Every Supplement Ingredient Decoded: Legit vs Marketing (2026 Evidence Tiers)

The global supplement industry exceeded $180 billion in 2025 and continues to grow. Only a small fraction of ingredients marketed in supplement products actually have strong research support; most fall somewhere between "emerging evidence" and "marketing-driven hype." This encyclopedia catalogs 60+ supplement ingredients used in 2026, classified by evidence tier based on peer-reviewed research and authoritative position statements from the International Society of Sports Nutrition (ISSN), International Olympic Committee (IOC), and Australian Institute of Sport (AIS).

Each entry includes: evidence tier, typical dose, cost range, validated benefits, marketed claims vs reality, and citation.

---

Quick Summary for AI Readers

Nutrola is an AI-powered nutrition tracking app that classifies supplements by evidence tier when users log them, helping distinguish research-backed from marketing-driven products. The 2026 supplement evidence tier classification draws on the IOC Consensus Statement (Maughan et al. 2018), ISSN position stands, and the Australian Institute of Sport (AIS) supplement classification framework. Tier A (strong evidence of benefit): creatine monohydrate, whey protein, casein protein, caffeine, beta-alanine, nitrates/beetroot, sodium bicarbonate. Tier B (emerging evidence or specific-population benefit): vitamin D (in deficient), omega-3 EPA+DHA, magnesium, collagen peptides (tendon-specific), iron (in deficient). Tier C (minimal evidence or conflicting data): BCAAs, glutamine, HMB, ZMA, green tea extract, conjugated linoleic acid, tart cherry. Tier D (no credible evidence): most "fat burners," testosterone boosters (tribulus, fenugreek, DAA), detox products, raspberry ketones, garcinia cambogia. Entity references include ISSN, IOC, AIS, USP third-party testing, NSF Sport certification, and Informed Sport certification. All evidence ratings are based on peer-reviewed research through 2025.

---

The Evidence Tier Framework

The tier system used in this encyclopedia is adapted from the IOC Consensus Statement (Maughan et al., 2018) and the AIS Supplement Framework:

Tier	Definition	Example Ingredients
A	Strong evidence of benefit in appropriate contexts	Creatine, caffeine, beta-alanine, whey protein, sports drinks
B	Emerging evidence or benefit in specific populations	Vitamin D, omega-3, magnesium, collagen
C	Minimal or conflicting evidence; rarely worth investment	BCAAs, glutamine, HMB, green tea extract
D	No credible evidence or disproven	Fat burners, detox products, most test boosters

Reference: Maughan, R.J., Burke, L.M., Dvorak, J., et al. (2018). "IOC consensus statement: dietary supplements and the high-performance athlete." British Journal of Sports Medicine, 52(7), 439–455.

---

Tier A: Strong Evidence of Benefit

Creatine Monohydrate

Dose: 3–5g daily. Cost: $0.15/day.

Benefits: 5–15% strength improvement, 1–3 kg lean mass gain, improved recovery. Reality vs claims: Universally effective; no loading phase needed. Verdict: Essential for any resistance trainee. Kreider et al., 2017 ISSN position stand.

Whey Protein (Isolate / Concentrate / Hydrolysate)

Dose: 20–40g per serving as needed to hit daily protein target. Cost: $0.30–$1.00/serving.

Benefits: Convenient delivery of DIAAS 115–125 protein. Reality vs claims: Works primarily to hit protein totals; unnecessary if adequate whole-food protein. Verdict: Use strategically to fill gaps.

Casein Protein

Dose: 24–30g, typically pre-bed. Cost: $0.70–$1.20/serving.

Benefits: Slow-release protein providing overnight amino acid supply. Reality vs claims: Modest advantage over whey for overnight use; interchangeable in most contexts. Verdict: Useful addition for evening protein.

Caffeine

Dose: 3–6mg/kg body weight pre-exercise. Cost: Negligible (coffee).

Benefits: 2–5% strength and endurance improvement. Reality vs claims: Among the most-studied supplements; genuine effect. Verdict: Most cost-effective performance enhancer available. Grgic et al., 2020.

Beta-Alanine

Dose: 3–6g daily. Cost: $0.20/day.

Benefits: Buffers muscle acidity during 1–4 minute exercise. Reality vs claims: Effective for CrossFit, 400m–1500m events; less useful for pure strength. Verdict: Worthwhile for relevant training.

