Health Britannica
All Guides & Reviews
Every supplement guide on Health Britannica, organized by type. Curated stacks, product roundups, single product deep-dives, and more, all using our 6 proposition value scoring system.
Newest article
Stack Guide
The Foundation Stack: 5 Supplements Everyone Should Take First (2026)
Foundation
Athlete
Sleep
Longevity
The 5 supplements that form the base layer of every Health Britannica protocol, with exact brands and doses.
March 2026 · 16 min
Stack Guide
The Cognitive Stack: Focus, Memory, Brain Health
March 2026 · 18 min
Stack Guide
The Athlete Stack: Strength, Endurance, Recovery
March 2026 · 18 min
Newest article
Product Roundup
Best Creatine 2026: Certification Checked, HCl Claims Tested
Athlete
Foundation
Cognitive
Monohydrate is the form with the evidence, HCl's advantage is solubility rather than absorption, and two widely recommended creatines are not in the NSF database at all. Plus what the kidney and cognition evidence really says.
March 2026 · 15 min
Product Roundup
Greens Powders 2026: What the Trials Do Not Show
March 2026 · 14 min
Product Roundup
Best Magnesium 2026: What the Absorption Data Shows
March 2026 · 15 min
Newest article
Research Guide
Ashwagandha KSM-66: Benefits, Safety, Dosage & Best Brands (2026)
Ashwagandha is the most popular adaptogen, and the most controversial supplement we cover. Benefits, safety risks, dosage, and best KSM-66 brands.
March 2026 · 16 min
Research Guide
Berberine: Dosage, GLP-1 Link and Evidence (2026)
March 2026 · 18 min
Research Guide
Best Mushroom Coffee 2026: 4 Brands Compared
March 2026 · 14 min
Curated Stacks
Complete supplement protocols organized by goal. Each stack includes our top product picks, synergy interaction maps, timing schedules, and daily cost breakdowns.
Newest article
Stack Guide
The Foundation Stack: 5 Supplements Everyone Should Take First (2026)
Foundation
Athlete
Sleep
Longevity
The 5 supplements that form the base layer of every Health Britannica protocol, with exact brands and doses.
March 2026 · 16 min
Stack Guide
The Cognitive Stack: Focus, Memory, Brain Health
Cognitive
Mood
Longevity
The 8 most evidence-backed nootropic compounds with synergy protocols for focus, memory, and neuroprotection.
March 2026 · 18 min
Stack Guide
The Athlete Stack: Strength, Endurance, Recovery
Athlete
Foundation
Performance-specific compounds that help you train harder, recover faster, and build more lean mass.
March 2026 · 18 min
Stack Guide
The Sleep Stack: Beyond Melatonin (2026)
Sleep
Mood
Athlete
Targeting sleep onset, deep sleep architecture, and HRV improvement with compounds that work beyond melatonin.
March 2026 · 14 min
Stack Guide
The Longevity Stack: Healthspan and Cellular Aging
Longevity
Foundation
Cognitive
Compounds that target specific aging pathways: NAD+ decline, mitochondrial dysfunction, chronic inflammation, and cellular senescence.
March 2026 · 16 min
Stack Guide
The Mood Stack: Supplements for Stress Resilience
Mood
Cognitive
Sleep
Adaptogens and targeted compounds that help your body handle stress without the crash-and-burn cycle.
March 2026 · 12 min
Stack Guide
The Immunity Stack: Best Supplements for Immune Resilience (2026)
Immunity
Foundation
6 compounds with real clinical evidence for reducing infection frequency, shortening illness duration, and supporting immune cell function.
March 2026 · 10 min
Stack Guide
The Glow Stack: Best Supplements for Skin, Hair & Nails (2026)
Glow
Longevity
5 compounds that address skin, hair, and nails from the inside out with real clinical trial evidence.
March 2026 · 10 min
Stack Guide
The Anti-Inflammatory Stack: Curcumin, Omega-3
Longevity
Athlete
Immunity
Three compounds, three inflammatory pathways, one protocol. Curcumin targets NF-κB and COX-2. Boswellia targets 5-LOX. Omega-3 produces resolvins that actively resolve inflammation. Together: comprehensive coverage at ~$2.50/day.
