Which supplements actually work, which are a waste of money, and how to intelligently combine the few with genuine evidence.
The global dietary supplement market exceeded $180 billion in 2023 — a figure that reflects the enormous human desire for convenient health optimization, not the quality of the scientific evidence supporting most products. An honest assessment of the supplement literature reveals that the vast majority of products either lack meaningful clinical evidence, have effect sizes too small to justify expense, or work only in populations with specific deficiencies. A small category of supplements, however, has compelling evidence across multiple independent trials for specific, clinically meaningful outcomes. Identifying and intelligently stacking this evidence-based minority is the core principle of rational supplementation.
The foundation stack encompasses the supplements with the broadest, most robust evidence for populations eating typical Western diets. Vitamin D3 (2,000–5,000 IU daily) is arguably the most important supplement for the majority of indoor-dwelling people in temperate climates: over 40% of the U.S. population has insufficient vitamin D levels (<20 ng/mL), and adequate vitamin D is required for immune function, bone density, testosterone production, mood regulation, and cardiovascular health. Magnesium glycinate (300–400mg) addresses the approximately 50% of Americans who are magnesium deficient — a deficiency that impairs sleep quality, muscle function, blood pressure regulation, and insulin sensitivity. Omega-3 EPA/DHA (2–3g daily) from fish oil or algae oil has over 50 years of cardiovascular research support.
Predict How Food Affects Your Body
Before You Eat.
Log glucose readings, energy levels, and sleep quality to build your personal metabolic fingerprint. Our platform then predicts the glucose spike, energy impact, and metabolic score of any meal before you eat it — and suggests real-time tweaks like 'add avocado to blunt the glucose spike' right on the meal card.
Smarter than calorie counting. Two meals with identical calories can have wildly different effects on your energy, cravings, and fat storage. Metabolic Intelligence reveals the difference.
Free to use · No credit card required
## The Foundation Stack: What Everyone Needs The performance stack builds on the foundation with compounds that have evidence specifically for athletic and cognitive performance. Creatine monohydrate (5g daily) is the most extensively researched performance supplement in history, with over 1,000 studies and consistent evidence for increased strength, power output, muscle mass, and (increasingly recognized) cognitive performance and neuroprotection. It is safe for long-term use. Caffeine (3–6mg/kg body weight) remains the most evidence-supported acute performance enhancer — a meta-analysis of 300+ studies confirms meaningful improvements in endurance, strength, reaction time, and cognitive function. Beta-alanine (3.2–6.4g daily) reduces muscle acidosis during high-intensity efforts lasting 60–240 seconds and has strong meta-analytic support for repeat sprint performance.
"Creatine monohydrate has over 1,000 published studies. It consistently improves strength, power, muscle mass — and increasingly, cognitive performance and neuroprotection."
Detox Yourself
A complete video guide to safe, effective detoxification.
## The Performance Stack: For Athletes The longevity stack targets biological aging mechanisms with compounds that have meaningful evidence in human studies. NMN or NR (nicotinamide mononucleotide / nicotinamide riboside, 250–500mg daily) are NAD+ precursors that have shown ability to raise NAD+ levels in human trials — NAD+ declines approximately 50% by age 50 and is critical for DNA repair, mitochondrial function, and sirtuin activation. Human trial data on long-term outcomes is still limited. Berberine (500mg 2–3x daily with meals) activates AMPK (the cellular energy sensor) with effects on glucose metabolism, lipid levels, and insulin sensitivity comparable to metformin in multiple randomized trials — making it one of the most evidence-supported metabolic supplements available.
## The Longevity Stack: For Healthy Aging Timing and combination strategies dramatically affect supplement efficacy. Fat-soluble supplements (vitamin D, K2, omega-3) should be taken with the fattiest meal of the day for maximum absorption. Magnesium is best taken 1–2 hours before bed for sleep benefit. Creatine timing relative to workouts has modest effects — consistency of daily intake matters more than timing. Caffeine should be cycled (5 days on, 2 days off) to prevent complete tolerance habituation. NMN/NR is best taken in the morning to align with circadian NAD+ rhythms. Berberine should be taken with meals to leverage its glucose-lowering effects at the time of carbohydrate consumption.
"Over 40% of Americans have insufficient vitamin D, and deficiency impairs immunity, bone density, testosterone, mood, and cardiovascular health. This is the highest-priority supplement for most people."
🧠 You're not hungry, you're bored. Try a 2-min walk.
✅ 340 kcal under target — on track!
🌅 Skipping breakfast causes 3pm crashes. Fuel up!
🍫 Craving chocolate? That's low magnesium. Try almonds.
😤 Stressed? Don't eat — breathe 4-7-8 for 60 seconds.
We Put Your Journey on Autopilot.
Once assessed, our optional notifications act as "Just-in-Time Adaptive Interventions" (JITAI) — a digital therapist in your pocket. Behavioural scientists say lasting change happens when Motivation, Ability, and a Prompt converge at the same moment. Our coach delivers exactly that, learning from your logged meals, moods, and habits to become more accurate over time. Instead of generic reminders, Marcus sends context-aware nudges grounded in CBT — challenging the specific thought patterns that derail your progress, right when they're most likely to strike.
Your Coach Never Sleeps.
Marcus sends intelligent CBT-based push notifications that rewire your decisions in real time — challenging cognitive distortions before the damage is done.
## Timing and Combination Strategies Interactions between supplements and medications require careful consideration. Fish oil increases bleeding time and should be discussed with physicians by anyone on anticoagulants. Berberine can interact with diabetes medications. St. John's Wort (common in 'stress' stacks) interferes with numerous medications. Vitamin K2 (often paired with D3) affects warfarin function. The supplement industry's status as largely unregulated means that products may contain undisclosed ingredients, incorrect dosages, or contamination — third-party testing certification (NSF International, Informed Sport, USP) is essential for any supplement you use consistently.
The hierarchy for performance optimization should always be: sleep first, nutrition second, exercise third, then consider supplements. Supplements work best as additions to an optimized lifestyle foundation, not compensations for inadequate fundamentals. A well-constructed foundation + performance stack (Vitamin D, Magnesium, Omega-3, Creatine, Caffeine) costs approximately $80–120 per month and has stronger cumulative evidence than most sophisticated and expensive biohacking supplement protocols.
Marcus Webb
Performance Coach
Expert contributor at our health & wellness platform, bringing evidence-based insights to help you achieve your nutrition and fitness goals.