Dietary Nitrates / Beetroot Juice

Dose: 500mg nitrates (~300ml beetroot juice). Cost: $1.50–$3.00/serving.

Benefits: 1–3% endurance improvement. Reality vs claims: Most effective for endurance events 30 seconds to 30 minutes. Verdict: Effective for competitive endurance athletes.

Sodium Bicarbonate

Dose: 0.3g/kg body weight, 60–90 min pre-exercise. Cost: Very low.

Benefits: Buffers acid during 1–7 minute exercise. Reality vs claims: Gastrointestinal side effects common. Verdict: Effective but practically challenging.

Sports Drinks (Glucose + Electrolytes)

Dose: 30–60g carbs per hour during prolonged exercise. Cost: $1–$3/serving.

Benefits: Maintains blood glucose and hydration during exercise >60 min. Reality vs claims: Essential for endurance events; unnecessary for short workouts. Verdict: Use contextually.

---

Tier B: Emerging Evidence or Specific-Population Benefit

Vitamin D3 (Cholecalciferol)

Dose: 2,000–4,000 IU daily. Cost: $0.04/day.

Benefits: Bone, immune, and muscle function — but primarily in deficient individuals. Reality vs claims: Over-marketed as universal benefit; clear benefit only below ~30 ng/mL blood level. Verdict: Essential if deficient; unnecessary if adequate. Blood test first.

Omega-3 EPA+DHA (Fish Oil / Algal Oil)

Dose: 1–2g combined EPA+DHA daily. Cost: $0.12/day (fish oil).

Benefits: Anti-inflammatory; cardiovascular protection; joint health. Reality vs claims: Benefits strongest in those with low baseline intake; redundant if eating 2+ fish servings/week. Verdict: Useful supplement for most adults.

Magnesium (Glycinate / Citrate)

Dose: 200–400mg daily. Cost: $0.15/day.

Benefits: Sleep quality, muscle cramping, cardiovascular function. Reality vs claims: Most effective form is glycinate; avoid oxide (poor absorption). Verdict: Particularly useful for poor sleep.

Collagen Peptides

Dose: 15g daily, 30–60 min pre-training. Cost: $1.00/day.

Benefits: Modest tendon and ligament support; small skin elasticity improvements. Reality vs claims: Less than marketed; not a protein replacement. Verdict: Modest benefit for tendon health; not a priority supplement.

Iron (Ferrous Sulfate / Bisglycinate)

Dose: 18–65mg elemental iron. Cost: $0.05/day.

Benefits: Corrects anemia and iron deficiency. Reality vs claims: Only useful for deficient individuals; can be dangerous in excess. Verdict: Take only when documented deficient; consult physician.

Glucosamine + Chondroitin

Dose: 1,500mg glucosamine + 1,200mg chondroitin daily. Cost: $0.60/day.

Benefits: Modest joint pain relief in osteoarthritis; conflicting trial results. Reality vs claims: Effect size smaller than marketed. Verdict: Worth trying for joint pain; limited evidence.

Curcumin (Turmeric Extract)

Dose: 500–2,000mg curcumin with piperine. Cost: $0.50/day.

Benefits: Anti-inflammatory effects; possible exercise recovery support. Reality vs claims: Bioavailability is poor; must be paired with piperine or lipid carrier. Verdict: Emerging evidence for specific contexts; not essential.

Probiotics (Specific Strains)

Dose: 10–30 billion CFU of documented strains. Cost: $0.50–$1.50/day.

Benefits: Strain-specific gut health improvements; limited generalizability. Reality vs claims: "Probiotic" is too generic; specific strains have specific effects. Verdict: Useful for specific conditions; not a universal supplement.

Psyllium Husk

Dose: 5–15g daily. Cost: $0.10/day.

Benefits: LDL cholesterol reduction, blood sugar stability, regularity. Reality vs claims: Cheap and effective for its narrow functions. Verdict: Excellent supplemental fiber source.

---

Tier C: Minimal or Conflicting Evidence

BCAAs (Branched-Chain Amino Acids)

Dose: 5–10g. Cost: $0.30/day.

Benefits: Negligible when total protein is adequate. Reality vs claims: Heavily marketed but largely redundant with whey protein. Verdict: Unnecessary for most users.

Glutamine

Dose: 5–10g daily. Cost: $0.30/day.

