interactions
Практическое руководство по формам витамина K, питанию, анализам и лекарственной безопасности.
Vitamin A in the Body: Why It Is Needed, Where It Is Found, and Why Too Much Can Be Dangerous
A practical guide to retinol and carotenoids, food sources, deficiency clues, testing, pregnancy precautions and overdose risk.
Selenium in the Body: Why It Is Needed, Where It Comes From, and Why Excess Can Be Dangerous
Selenium: thyroid function, tests and safety — практическое руководство по источникам, дефициту, добавкам и рискам.
Iodine in the Body: Why It Matters, How to Recognize Deficiency, and Why Excess Can Be Dangerous
A practical guide to iodine in T4 and T3 synthesis, food sources, deficiency and excess, thyroid testing and safe supplement decisions.
Zinc in the Body: Why It Matters, How to Recognize Deficiency, and Why Excess Can Be Dangerous
A practical guide to zinc: its roles in immunity, skin and reproduction, causes of deficiency or excess, food sources, testing and interactions with copper and medicines.
Calcium in the Body: Why It Matters, How to Recognize Deficiency and Excess, and How to Choose Supplements Safely
A practical guide to calcium: its roles in bone and neuromuscular function, links with vitamin D and parathyroid hormone, food, testing and supplement safety.
Magnesium in the Body: Why It Matters, How to Recognize Deficiency, and How to Choose a Supplement Safely
A practical guide to magnesium: its roles in muscles and nerves, food sources, deficiency risks, testing and limits of self-directed supplements.
Iron and ferritin: deficiency, testing, food and safety
A practical guide to iron balance: the roles of haemoglobin and ferritin, causes of deficiency or overload, useful tests, diet and safe correction.
Folate (vitamin B9): functions, food, testing and pregnancy
A practical guide to folate: its role in cell division and blood formation, food folate versus folic acid, status assessment, neural-tube prevention and safe correction.
Vitamin B12: role, testing, food sources and safe correction
A practical guide to cobalamin: why it matters for nerves and blood formation, which tests help assess status, who needs monitoring, and how to avoid confusing deficiency with other causes of symptoms.
NutriFit is a software tool. We do not diagnose, prescribe treatment or provide medical services. Knowledge base materials are for reference only and do not replace a consultation with a physician.
Other authors
- Sergey StepanovFounder, sole member and Chief Executive Officer of NUTRIFIT LLC