March 2026 · 16 min
Product Roundups
"Best X supplement" guides with multiple brands tested and ranked. Each product is scored using our 6 proposition value system.
Newest article
Product Roundup
Best Creatine 2026: Certification Checked, HCl Claims Tested
Athlete
Foundation
Cognitive
Monohydrate is the form with the evidence, HCl's advantage is solubility rather than absorption, and two widely recommended creatines are not in the NSF database at all. Plus what the kidney and cognition evidence really says.
March 2026 · 15 min
Product Roundup
Greens Powders 2026: What the Trials Do Not Show
Foundation
One AG1 serving supplies 2g of fiber against a 28g daily value, slightly less than a cup of raw broccoli. And 86% of the scoop is disclosed only as four proprietary blend totals. The category's evidence gap is the finding.
March 2026 · 14 min
Product Roundup
Best Magnesium 2026: What the Absorption Data Shows
Foundation
Sleep
Cognitive
Athlete
Mood
Longevity
Magnesium oxide's famous 4% figure comes from one study of 16 people using a urinary surrogate. Glycinate has no head-to-head absorption trial at all. Here is what the evidence actually supports, and which products are verified in a certification database.
March 2026 · 15 min
Product Roundup
Best Nootropic Supplements & Pre-Built Stacks in 2026: Ranked
Cognitive
Mood
We ranked the best nootropic supplements and pre-built stacks. DIY vs pre-built cost comparison included.
March 2026 · 14 min
Product Roundup
Best Omega-3 2026: Which Brands Are Actually Certified
Foundation
Athlete
Longevity
Mood
IFOS no longer publishes star ratings, and several brands described everywhere as IFOS-tested are not in the database at all. We checked all of them, and reconciled the two studies that disagree about how oxidised retail fish oil really is.
March 2026 · 15 min
Product Roundup
Best Pre-Workout Supplements in 2026: 5 Products Tested & Ranked
Athlete
We audited 5 pre-workouts against clinical evidence. Ingredient doses, pricing, and a DIY alternative at $0.55/serving.
March 2026 · 14 min
Product Roundup
Best Probiotic Supplements in 2026: Strains, CFUs & Brands Ranked
Foundation
We ranked 6 probiotic supplements by strain evidence, CFU count, survivability, and value.
March 2026 · 10 min
Product Roundup
Best Protein Powder 2026: What 3 Lab Tests Found
Athlete
Consumer Reports, the Clean Label Project and ConsumerLab all tested protein powder for heavy metals and got very different answers. Here is what each actually found, which certifications survive a database check, and what to buy.
March 2026 · 14 min
Product Roundup
Best Sleep Supplements in 2026: 8 Products Ranked
Foundation
Sleep
Mood
We ranked 8 sleep supplements. DIY sleep stack costs $0.31/day and targets three different sleep mechanisms.
March 2026 · 12 min
Product Roundup
Best Vitamin D Supplements in 2026: D3+K2 Brands Ranked
Foundation
We ranked 5 Vitamin D3+K2 supplements on dose, form, third-party testing, and value. Why K2 matters and how much D3 you need.
March 2026 · 10 min
Product Roundup
Best Budget Magnesium in 2026: The Cheapest Forms That Actually Work
Foundation
The cheapest magnesium that actually works costs about $0.13 to $0.18 a serving in glycinate, and the cheapest genuine USP seal is around $0.36. We rank budget picks by $/serving and show why the form matters and the premium branding does not.
July 2026 · 14 min
Product Roundup
Best Budget Vegan Protein Powder in 2026: Cheapest Per Serving That Still Gets Tested
Foundation
Cheapest per serving matters, but not if the tub is untested. We rank budget vegan proteins by cost per serving using only picks that carry genuine third-party testing, and give you the price-versus-tested quadrant.
July 2026 · 13 min
Product Roundup
Best Electrolytes for GLP-1 (Ozempic) Users in 2026: What Actually Helps the Cramps and Lightheadedness
Foundation
An honest guide to electrolytes on a GLP-1: use them for symptom relief, not on a schedule, and mind the sodium. With a sodium/sugar/price comparison and the picks that make sense.
July 2026 · 14 min
Product Roundup
Best Fiber for GLP-1 (Ozempic) Constipation in 2026: Why Psyllium Wins
Foundation
Constipation is a common GLP-1 side effect and psyllium is the best-studied fix. The evidence-first fiber guide with the dosing method, the picks, and $/serving.