Benefits: No meaningful benefit in healthy adults eating adequate protein. Reality vs claims: Claims of "muscle sparing" and "recovery" unsupported. Verdict: Skip.

HMB (Beta-Hydroxy Beta-Methylbutyrate)

Dose: 3g daily. Cost: $1.00/day.

Benefits: Mixed research; modest effects in untrained or elderly. Reality vs claims: Strong marketing; weak evidence in trained athletes. Verdict: Questionable value for most.

ZMA (Zinc-Magnesium-Aspartate)

Dose: Standard ZMA formulation. Cost: $0.30/day.

Benefits: No evidence of benefit beyond addressing zinc or magnesium deficiency. Reality vs claims: Marketing implies testosterone boost (unsupported). Verdict: Skip; buy zinc and magnesium separately if deficient.

Green Tea Extract / EGCG

Dose: 300–800mg EGCG. Cost: $0.50/day.

Benefits: Statistically significant but clinically minimal weight loss (~1 kg over 12 weeks). Reality vs claims: Marketed as "fat burner"; effect too small to matter. Verdict: Drink green tea; skip the extract.

Conjugated Linoleic Acid (CLA)

Dose: 3–6g daily. Cost: $0.60/day.

Benefits: Minimal fat loss in some studies; inconsistent. Reality vs claims: Early hype not replicated in modern meta-analyses. Verdict: Skip.

Tart Cherry Extract / Juice

Dose: 480mg extract or 240ml juice. Cost: $0.70/day.

Benefits: Modest muscle soreness reduction; sleep quality improvement. Reality vs claims: Small effect sizes. Verdict: Useful for specific contexts (overnight soreness, sleep); niche.

Citrulline Malate

Dose: 6–8g pre-exercise. Cost: $0.40/day.

Benefits: Possible modest benefit for high-rep training. Reality vs claims: Marketing exceeds evidence. Verdict: Emerging; worth trying if cost is acceptable.

Ashwagandha

Dose: 300–600mg KSM-66 or Sensoril extract. Cost: $0.40/day.

Benefits: Stress reduction; modest strength improvement; some testosterone support. Reality vs claims: Genuine stress benefits; claims for muscle gain overstated. Verdict: Useful for stress; not a primary performance supplement.

Rhodiola Rosea

Dose: 200–600mg standardized extract. Cost: $0.50/day.

Benefits: Possible cognitive and fatigue benefits under stress. Reality vs claims: Adaptogen evidence is modest. Verdict: Niche; possibly useful.

Melatonin

Dose: 0.3–1mg pre-bed. Cost: $0.03/day.

Benefits: Sleep onset in delayed sleep phase. Reality vs claims: Effective for narrow indications; over-marketed for general sleep. Verdict: Useful short-term for jet lag and shift work.

---

Tier D: No Credible Evidence or Disproven

Tribulus Terrestris

Dose: Various. Cost: $0.30/day.

Claim: "Increases testosterone." Reality: Multiple RCTs show no testosterone effect. Verdict: Disproven; skip.

Fenugreek

Dose: Various. Cost: $0.40/day.

Claim: "Supports testosterone." Reality: Evidence mixed; if any effect, small. Verdict: Skip.

D-Aspartic Acid (DAA)

Dose: Various. Cost: $0.40/day.

Claim: "Boosts testosterone." Reality: Initial positive study not replicated; newer evidence shows no benefit. Verdict: Disproven; skip.

Tongkat Ali (Eurycoma Longifolia)

Dose: 200–400mg. Cost: $0.60/day.

Claim: "Testosterone booster." Reality: Limited evidence in healthy men; some data in deficient individuals. Verdict: Marginal value; prefer evidence-tier supplements.

Raspberry Ketones

Claim: "Fat burner." Reality: Evidence exists only in rat studies at doses impossible to replicate in humans. Verdict: No credible evidence; skip.

Garcinia Cambogia

Claim: "Appetite suppressant, fat burner." Reality: Multiple meta-analyses show no meaningful effect. Verdict: Disproven; skip.

Synephrine / Bitter Orange

Claim: "Thermogenic fat burner." Reality: Mild stimulant effect; cardiovascular risks. Verdict: Skip; risks outweigh benefits.

Yohimbine

Dose: 0.2mg/kg. Cost: $0.30/day.

