Medical Disclaimer: Supplements are not FDA-approved drugs. Third-party testing (NSF, USP, Informed Sport) is essential. Consult a healthcare provider before starting, especially if pregnant, nursing, on medications, or have medical conditions. This guide evaluates evidence — it does not prescribe.
Key Takeaways
- Most supplements don’t work. Of 50,000+ products, <10 have Grade A evidence for healthy adults.
- Form, dose, and third-party testing matter more than brand. Creatine monohydrate = creatine monohydrate (if pure).
- Proprietary blends = red flag. They hide underdosing. Demand full label transparency.
- Foundation first: Sleep, nutrition, training, stress management. Supplements are 1–2% at most.
- Cycling matters. Caffeine needs cycling; creatine doesn’t. Know which is which.
Our Evaluation Framework
| Criterion | What We Check | Weight |
|---|---|---|
| Human Evidence | RCTs, meta-analyses, effect size, consistency, population relevance | 40% |
| Dose-Response | Effective dose from studies vs. product dose; form bioavailability | 25% |
| Safety Profile | Side effects, drug interactions, contraindications, long-term data | 20% |
| Quality Assurance | Third-party testing (NSF/USP/Informed Sport), CoA transparency, manufacturing | 15% |
The “Essential 8”: Grade A Supplements (Most Adults Benefit)
| Supplement | Primary Benefit | Effective Dose | Best Form | Cost/Serving |
|---|---|---|---|---|
| Creatine Monohydrate | Strength, power, muscle, cognition | 5g/day (loading optional) | Creapure® micronized | $0.05 |
| Vitamin D3 + K2 | Bone, immune, mood, testosterone | D3: 2000–5000 IU + K2: 100–200mcg MK-7 | D3 cholecalciferol + K2 MK-7 | $0.10 |
| Omega-3 (EPA/DHA) | Heart, brain, joints, inflammation | 1–2g combined EPA/DHA | rTG form, IFOS 5-star, low TOTOX | $0.30–0.50 |
| Magnesium Glycinate/Threonate | Sleep, relaxation, muscle, insulin sensitivity | 200–400mg elemental | Glycinate (sleep) / Threonate (cognitive) | $0.15 |
| Protein Powder (Whey/Plant) | Convenience, muscle, satiety | 20–40g/serving | Whey isolate / pea-rice blend | $0.80–1.50 |
| Caffeine | Focus, performance, fat oxidation | 3–6mg/kg (200–400mg) | Anhydrous tablet or coffee | $0.02 |
| Beta-Alanine | High-intensity endurance (1–4 min) | 3.2–6.4g/day chronic | CarnoSyn® sustained-release | $0.10 |
| Citrulline Malate | Blood flow, pump, volume tolerance | 6–8g (2:1 ratio) | 2:1 Citrulline:Malate | $0.20 |
Condition-Specific Grade A/B
| Condition / Goal | Supplement | Grade | Dose | Notes |
|---|---|---|---|---|
| Sleep onset | Glycine + Magnesium + Apigenin | A | 3g + 400mg + 50mg | See Sleep Supplements Guide |
| Antibiotic recovery | S. boulardii + L. rhamnosus GG | A | 500mg 2x/d + 20B CFU/d | Start Day 1 with antibiotics |
| IBS bloating | PHGG (Sunfiber®) + B. longum 35624 | B | 5g/d + 1B CFU/d | See Gut Supplements Guide |
| Joint pain (osteoarthritis) | UC-II® collagen + Curcumin (Meriva®) | B | 40mg + 500mg 2x/d | Better than glucosamine/chondroitin |
| Testosterone (low/normal) | Zinc (if deficient) + D3 + Sleep + Training | B/C | Zinc 30mg, D3 5000 IU | No “test booster” blends work |
| Cognitive enhancement | Caffeine + L-Theanine + Creatine | B | 100mg + 200mg + 5g | Skip nootropic blends |
| Blood sugar support | Berberine + Chromium + Magnesium | B | Berberine 500mg 3x/d | Monitor; drug interactions |
Grade D/F: Popular But Ineffective or Harmful
| Supplement / Category | Why It Fails | Better Alternative |
|---|---|---|
| Testosterone “boosters” (Tribulus, Fenugreek, DAA, etc.) | No RCT shows >5% T increase in healthy men; marketing > science | Sleep 8h, lift heavy, D3 5000 IU, Zinc if deficient, lose visceral fat |
| BCAAs (isolated) | All 3 EAAs needed for MPS; whey/food superior; expensive urine | Whey protein or EAA blend (all 9) |
| Glutamine (for muscle/gut) | No benefit in fed humans; gut uses it but dietary protein sufficient | Protein 1.6–2.4g/kg; PHGG for gut |
| CLA (Conjugated Linoleic Acid) | 0.1kg fat loss/week (trivial); insulin resistance risk at high dose | Caffeine + calorie deficit + resistance training |
| Garcinia Cambogia / HCA | Meta-analyses: no significant weight loss vs. placebo | Protein + fiber + deficit |
| Raspberry Ketones | Zero human RCTs; rodent doses = impossible human equivalent | Don’t exist |
| “Detox” / “Cleanse” teas | Senna = stimulant laxative; causes dependency, not detox | Liver/kidneys detox you for free; eat fiber, hydrate |
| Proprietary “blends” (energy, pump, focus, fat burner) | Hide underdosing; you pay for pixie dust | Buy single ingredients at effective doses |
| Soil-Based Organisms (SBOs) / Spore probiotics | No advantage over Lacto/Bifido; safety concerns (bacteremia) | L. rhamnosus GG, S. boulardii, B. longum 35624 |
| Collagen for “skin/hair/nails/joints” | Hydrolyzed protein; no RCT shows benefit > whey for these outcomes | Whey + Vitamin C (for collagen synthesis) + resistance training |
| HMB (β-Hydroxy β-Methylbutyrate) | Only works in untrained/elderly; trained = no added benefit over protein | Creatine + Protein + Progressive Overload |
How to Read a Supplement Label (Red Flags)
- Proprietary Blend: “Energy Matrix 500mg” — you don’t know doses. Avoid.
