Roughly 80% of adults are deficient in Vitamin D, 50% are deficient in magnesium, and the average Western omega-6 to omega-3 ratio is 20:1 (ancestral was 2:1). Meanwhile, the $50 billion supplement industry sells you multivitamins with doses too low to fix anything and forms your body can barely absorb.
Four supplements have overwhelming evidence behind them. A handful more are worth taking based on bloodwork. Everything else is marketing.
Tier 1: The Foundation (Nearly Universal Benefit)
Vitamin D3 + K2
Why: Vitamin D functions as a hormone, not just a vitamin. It influences over 200 genes, modulates immune function, supports bone density, and correlates with testosterone levels in men. Over 80% of adults are below optimal levels.Dose: 5,000-10,000 IU D3 daily (adjust based on blood levels — target 50-70 ng/mL). Always pair with 100-200mcg Vitamin K2 (MK-7 form) to ensure calcium goes to bones, not arteries.
When: Morning, with a fat-containing meal (D3 is fat-soluble).
Evidence strength: Very strong. Hundreds of studies. The only debate is optimal dose.
Magnesium
Why: Involved in 600+ enzymatic reactions. Supports sleep quality, muscle relaxation, blood pressure regulation, insulin sensitivity, and stress response. ~50% of the US population is deficient.Forms matter:
- Magnesium L-Threonate — best for cognitive function and sleep (crosses blood-brain barrier)
- Magnesium Glycinate — best for general supplementation and sleep (well-absorbed, minimal GI issues)
- Magnesium Citrate — decent absorption but can cause loose stools (useful if constipation is an issue)
- Magnesium Oxide — cheap and poorly absorbed. Skip it.
Dose: 300-600mg elemental magnesium daily. Split into morning and evening doses if taking >400mg.
Evidence strength: Very strong. Deficiency is pandemic-level.
Omega-3 (EPA/DHA)
Why: Anti-inflammatory, neuroprotective, cardioprotective. The modern diet delivers an omega-6 to omega-3 ratio of ~20:1. Ancestral diet was ~2:1. This imbalance drives chronic inflammation.Dose: 2-4g combined EPA+DHA daily. Emphasize EPA if targeting inflammation; DHA if targeting cognitive function.
Form: Triglyceride form fish oil (not ethyl ester — check the label). Krill oil is fine but more expensive per gram of EPA/DHA. Algal oil for vegans.
When: With food (reduces fishy burps, improves absorption).
Evidence strength: Strong. Consistent cardiovascular and cognitive benefits in meta-analyses. Target Omega-3 Index of 8-12%.
Creatine Monohydrate
Why: The most researched supplement in sports nutrition history. Increases phosphocreatine stores for improved strength, power output, and high-intensity performance. Also shows neuroprotective effects and may support cognitive function.Dose: 5g daily. No loading phase needed (it just takes 3-4 weeks to saturate instead of 1). Take it every day, not just training days.
When: Timing doesn't matter. Just be consistent.
Evidence strength: Extremely strong. Hundreds of studies. Safe long-term profile. Works for everyone (except the ~5% of people who are non-responders due to naturally high baseline stores).
Tier 2: Targeted (Based on Testing or Specific Goals)
Zinc
Why: Essential for immune function, testosterone synthesis, and wound healing. Athletes lose zinc through sweat; vegetarians often have lower zinc status.Dose: 15-30mg daily. Don't exceed 50mg long-term without monitoring copper (zinc competes with copper absorption).
Form: Zinc picolinate or zinc bisglycinate (best absorption). Zinc gluconate is acceptable. Zinc oxide is poorly absorbed.
When: With food (reduces nausea). Don't take with calcium or iron simultaneously.
Test first: Serum zinc or RBC zinc. Supplement if below optimal, not blindly.
B-Complex (Methylated)
Why: B vitamins are critical for energy metabolism, methylation, neurotransmitter synthesis, and homocysteine management. ~40% of the population has MTHFR variants that impair folate metabolism.Key: Get methylated forms — methylfolate (not folic acid) and methylcobalamin (not cyanocobalamin). If you have MTHFR variants, unmethylated B vitamins can actually make things worse.