July 2026 · 13 min
Product Roundup
Best Magnesium for Anxiety in 2026: What the Evidence Supports
Foundation
Magnesium glycinate is the best form to try for anxiety, and honest about the modest, suggestive evidence. Third-party-tested picks by $/serving, glycinate vs threonate, and what the research really shows.
July 2026 · 15 min
Product Roundup
Best Magnesium for Constipation in 2026: Citrate, Oxide, and What Actually Works
Foundation
Citrate and oxide are the magnesium forms for constipation - osmotic laxatives that draw water into the gut, and magnesium's strongest evidence. Picks by cost, real dosing, how fast it works, and the kidney caution.
July 2026 · 15 min
Product Roundup
Best Magnesium for Muscle Cramps in 2026: The Honest Evidence
Foundation
The honest version: a Cochrane review found magnesium is unlikely to give clinically meaningful cramp relief, and there are no trials at all for exercise cramps. If you still want to try it, glycinate or malate are the sensible forms - but rule out the real causes first.
July 2026 · 13 min
Product Roundup
Best Magnesium for Women in 2026: PMS, Sleep, Bone, and the Honest Picture
Foundation
Women's magnesium, decoded: the 310 to 320 mg RDA, the use cases where the evidence is best (sleep, migraine, bone), an honest read on PMS, and third-party-tested picks by cost per serving.
July 2026 · 15 min
Product Roundup
Best Magnesium Glycinate for Sleep in 2026: The Honest Guide and Form-by-Form Matrix
Foundation
Magnesium glycinate is the best form for sleep, and honest about the modest payoff. Third-party-tested picks by $/serving, the full form-by-form matrix, and what the trials really show.
July 2026 · 16 min
Product Roundup
Best Magnesium Gummies in 2026: What to Know Before You Buy
Foundation
Magnesium gummies taste great but hide two catches: 'glycinate' labels that quote compound weight, and lower elemental doses than capsules. We verified the form, elemental mg, sugar, and testing on every pick.
July 2026 · 14 min
Product Roundup
Best Magnesium L-Threonate (Magtein) for Brain and Focus in 2026
Foundation
Magnesium L-threonate (Magtein) is the one magnesium form shown to cross into the brain, and small trials hint at a cognitive edge - but the evidence is preliminary and industry-funded. The tested picks, the honest dose, and what the trials really show.
July 2026 · 15 min
Product Roundup
Best Multivitamin for Ozempic / GLP-1 Users in 2026: What Actually Fills the Gaps
Foundation
Which multivitamin covers the calcium, iron, vitamin D and B12 gaps documented in GLP-1 users - with a certifier/iron/form/$-per-month table and the honest verdict on 'GLP-1 companion' packs.
July 2026 · 14 min
Product Roundup
Best Organic Vegan Protein Powder in 2026: Why Organic and Metal-Tested Are Not the Same Thing
Foundation
Organic certifies your protein against pesticides, not heavy metals, and the testing data is counter-intuitive: certified-organic powders averaged about three times the lead of non-organic. Here are the organic vegan proteins that are also independently metal-tested.
July 2026 · 14 min
Product Roundup
Best Plant-Based Protein Powder in 2026: The Honest Rankings, Amino Matrix, and Heavy-Metal Truth
Foundation
Plant protein matches whey for muscle when matched for protein and leucine, and the heavy-metal transparency story is the real differentiator. Tested picks, the amino matrix, and the honest evidence.
July 2026 · 17 min
Product Roundup
Best Protein for GLP-1 (Ozempic) Users in 2026: The Muscle-Sparing Pick
Foundation
Whey isolate is the best protein for most GLP-1 users because it delivers the most protein per calorie when appetite caps your intake. The dairy-free match, the RTD shakes for low appetite, and the target - with $/serving and cert tables.
July 2026 · 16 min
Product Roundup
Best Supplements for GLP-1 (Ozempic) Users in 2026: What the Evidence Actually Supports
Foundation
The short, evidence-backed supplement list for people on a GLP-1 drug, with $/serving and cert tables, the muscle-loss math, and the honest reason to skip berberine.