- Pixie Dusting: Expensive ingredient listed but dose <10% effective amount.
- Fairy Dusting: 20+ ingredients — none at effective dose.
- No Third-Party Seal: NSF, USP, Informed Sport, ConsumerLab. If absent → trust me blind.
- Structure/Function Claims: “Supports healthy…” = legal loophole, not proof.
- Serving Size Games: “2 scoops = 1 serving” to halve apparent cost.
- Expiration Date Missing: Probiotics, fish oil, creatine degrade.
Quality Tiers: What to Buy
| Tier | Criteria | Example Brands | Price Premium |
|---|---|---|---|
| Pharmaceutical / NSF Sport | NSF Certified for Sport / Informed Sport; lot testing; banned substance screened | Klean Athlete, Thorne NSF, Momentous, Legion (some), DotFit | 2–3x |
| Clinical / Practitioner | USP Verified; cGMP; CoA available; professional distribution | Thorne, Pure Encapsulations, Designs for Health, Seeking Health, Integrative Therapeutics | 1.5–2x |
| Consumer Transparent | Full label disclosure; third-party tested (ConsumerLab, Labdoor); no proprietary blends | Legion, Transparent Labs, Bulk Supplements, NOW (some), Jarrow, Nutricost | Baseline |
| Avoid | Proprietary blends; no testing; MLM; “doctor formulated” without data; Amazon-only brands | Most grocery store brands, MLMs (Organifi, Beachbody, Isagenix), “proprietary blend” pre-workouts | — |
Navigation: Deep Dive Guides
Category-Specific Evidence Guides:
- Protein Powder: → Protein Powder Buying Guide (Whey, Casein, Plant — Lab Testing, Value)
- Creatine: → Creatine Guide: Forms, Dosing, Loading, Myths, Brand Comparison
- Magnesium: → Magnesium Guide: Forms (Glycinate, Threonate, Citrate), Uses, Brands
- Omega-3: → Omega-3 Guide: EPA/DHA Ratios, Oxidation Testing, Brand Rankings
- Vitamin D3/K2: → Vitamin D3/K2: Testing, Dosing, Cofactors, Brand Comparison
- Probiotics: → Probiotic Guide: Strains for Conditions, CFU, Survivability, Brands
- Prebiotics/Fiber: → Prebiotic/Fiber Supplements: Inulin, PHGG, Acacia, Resistant Starch
- Nootropics: → Nootropics Matrix: Ingredients, Evidence, Stacks, Safety
- Sleep Supplements: → Sleep Supplements Evidence Guide
- Gut Supplements: → Gut Supplements: Evidence Grades A–F
- Weight Loss Supplements: → Weight Loss Supplements Evidence Guide
- Joint Health: → Joint Supplements: Glucosamine, Chondroitin, MSM, Curcumin, UC-II — Evidence
- Cognitive Health: → Cognitive Supplements: Lion’s Mane, Bacopa, Phosphatidylserine, CDP-Choline
- Blood Sugar: → Blood Sugar Supplements: Berberine, Chromium, Cinnamon, Gymnema
- Testosterone Support: → Testosterone Support: Evidence Review, What Works, What’s Marketing
- Women’s Health: → Women’s Health: Iron, B-Complex, Folate, Choline, Prenatal — Forms & Brands
- Budget Supplements: → Budget Supplements: High Value, Third-Party Tested, Cost per Serving
- Supplement Safety: → Supplement Safety: Interactions, Contraindications, Quality Red Flags
References
- Kreider RB, et al. “ISSN Position Stand: Safety and Efficacy of Creatine Supplementation.” J Int Soc Sports Nutr. 2017;14:18.
- Guest NS, et al. “ISSN Position Stand: Caffeine and Exercise Performance.” J Int Soc Sports Nutr. 2021;18(1):1.
- Saunders B, et al. “Beta-Alanine Supplementation.” Br J Sports Med. 2017;51(8):658-669.
- Trexler ET, et al. “Citrulline Malate Supplementation.” J Strength Cond Res. 2019;33(5):1289-1297.
- Office of Dietary Supplements. “Dietary Supplement Fact Sheets.” NIH. 2024.
- ConsumerLab. “Supplement Reviews.” 2024.
- NSF International. “NSF Certified for Sport.” 2024.
