13 Top 10s. 130 Supplements. The Complete Discover-Page Cheat Sheet.

One perfect score. One supplement that permanently turns skin blue. One $5 capsule with more clinical evidence than every $1,500-a-month IV drip combined. We've mined 27,000+ peer-reviewed studies and 733 supplements into 13 Top 10 lists on our Discover page — the safest, the most dangerous, the most overhyped, the cheapest effective, and seven more. Here is every list, every entry, in one scrollable page.

1.Top 10 Safest Supplements

The ones you could hand a stranger on the street without a second thought. Wide therapeutic windows, decades of human data, and tox profiles so clean that #1 is the only perfect score in the entire database.

1. Oral rehydration salts (WHO formula) — Score 100/100. WHO/UNICEF call it the most cost-effective intervention in modern medicine.
2. Electrolyte replacement (clinical) — Same evidence base as ORS, formulated for adults.
3. Creatine monohydrate — 500+ trials. ISSN's 2017 position stand: safe at 3–5 g/day.
4. Psyllium husk — Cochrane review of 28 RCTs and an FDA-authorized heart-health claim at 7 g/day.
5. Oat beta-glucan — 58 RCTs, N=3,974, LDL down 5–10% at 3 g/day. FDA-approved cholesterol claim.
6. Protein supplementation (sarcopenia) — PROT-AGE consensus: 1.2–1.6 g/kg/day in older adults.
7. Lactase enzyme — Cochrane-confirmed for lactose intolerance. Doesn't enter the bloodstream.
8. Vitamin B1 (Thiamine, clinical) — Life-saving in alcohol-use disorder. No documented chronic toxicity.
9. L-Leucine (standalone) — 2.5–3 g triggers muscle protein synthesis via mTOR.
10. Melatonin (0.1–0.5 mg, physiological) — Matches natural nighttime peaks without next-day grogginess.

2.Top 10 Most Dangerous

Documented liver failure, kidney damage, cancer, or deaths. Several of these are still legally sold in the United States.

1. Greater celandine (Chelidonium majus) — Pulled in Germany in 2008 after a benefit-risk review of liver-injury cases. Score 22/100 — the lowest in the database.
2. Aristolochic acid — IARC Group 1 carcinogen. Causes Balkan endemic nephropathy and urothelial cancer.
3. Usnic acid — Banned in fat-burners after liver transplants and deaths.
4. Calomel (mercurous chloride) — Mercury toxicity. Still found in some traditional preparations.
5. Comfrey (oral) — Pyrrolizidine alkaloids cause veno-occlusive liver disease.
6. Cesium chloride — Marketed as an "alternative cancer cure." Causes fatal cardiac arrhythmias.
7. Germander — Pulled in France 1992 after acute hepatitis cluster. Still legal elsewhere.
8. Chaparral (Larrea tridentata) — FDA warning. Documented hepatotoxicity, including fulminant failure.
9. Pennyroyal oil — Lethal at common "abortifacient" doses. Liver and kidney failure.
10. Amanita muscaria — Yes, the red-and-white mushroom. Sold in gummies. Hallucinogenic and acutely toxic.

3.The Most-Studied Supplements on Earth

The supplements that have survived the most scrutiny. If something is going to fall apart under replication, it usually does it before it hits this list.

1. Creatine monohydrate — 500+ studies. Strength, recovery, and now cognition.
2. Omega-3 (EPA/DHA) — Meta-analyses pool 40,000+ people. REDUCE-IT: 25% drop in cardiac events at high-dose EPA.
3. Vitamin D3 — Hundreds of trials. The most-tested fat-soluble vitamin in modern medicine.
4. Caffeine (standardised) — The most-studied ergogenic aid in sports science, period.
5. Psyllium husk — 420 indexed trials and an FDA health claim.
6. Oat beta-glucan — Cochrane meta-analysis of 58 RCTs (N=3,974). LDL drops 5–10%.
7. Zinc — 2024 Cochrane review pooled 34 trials and 8,500+ people for cold/immune outcomes.
8. Melatonin — Hundreds of trials across sleep, jet lag, ICU delirium, even chemo-supportive care.
9. Oral rehydration salts — Decades of WHO data. Possibly the most-studied formulation in any pharmacy.
10. Whey protein — The most-trialled protein source in sports nutrition.