Dose: Follow label of a quality B-complex. Key numbers: B12 1,000mcg methylcobalamin, folate 800mcg methylfolate.
Test first: B12, homocysteine, and consider MTHFR genetic testing.
Ashwagandha (KSM-66)
Why: An adaptogen with consistent evidence for cortisol reduction (14-28% in trials), modest testosterone increase in stressed men, and anxiety reduction.Dose: 600mg KSM-66 extract daily.
When: Evening (if targeting sleep/cortisol) or morning (if targeting stress throughout the day).
Note: Standardized extracts matter. KSM-66 and Sensoril are the two forms with the most research behind them. Generic ashwagandha powder is poorly standardized.
Boron
Why: Trace mineral that supports free testosterone (by lowering SHBG), bone health, and cognitive function. Difficult to get adequate amounts from food alone.Dose: 6-10mg daily.
Evidence strength: Moderate. A few well-designed studies showing meaningful hormonal effects at low cost and zero side effect risk.
Tier 3: Situational
Berberine
For: Insulin resistance, elevated blood glucose, metabolic syndrome. Berberine activates AMPK — the same pathway as metformin — and has shown comparable glucose-lowering effects in several head-to-head trials.Dose: 500mg 2-3x daily with meals. GI side effects in the first week are common but usually resolve.
Note: This is essentially a pharmaceutical-grade intervention sold as a supplement. If you're on diabetes medications, consult your doctor (additive hypoglycemic risk).
Curcumin
For: Chronic inflammation, joint pain. Curcumin is a potent anti-inflammatory, but bioavailability is terrible without enhancement.Form: Longvida or Meriva (phospholipid complex) — these are 20-65x more bioavailable than standard curcumin powder. Standard turmeric capsules are largely useless.
Dose: 400-1,000mg enhanced curcumin daily.
Glycine
For: Sleep quality, collagen synthesis, glutathione production. 3g before bed lowers core body temperature and improves subjective sleep quality. Also supports liver detoxification via glutathione.Dose: 3g before bed.
Evidence strength: Moderate for sleep. Strong biochemical rationale for glutathione support.
What to Skip
- Multivitamins — Shotgun approach. Doses too low to fix deficiencies, may include forms you don't need or can't absorb. Build a targeted stack instead.
- BCAAs — If you eat adequate protein, BCAAs are redundant. Whey protein already contains BCAAs in better ratios.
- Testosterone boosters (Tribulus, Fenugreek, D-Aspartic Acid) — Marketing claims far exceed evidence. None show meaningful testosterone increases in well-designed trials.
- Glutamine — Unless you're severely ill or burned, your body makes plenty. The oral supplementation research for athletes is overwhelmingly negative.
- CLA (Conjugated Linoleic Acid) — Hyped for fat loss. Human trials show effects so small they're clinically meaningless.
- Collagen peptides (as sole protein source) — Collagen is an incomplete protein. It's fine for skin/joints as an addition, but don't count it toward your protein target.
Quality Matters
Supplements are not FDA-regulated for efficacy before sale. This means:
- Labels frequently don't match contents
- Heavy metal contamination is common in cheap brands
- Proprietary blends hide underdosed ingredients
Look for: Third-party testing (NSF Certified for Sport, Informed Sport, USP verified, or ConsumerLab tested). Brands like Thorne, Momentous, Pure Encapsulations, and Life Extension consistently pass independent testing.
Avoid: Amazon marketplace supplements from unknown brands, anything with "proprietary blend" on the label, and anything promising results that sound too good to be true.
The Stack Summary
Everyone (daily):
- Vitamin D3 5,000-10,000 IU + K2 200mcg (morning, with food)
- Magnesium Glycinate/Threonate 300-600mg (evening)
- Omega-3 2-4g EPA/DHA (with food)
- Creatine 5g (anytime)
Based on testing:
- Zinc 15-30mg (if low)
- B-Complex methylated (if homocysteine high or B12 low)
- Ashwagandha 600mg (if cortisol high / chronic stress)
- Boron 6-10mg (if free T low)
Total cost: $60-100/month for the foundation stack. Less than most people spend on coffee. The ROI on feeling and performing measurably better is infinite.
Stop guessing. Test, supplement the gaps, retest. That's the protocol.
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