July 2026 · 17 min
Product Roundup
Best Supplements for Muscle Loss on GLP-1 (Ozempic) in 2026: What Actually Preserves Lean Mass
Foundation
The evidence-backed short list for keeping muscle on Ozempic or Zepbound: protein first, creatine second, resistance training as the non-negotiable foundation, with $/serving and cert tables and the honest take on HMB and EAAs.
July 2026 · 16 min
Product Roundup
Best Tasting Vegan Protein Powder in 2026: The Honest Rankings on Flavor, Texture, and What Reviewers Actually Say
Foundation
The best-tasting vegan protein is the one that masks pea's earthy note with a good blend, a clean sweetener, and real mixability. We rank the crowd favorites on the factors that actually drive taste - and flag why daily drinkers should favor vanilla.
July 2026 · 12 min
Product Roundup
Best Third-Party-Tested Magnesium in 2026: USP, NSF, and Who Actually Certifies
Foundation
Most magnesium brands say third-party tested but self-test. Here is what USP, NSF, and Informed Sport each actually verify, which products carry a real seal, and why it matters when the FDA never checked.
July 2026 · 15 min
Product Roundup
Best Unflavored Vegan Protein Powder in 2026: The Cleanest, Additive-Free Bases, Tested and Ranked
Foundation
Unflavored vegan protein is the clean, additive-free base for smoothies and baking, and the way to control your own sugar. We rank the short-ingredient, tested picks and tell the honest truth about earthy pea and amino completeness.
July 2026 · 12 min
Product Roundup
Best Vegan Protein for Muscle Gain in 2026: The Leucine-and-Dose Math, Ranked
Foundation
Vegan protein equals whey for muscle when matched for protein and leucine. Plant runs lower in leucine, so you need a bigger dose - around 30 g - to clear the trigger. The math, and the picks that clear it.
July 2026 · 15 min
Product Roundup
Best Vegan Protein Powder for Weight Loss in 2026: The Honest, Protein-Per-Calorie Rankings
Foundation
No plant protein burns fat. It works for weight loss through satiety and muscle preservation in a deficit. We rank picks on protein per calorie, sugar, fiber, and third-party testing, and kill the detox marketing.
July 2026 · 13 min
Product Roundup
Best Vegan Protein Powder for Women in 2026: What Actually Makes One Better (It Is Not the Pink Label)
Foundation
There is no separate 'women's protein' in the science - intake is set by body weight and goal (1.4 to 2.0 g/kg). What a good pick for women actually means is complete aminos, real heavy-metal testing, and a clean label. Here are the ones that deliver.
July 2026 · 13 min
Product Roundup
Creatine on GLP-1 (Ozempic): Does It Help Preserve Muscle? (2026)
Foundation
Creatine monohydrate has strong evidence for preserving lean mass - but only if you resistance-train. The dose, the kidney myth, the water-weight question, and three NSF-certified picks with $/serving.
July 2026 · 14 min
Product Roundup
GLP-1 Supplements for Women (Ozempic/Wegovy) in 2026: What Changes and What Doesn't
Foundation
The women-specific supplement priorities on Ozempic or Wegovy: iron (18 mg, but test first), calcium and bone protection, protein for muscle, and the honest read on hair loss.
July 2026 · 15 min
Product Roundup
Lowest Heavy-Metal Protein Powder in 2026: The Cleanest, Most-Tested Picks Ranked by Transparency
Foundation
Nearly half of tested protein powders exceeded a Prop-65 metal threshold, and organic ran higher, not lower. We rank the cleanest picks by transparency tier: Clean Label Project certified first, published panels next, sport-certified last.
July 2026 · 14 min
Research Guides
Long-form articles exploring the science behind specific supplements. Clinical research analysis, dosage optimization, and evidence ratings.
Newest article
Research Guide
Ashwagandha KSM-66: Benefits, Safety, Dosage & Best Brands (2026)
Ashwagandha is the most popular adaptogen, and the most controversial supplement we cover. Benefits, safety risks, dosage, and best KSM-66 brands.
March 2026 · 16 min
Research Guide
Berberine: Dosage, GLP-1 Link and Evidence (2026)
Berberine is having a massive moment, driven by the 'nature's Ozempic' claim. That comparison is overstated, but the actual science is genuinely impressive.
