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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.

Curated Stacks

Complete supplement protocols organized by goal. Each stack includes our top product picks, synergy interaction maps, timing schedules, and daily cost breakdowns. Start with the Foundation Stack.

Stack Guide
The Foundation Stack: 5 supplements everyone should take first
FoundationAthleteSleep
Magnesium, D3+K2, omega-3, creatine, multivitamin. The base layer every other stack builds on.
Stack Guide
The Cognitive Stack: best nootropics for focus & memory
CognitiveMood
Lion's Mane, Alpha-GPC, L-Theanine, Bacopa, Citicoline. Three synergy protocols.
Stack Guide
The Athlete Stack: strength, endurance & recovery
AthleteFoundation
Protein, beta-alanine, citrulline, ashwagandha. Muscle growth, endurance, and recovery protocols.
Stack Guide
The Sleep Stack: deep sleep beyond melatonin
SleepMood
L-Theanine, apigenin, glycine. The Huberman-inspired evening protocol.
Stack Guide
The Longevity Stack: healthspan & cellular aging
LongevityFoundation
NMN, resveratrol, CoQ10, curcumin. NAD+ optimization and mitochondrial protocols.
Stack Guide
The Mood Stack: stress resilience & emotional balance
MoodCognitiveSleep
Ashwagandha KSM-66, rhodiola, saffron extract. Calm focus and stress resilience protocols.

Product Roundups

"Best X supplement" guides with multiple brands tested and ranked. Each product is scored using our 6 proposition value system. The highest-converting content on the site — these help you choose the exact product to buy.

Product Roundup
Best magnesium supplements: 15 brands tested
FoundationSleepCognitiveAthlete
Glycinate vs. L-threonate vs. citrate. Which form for which stack.
Product Roundup
Best creatine supplements: 12 brands lab-tested
AthleteFoundationCognitive
Monohydrate vs. HCl. Thorne, Nutricost, Transparent Labs head-to-head.
Product Roundup
Best protein powders: 20 brands lab-tested
Athlete
Whey isolate, casein, plant-based. Label accuracy vs. actual protein content.

Single Product Reviews

In-depth reviews of specific products and brands. We break down ingredients, compare against building your own stack, and give our honest verdict using the 6 proposition value system.

Product Review
AG1 review: is Athletic Greens worth $79/month?
Foundation
AG1 Next Gen vs. building your own Foundation Stack. Honest cost comparison.
Coming Soon
Alpha Brain review: worth $79/bottle?
Onnit's flagship nootropic vs. building your own Cognitive Stack.
Coming Soon
Momentous supplements: worth the premium?
The Huberman-endorsed brand across magnesium, creatine, omega-3, and protein.

Research Deep Dives

Long-form articles exploring the science behind specific supplements. Clinical research analysis, dosage optimization, and evidence ratings. Coming soon — subscribe to The Weekly Stack to get notified.

Deep Dive
Lion's Mane: what the research actually says
NGF, BDNF, neurogenesis — the clinical evidence for cognitive benefits.
Deep Dive
Ashwagandha safety: the full picture
Thyroid effects, liver reports, anhedonia — who should and shouldn't take it.
Deep Dive
NMN vs. NR: the NAD+ precursor debate
Which pathway is better? What the human trials actually show.

The Weekly Stack

New reviews, deal alerts, and the one study worth reading — every Sunday.

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