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March 2026: The Cognitive Stack guide just updated — 3 new nootropics tested →
8 curated stacks · 200+ products reviewed · 6 proposition value metrics

Your goals. Your stack.

We build evidence-based supplement stacks for specific outcomes — cognitive performance, athletic recovery, deep sleep, longevity, and more. Every product rated on 6 objective metrics. No guesswork.

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200+
Products tested
8
Curated stacks
6
Prop-value metrics
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🧠
The Cognitive Stack
Focus, memory, mental clarity, neuroprotection. Nootropics and brain-health compounds rated for real cognitive outcomes.
14 supplements · 6 guides
🏋️
The Athlete Stack
Strength, endurance, recovery, body composition. Performance supplements for lifters and generalized health seekers alike.
18 supplements · 8 guides
The Longevity Stack
Cellular health, anti-aging pathways, NAD+, sirtuins. The Attia/Huberman-informed stack for healthspan optimization.
10 supplements · 4 guides
🌙
The Sleep Stack
Sleep onset, deep sleep architecture, HRV improvement, next-day readiness. Beyond melatonin.
8 supplements · 4 guides
🛡️
The Immunity Stack
Immune resilience, gut-barrier integrity, seasonal defense. The daily shield protocol.
9 supplements · 3 guides
The Glow Stack
Skin elasticity, hair thickness, nail strength. Collagen, biotin, and the compounds that actually work from the inside out.
7 supplements · 3 guides
☀️
The Mood Stack
Stress resilience, calm focus, emotional balance. Adaptogens and neurotransmitter support that's actually researched.
8 supplements · 3 guides
🧱
The Foundation Stack
The daily essentials everyone needs before anything else. Vitamin D, magnesium, omega-3 — the unsexy basics that matter most.
6 supplements · 5 guides

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How we rate: the 6 Health Britannica metrics

Every supplement on Health Britannica is scored across the same 6 proposition values. This system gives you an objective way to compare any product, in any category, across any stack. It's how we maintain brand consistency across 200+ reviews.

🔬Evidence
Strength of clinical research. RCTs > observational > animal > anecdotal.
🧪Purity
Third-party testing, heavy metals, label accuracy. Does the bottle match the label?
💰Value
Cost per effective dose vs. competitors. Premium justified or cheaper equal exists?
Efficacy
Does it work at the dose provided? Clinically effective dose vs. what's in the product.
🛡️Safety
Side effects, drug interactions, long-term safety data. Conservative risk assessment.
🔄Synergy
How well it pairs with other stack supplements. Absorption enhancers, cofactors, timing.

Latest reviews by stack

1
Best magnesium supplements in 2026
FoundationAthleteSleep
Glycinate, L-threonate, citrate, or oxide? We tested 15 brands across absorption, purity, and value. The form matters more than the brand.
🔬Evidence9.5
💰Value8.8
Efficacy9.2
9.4
Overall
Read review →
2
Best creatine supplements
AthleteFoundation
The most researched supplement in sports science. Monohydrate is king — but not all brands are equal on purity and price.
🔬Evidence9.8
💰Value9.5
🛡️Safety9.7
9.6
Overall
Read review →
3
Best protein powders: 20 brands lab-tested
Athlete
Third-party lab testing revealed big gaps between label claims and actual protein content. Some "premium" brands failed hard.
🧪Purity9.0
💰Value9.4
Efficacy9.0
9.2
Overall
Read review →
4
Best sleep supplements (beyond melatonin)
SleepMood
Magnesium glycinate, L-theanine, apigenin, glycine — the compounds that actually improve sleep architecture without grogginess.
🔬Evidence8.5
🛡️Safety9.2
🔄Synergy9.0
8.9
Overall
Read review →
5
Best nootropic stacks for focus & memory
CognitiveMood
We spent 3 months testing pre-built stacks and custom combinations. Here's what actually moved the needle on sustained focus.
🔬Evidence7.5
Efficacy8.5
🔄Synergy9.0
8.8
Overall
Read review →
6
Best omega-3 / fish oil supplements
LongevityFoundation
EPA/DHA ratios, oxidation testing, heavy metal screening. Most fish oil oxidizes on the shelf — here are the ones that don't.
🧪Purity9.0
🔬Evidence9.3
💰Value7.5
8.7
Overall
Read review →
🏆 #1 Foundation Pick
Momentous Magnesium L-Threonate
$44.95/mo · Subscribe & save 15%
Highest bioavailability, crosses the blood-brain barrier. #1 in Foundation + Sleep + Cognitive stacks.
Check price →

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