March 2026 · 18 min
Research Guide
Best Mushroom Coffee 2026: 4 Brands Compared
The mushroom coffee market hit $2.3 billion, but virtually all positive human studies used doses 4-10x higher than what's in a cup. We ranked 6 brands honestly.
March 2026 · 14 min
Research Guide
Best Mushroom Supplements 2026: 5 Ranked
Functional mushrooms are the fastest-growing herbal segment. But most cheap products are predominantly rice starch. We tested products across 5 species to find the real ones.
March 2026 · 16 min
Research Guide
Turmeric & Curcumin 2026: The Absorption Claims, Checked
The 45x and 29x absorption claims are manufacturer-funded and measured on inactive metabolites. The one independent study found most enhanced forms undetectable. And the NIH now rates turmeric a well-documented cause of liver injury.
March 2026 · 15 min
Research Guide
Caffeine + L-Theanine: Dose Ratios and Evidence
The most-studied nootropic combination in existence. A 2022 systematic review concluded it's 'likely a safe and effective cognitive enhancer.' Full protocol guide.
March 2026 · 14 min
Research Guide
Lions Mane: NGF, Brain Benefits and Dosage (2026)
Lion's Mane is the only dietary supplement with published evidence for stimulating NGF and BDNF production in humans. Full evidence review and best products.
March 2026 · 16 min
Research Guide
Medical Cannabis 2026: What the Research Shows
A sweeping JAMA review examined over 2,500 cannabis papers. This guide walks through every major condition, ranks the evidence, and explains the rescheduling situation.
March 2026 · 22 min
Research Guide
NMN vs NR: Which NAD+ Supplement Actually Works? (2026)
NAD+ fuels mitochondrial energy and activates sirtuins. Two precursors promise to restore declining levels. This deep dive covers the biochemistry, evidence, and recommendations.
March 2026 · 16 min
Research Guide
Rhodiola Rosea: The Adaptogen for Energy Without Stimulants (2026)
Rhodiola is the morning adaptogen: where ashwagandha calms, rhodiola energizes. Evidence for fatigue reduction, cognitive performance, and endurance.
March 2026 · 8 min
Research Guide
Saffron for Mood: The Clinical Trial Evidence
Saffron extract at 30mg/day produces antidepressant effects comparable to fluoxetine in clinical trials, with significantly fewer side effects.
March 2026 · 8 min
Research Guide
Boswellia Serrata: Joint and Gut Evidence (2026)
Boswellic acids inhibit 5-lipoxygenase, a completely different inflammatory pathway than NSAIDs or curcumin. The clinical evidence for joints and gut health is stronger than most people realize.
March 2026 · 16 min
Research Guide
Curcumin Absorption: What the Human Trials Show
Curcumin has 200+ RCTs but raw turmeric has less than 1% bioavailability. This deep dive covers the 3 bioavailable forms that solved the absorption problem, and what the clinical evidence actually shows.
March 2026 · 18 min
Research Guide
Rhodiola Rosea: Evidence for Stress and Fatigue
Rhodiola rosea has more clinical trial data in stressed human populations than almost any other adaptogen. This deep dive covers the RCTs, the mechanisms, and why it works differently than ashwagandha.
March 2026 · 17 min
Research Guide
Supplements and Heart Rhythm: The QT Safety Map
QT prolongation is one of the few supplement-safety questions where the evidence base is unusually clear. This guide walks the named botanicals with documented hERG / QT signal, the drug-supplement combinations that drive most reported events, and where the cardioprotective evidence holds up.
May 2026 · 22 min
Research Guide
Berberine vs Ozempic: What the Trials Actually Show (2026)
Berberine is not 'nature's Ozempic.' It works by a different, far weaker mechanism, and its blood-sugar effect is about a third of semaglutide's. The honest, trial-by-trial comparison.
July 2026 · 14 min
Research Guide
Complete vs Incomplete Plant Proteins: The Amino Acid Guide (2026)
What complete means, the limiting amino acid in every plant source, why pea plus rice equals complete, DIAAS vs the older PDCAAS, and the outdated combine-at-every-meal myth - in one amino matrix.