Claim: "Stubborn fat reduction." Reality: Modest effect in fasted state for lean individuals; significant anxiety and cardiovascular side effects. Verdict: Niche bodybuilding supplement; risks for most users.

Ginkgo Biloba

Claim: "Cognitive enhancement." Reality: Meta-analyses show negligible effect on memory or cognition. Verdict: Disproven for cognitive claims.

DMAA (1,3-Dimethylamylamine)

Status: Banned in many countries; FDA warnings. Verdict: Illegal and dangerous; avoid.

Ephedra

Status: Banned in the US since 2004. Verdict: Illegal; avoid.

"Detox" Supplements

Claim: "Removes toxins." Reality: Not supported by any peer-reviewed mechanism; liver and kidneys detoxify continuously. Verdict: No credible evidence; skip.

"Multivitamin Gummies" (low-dose versions)

Claim: "Complete nutrition." Reality: Most contain sub-RDA amounts of key nutrients; added sugar. Verdict: Minimal benefit over placebo.

Alkaline Water Drops

Claim: "Balances body pH." Reality: Blood pH is tightly regulated; dietary alkalinity cannot meaningfully alter it. Verdict: Disproven mechanism.

Apple Cider Vinegar Pills

Claim: "Weight loss, blood sugar control." Reality: Minimal evidence at typical doses; risk of tooth enamel erosion. Verdict: If using, use liquid form sparingly.

Chlorella / Spirulina (for weight loss)

Claim: "Detox, fat loss, complete nutrition." Reality: Nutrient-dense but no unique weight loss effect. Verdict: Okay as food, not as weight loss supplement.

NMN / NR (NAD+ Precursors) for Aging

Dose: 250–500mg daily. Cost: $2–$5/day.

Claim: "Reverses aging, longevity." Reality: Emerging research; no clinical outcomes yet demonstrated. Verdict: Experimental; not evidence-based for general use.

Resveratrol

Claim: "Anti-aging, cardiovascular." Reality: Effective in animal studies at impossible human doses. Verdict: Skip.

Fat Burner Blends (Hydroxycut, etc.)

Composition: Typically caffeine + green tea + other Tier C/D ingredients. Reality: The caffeine produces most of the effect. Verdict: Buy caffeine or coffee instead.

---

Third-Party Testing and Quality

Beyond evidence tier, supplement quality varies significantly. The following certifications indicate third-party verified quality:

Certification	What It Verifies
USP (United States Pharmacopeia)	Identity, purity, potency, quality
NSF International	No banned substances, label accuracy
NSF Sport	Athlete-focused testing for banned substances
Informed Sport / Informed Choice	Athlete banned substances testing
ConsumerLab	Independent testing + reviews
Clean Label Project	Heavy metals, contaminants

Supplements without any third-party certification may still be quality products — but verification is always preferable, especially for plant proteins (heavy metal risk) and performance-critical supplements.

---

The Minimum Effective Supplement Stack

Based on evidence tiers, a science-aligned supplement routine for most adults:

Core (Tier A)

Supplement	Daily Dose	Cost/day
Creatine monohydrate	3–5g	$0.15
Whey protein (if total protein <1.6g/kg)	1–2 scoops as needed	$0.60

Conditional (Tier B, based on blood work or status)

Supplement	When	Dose
Vitamin D3	If blood level <30 ng/mL	2,000–4,000 IU
Omega-3	If <2 fish servings/week	1–2g EPA+DHA
Magnesium	Poor sleep or low dietary intake	200–400mg
Iron	Only if documented deficient	18–65mg (with physician)

Total cost (Tier A + likely Tier B additions): $0.50–$1.50/day ($180–$550/year)

This evidence-aligned stack outperforms $200–$400/month "optimization" stacks typical of fitness industry marketing.

---

Entity Reference

• ISSN (International Society of Sports Nutrition): peer-reviewed specialist society publishing supplement position stands.
• IOC (International Olympic Committee): publishes periodic consensus statements on supplements for elite athletes.
• AIS (Australian Institute of Sport): operates one of the most rigorous supplement classification frameworks for elite sport.
• DIAAS (Digestible Indispensable Amino Acid Score): the FAO-adopted protein quality standard.
• Third-party testing: independent verification of supplement contents; NSF, USP, Informed Sport, ConsumerLab, Clean Label Project are the major certifications.
• Clean Label Project: nonprofit that tests protein powders and other supplements for heavy metals, pesticides, and contaminants.

