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Collagen and Retinol: The Skin Duo That Works From Within
The skin is a collagen factory that needs raw material, assembly tools, and a regulator of renewal. This is the logic behind the oral collagen + retinol duo: the evidence for each active ingredient...
Oral Retinol vs. Retinol Cream: Which to Choose and Why
Retinol suffers from a unique problem: the same word designates two products that have neither the same objective, nor the same mechanism, nor the same precautions. The cream acts locally on skin a...
Retinol: Dangers, Pregnancy and Precautions to Know
Vitamin A is a nutritional paradox: essential for vision, skin, and immunity, it is also one of the rare vitamins that can be truly dangerous in excess. Precise thresholds, the study that establish...
Vitamin B5 (Pantothenic Acid): Benefits, Skin, Hair, Acne and Dosage (The Complete 2026 Guide)
Vitamin B5 (Pantothenic Acid, Panthenol): Roles, Foods, Deficiency, Effects on Skin and Hair, Acne, Pantethine and Cholesterol, Daily Dose. Complete Guide.
Vitamin B3 (Niacin, Niacinamide): Benefits, Skin, Risks and Dosage (The Complete 2026 Guide)
One vitamin, two molecules, two safety limits that differ by a factor of ninety. What niacinamide really does for skin, and why niacin left prescriptions behind.
Resveratrol: Benefits, Dosage, and What Science Really Says
A molecule from red wine and promise of longevity, resveratrol has a reputation that exceeds what science has established. What studies actually show, and how to choose it wisely.
Collagen Peptides: Why Tripeptides Change Everything
Collagen peptides, hydrolyzed collagen and molecular weight: what tripeptides at 300 Da really change for absorption.
Novagen®: Premium Marine Collagen in Patented Tripeptide Form
Novagen® by Nutrition•pro®: premium marine collagen with Naticol® x3Peptide, Europe's first patented marine tripeptide. Absorption, results, formula.
Collagen-Rich Foods: How to Boost Your Natural Production
N The Nutrition•pro team Based on scientific review and clinical meta-analysis (Nutrients, Int J Dermatol). Our methodology "Eating collagen-rich foods for beautiful skin": the idea appe...
Best Collagen: Which One to Choose Based on Your Goal (2026)
What is the best collagen in 2026? Marine type I for skin, type II for joints, tripeptides: how to choose based on your goal.
When to Take Collagen: Morning or Evening, on an Empty Stomach or With Meals?
The timing of collagen intake matters less than people say. What science shows about morning, evening, on an empty stomach, and sports
Retinol (Vitamin A): Proven Benefits for Skin, Vision and Immunity, Dosage and Precautions
Retinol is the active form of vitamin A. Benefits recognized by the EFSA, difference with a cream, dosage, safety limit and precautions.
How to Consume Collagen Powder? 5 Ways
N The Nutrition•pro teamPractical guide to using marine collagen powder. Our methodology You have your pot of collagen powder, but one question remains: how do you consume it daily witho...
Does Collagen Make You Gain Weight? Calories and Truth
Does collagen make you gain weight? No: pure protein, with no sugar or fat, negligible calories. And it doesn't make you lose weight either. The honest truth.
Marine Collagen: Dangers, Risks and Precautions
Is marine collagen dangerous? Side effects, fish allergies, quality, contraindications: the honest truth, without downplaying.
Collagen Mask: Myth or Reality? What Actually Works
Does a collagen mask plump the skin? It hydrates the surface but doesn't rebuild collagen. The real proven solution is to drink it.
Collagen: Powder, Drink or Capsules? The Comparison
Marine collagen powder, drink, or capsules: which format should you choose? Comparison of doses and uses to find the one that suits you.
Collagen for Hair and Nails: What Does Science Say?
Does collagen strengthen hair and nails? Nails: real proof (+12% growth). Hair: indirect support. The honest truth.
Collagen and Joints: Does It Really Work?
Does collagen relieve joints? Type I or type II, dosage, sport: what clinical studies show, without exaggeration.
Collagen and Skin: Wrinkles, Firmness, Real Effectiveness
What does collagen really change on the skin? Wrinkles, firmness, hydration: study results, in what order and how long it takes.
Études indépendantes
Ce que dit la science sur les compléments alimentaires, les régimes et le déficit calorique
Nous avons épluché la littérature scientifique pour apporter de vraies réponses sur ces sujets saturés de promesses. L'objectif est simple : offrir une vision objective, chiffrée et vérifiable, plutôt que des certitudes marketing.
- 01 Shilajit in France in 2026: Price, Transparency and Demand, the First Market StudyFirst French market study on shilajit: 1.8 million searches analyzed, price benchmark across 13 brands, and transparency audit of certificates of analysis. Data collected August 2026.
- 02 Semaglutide (Ozempic, Wegovy) vs Glucomannan (Konjac): A Scientific ComparisonRigorous comparison between semaglutide (Ozempic, Wegovy) and glucomannan (Konjac): efficacy, safety, cost, sustainability. Two tools for two audiences: medication for confirmed obesity, supplement to help maintain an ordinary caloric deficit.
- 03 Top 10 Dietary Supplements for Weight Loss: Summary of 18 Meta-AnalysesObjective ranking of 10 dietary supplements for weight loss based on 18 meta-analyses. Net effect vs placebo, GRADE evidence level, tolerance and overall score. Glucomannan, green tea and caffeine rank at the top.
- 04 How Much Does Each Diet Cost? Comparative Analysis of 14 Popular DietsEconomic analysis of 14 dietary regimens in France: weekly cost, annual cost increase, and cost per kilogram lost. Based on average prices from major retailers and cross-referenced with efficacy measured in scientific literature.
- 05 Meta-analysis of 14 Diets: Synthesis of 12 Major Meta-analysesComparative synthesis of 14 popular diets (Mediterranean, ketogenic, DASH, Dukan, low-carb, intermittent fasting...) based on 12 meta-analyses published between 2010 and 2024. Weight loss, metabolic markers, dropout rates, and long-term benefits, compared objectively.
- 06 Weight Loss Supplements vs Calorie Deficit: How Many Calories Do You Need to Burn to Lose a Kilogram?Rigorous comparison of the effectiveness of simple caloric deficit versus the most popular weight loss supplements, based on scientific literature. Synthesis of 10 meta-analyses and kinetic modeling by the NIH.
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