July 2026 · 13 min
Research Guide
Do You Actually Need Supplements on Ozempic? An Honest Guide (2026)
The de-hyped buyer's guide to supplements on a GLP-1: which two have a real evidence case, which are symptom-only, what to skip, and when to get a blood test instead of guessing.
July 2026 · 14 min
Research Guide
GLP-1 Muscle Loss: How to Prevent It (What the Trials Show, 2026)
Roughly a quarter to 40% of GLP-1 weight loss is lean mass. The trials are clear on the fix: resistance training and hitting a protein target, with creatine third. Here is the math and the plan.
July 2026 · 15 min
Research Guide
What Nutrients Do GLP-1 Drugs Deplete? The Evidence in 2026
The reference explainer on GLP-1 nutrient gaps: what the drugs actually do (suppress intake, not deplete), the documented shortfalls in calcium, iron and vitamin D, the muscle you lose, the blood tests to ask for, and how to fix each gap.
July 2026 · 16 min
Research Guide
Heavy Metals in Protein Powder: What the Testing Actually Found (2026)
Nearly half of protein powders exceeded a Prop-65 metal threshold, plant averaged 5x the cadmium of whey, and organic ran higher, not lower. Here is what that means and how to shop safely.
July 2026 · 13 min
Research Guide
How Much Magnesium for Sleep? Dosing, Timing, and the Upper Limit (2026)
About 200 mg of elemental magnesium as glycinate, 1 to 2 hours before bed, under the 350 mg/day upper limit. The label trap, the ceiling, drug spacing, and why more is not better - every number cited.
July 2026 · 12 min
Research Guide
How Much Protein Do You Actually Need Per Day? The 2026 Intake Guide
The RDA prevents deficiency; it is not optimal. The evidence-based range for muscle is 1.4 to 2.0 g/kg, rising to 2.3 to 3.1 g/kg in a deficit. Per-meal dose, the leucine trigger, and a table for your weight.
July 2026 · 13 min
Research Guide
Is Magnesium Glycinate Safe to Take Long-Term? (2026)
Nightly magnesium glycinate is safe long-term for healthy adults under the 350 mg/day supplemental limit. Kidney disease is the real exception. The UL, the warning signs, and who needs a doctor first.
July 2026 · 12 min
Research Guide
Is Plant Protein as Good as Whey? The Honest Answer (2026)
Three randomized trials say plant protein builds muscle as well as whey when matched for protein and leucine. The real differences are leucine density, DIAAS quality, and digestion - and the honest wins land on both sides.
July 2026 · 14 min
Research Guide
Magnesium and Sleep: What the Research Actually Shows (2026)
Magnesium has a real but modest effect on sleep, strongest in people with low intake, and it is not a treatment for insomnia. A fair, trial-by-trial reading of the actual evidence.
July 2026 · 13 min
Research Guide
Magnesium Forms Compared: Glycinate vs Citrate vs Oxide vs Threonate (2026)
The definitive, fully sourced magnesium forms matrix: elemental content, real relative bioavailability, and laxative effect for glycinate, citrate, oxide, threonate, malate, and more, with a goal-to-form router and no fabricated absorption charts.
July 2026 · 18 min
Research Guide
Pea Protein vs Whey Protein: The Head-to-Head (2026)
Pea builds muscle as well as whey when matched for protein and leucine, and it is lactose-free. Whey has the better amino score and lower heavy metals. The honest, cited head-to-head on both.
July 2026 · 13 min
Research Guide
Protein Target on Ozempic: How Much You Actually Need (2026)
How much protein you actually need on a GLP-1, in grams: the ISSN-backed g/kg ranges, a bodyweight table with whey-scoop math, and why a suppressed appetite makes a protein supplement close to mandatory.
July 2026 · 12 min
Research Guide
Signs of Magnesium Deficiency (and Who's at Risk) in 2026
Blood tests miss most magnesium deficiency, and nearly half of Americans get too little from food. The early signs, the at-risk groups, why serum is a poor marker, and how to fix it.
July 2026 · 14 min
Research Guide
When and How to Take Magnesium: Timing, Food, and Drug Interactions (2026)
With food to avoid stomach upset, in the evening for sleep, split larger doses. The one rule that matters: space magnesium away from bisphosphonates, certain antibiotics, and other drugs it blocks. The full interaction table, cited to the NIH ODS.
July 2026 · 13 min
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