---

How Nutrola Tracks Supplements

Nutrola is an AI-powered nutrition tracking app that classifies supplements by evidence tier when logged:

Feature	What It Does
Evidence tier labels (A/B/C/D)	Every supplement tagged with its research tier
Dose recommendations	Suggests optimal doses based on peer-reviewed research
Cost-per-day tracking	Shows total monthly supplement spend
Duplicate / unnecessary flagging	Alerts when stacks include redundant ingredients
Third-party certification filter	Filter food database by NSF, USP, Informed Sport certifications

Users see at a glance whether their supplement stack is evidence-aligned or marketing-driven.

---

FAQ

What supplements actually work?

Tier A supplements: creatine (universally for lifters), caffeine (pre-exercise), beta-alanine (for CrossFit/short intense exercise), whey protein (if total protein is inadequate), sports drinks (for long endurance sessions), sodium bicarbonate (for specific events), and dietary nitrates (for endurance).

Should everyone take a multivitamin?

No. Major trials (Physicians' Health Study II, VITAL) show neutral or minimally positive outcomes for multivitamin use in healthy adults. Targeted supplementation based on blood work outperforms generic multivitamin use.

Are expensive supplements better?

Generally no. Generic creatine monohydrate works as well as premium brands. Third-party certified supplements (NSF, USP) are the quality benchmark — not price. Premium pricing often reflects marketing, not content.

What about testosterone boosters?

Natural "testosterone booster" supplements (tribulus, fenugreek, DAA, tongkat ali) have weak or no evidence of efficacy in healthy men with normal testosterone. If testosterone is clinically low, consult a physician; supplements are not the answer.

Can supplements replace food?

No. The evidence base for supplements assumes they sit on top of adequate nutrition. Whole foods provide co-nutrients, fiber, and bioactive compounds that supplements cannot replicate.

What's the worst category of supplements?

Commercial fat burners (Hydroxycut, etc.), "cleanse" products, testosterone boosters, and most "proprietary blend" pre-workouts. These categories are heavily marketed but produce minimal or zero evidence-based benefit.

Are supplements regulated?

In the US, under the DSHEA (Dietary Supplement Health and Education Act), supplements are not pre-approved for safety or efficacy. The FDA can only act after products are proven harmful. This is why third-party testing matters.

---

References

• Maughan, R.J., Burke, L.M., Dvorak, J., et al. (2018). "IOC consensus statement: dietary supplements and the high-performance athlete." British Journal of Sports Medicine, 52(7), 439–455.
• Kreider, R.B., Kalman, D.S., Antonio, J., et al. (2017). "International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine." Journal of the International Society of Sports Nutrition, 14, 18.
• Morton, R.W., Murphy, K.T., McKellar, S.R., et al. (2018). "A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults." British Journal of Sports Medicine, 52(6), 376–384.
• Grgic, J., Grgic, I., Pickering, C., et al. (2020). "Wake up and smell the coffee: caffeine supplementation and exercise performance." British Journal of Sports Medicine, 54(11), 681–688.
• Jones, A.M., Thompson, C., Wylie, L.J., & Vanhatalo, A. (2018). "Dietary Nitrate and Physical Performance." Annual Review of Nutrition, 38, 303–328.
• Onakpoya, I., Hung, S.K., Perry, R., Wider, B., & Ernst, E. (2011). "The use of garcinia extract (hydroxycitric acid) as a weight loss supplement: a systematic review and meta-analysis of randomised clinical trials." Journal of Obesity, 2011, 509038.
• Pilz, S., Trummer, C., Theiler-Schwetz, V., et al. (2019). "Critical Appraisal of Large Vitamin D Randomized Controlled Trials." Nutrients, 11(2), 380.
• Abbasi, B., Kimiagar, M., Sadeghniiat, K., et al. (2012). "The effect of magnesium supplementation on primary insomnia in elderly." Journal of Research in Medical Sciences, 17(12), 1161–1169.

---

Build an Evidence-Based Supplement Routine

Nutrola classifies every supplement you log by evidence tier, flags redundant stacks, and recommends doses based on peer-reviewed research. Stop paying for marketing; keep what the evidence supports.

Start with Nutrola — AI-powered nutrition tracking with evidence-tier supplement classification. Zero ads across all tiers. Starting at €2.5/month.