4.Most Overhyped of 2026

Some of these have huge marketing budgets. Some have a single positive study. None have the evidence base their packaging implies.

1. Sea moss (Irish moss) — Heavy-metal contamination is the actual story. Independent assays repeatedly find lead, mercury, and arsenic above safety thresholds.
2. Turkesterone / Ecdysteroids — Two 2024–25 RCTs (Smith and Wilborn): no effect on muscle, strength, or body fat.
3. Fadogia agrestis — Zero human trials. Animal studies flagged testicular toxicity.
4. Shilajit (Mumie) — 2023 Indian government test of 73 retail samples: ~40% exceeded permissible heavy-metal limits.
5. Tongkat ali — 2024 RCT (n=109): no measurable change in testosterone, libido, or strength vs placebo.
6. NMN / NAD+ precursors — Reliably raise blood NAD+. The 2025 Prokopidis meta-analysis found no functional gains.
7. Spermidine — Entire human longevity evidence base is a single 60-person pilot.
8. Urolithin A — One published 2024 trial. ~$60/month for the proprietary brand.
9. Lion's mane mushroom — 2025 acute crossover RCT in young adults: no cognitive or mood benefit on standardised tests.
10. Apigenin — Popularised by longevity influencers at 50–100 mg/day. Dose-response not characterised in humans.

5.Hidden Gems No One Markets

The flip side of "most overhyped." These don't have marketing departments because they're off-patent. They do have decades of data.

1. Oral rehydration salts — The cheapest perfect-score supplement on Earth. Cents per serving.
2. Riboflavin (B2, 400 mg/day) — Cochrane: prevents about 2 migraine days per month. Costs pennies.
3. Melatonin (0.1–0.5 mg micro-dose) — Quietly outperforms the 5–10 mg "knockout" gummies.
4. Sodium bicarbonate (sports) — Possibly the cheapest legal ergogenic in existence.
5. L-Carnitine — 40 years of cardiac and fertility data. Almost never advertised — it's off-patent.
6. Glycine (3 g pre-bed) — Improves measurable sleep quality. Tastes mildly sweet. Costs almost nothing.
7. Niacinamide (3,000 mg/day) — Matches NSAIDs for knee osteoarthritis. Beats glucosamine head-to-head.
8. Lactoferrin — Raises haemoglobin like ferrous sulphate, with virtually none of the GI upset.
9. Boswellia serrata — Topped a 2025 network meta-analysis of supplements for knee OA.
10. Calcium alpha-ketoglutarate (Ca-AKG) — Serum AKG drops 10× from age 30 to 80. Quietly one of the most interesting longevity compounds.

6.By Goal: What to Actually Take

Not strictly a Top 10 — six goals × four picks = 24 evidence-led shortlists. Tier 1 / 2 only, no trending wishful thinking.

• Sleep — Magnesium glycinate 200–400 mg, glycine 3 g pre-bed, melatonin 0.1–0.5 mg, L-theanine 200 mg.
• Focus — Caffeine + L-theanine 100/200 mg, creatine 3–5 g, omega-3 1–2 g, rhodiola rosea 200–600 mg.
• Strength — Creatine 3–5 g, whey + leucine 20–40 g + 2.5 g, beta-alanine 3.2–6.4 g, sodium bicarbonate 0.3 g/kg pre-event.
• Heart — High-dose EPA 2–4 g, psyllium husk 7 g (FDA claim), oat beta-glucan 3 g, CoQ10 100–300 mg / K2 (MK-7) 90–180 µg.
• Immunity — Zinc lozenges 13–24 mg at onset, vitamin D3 1,000–4,000 IU, cranberry 500 mg PAC, L. rhamnosus GG 10 billion CFU.
• Healthy aging — Protein 1.2–1.6 g/kg, creatine 3–5 g, vitamin D3 1,000–2,000 IU, riboflavin 400 mg (migraines).

7.Things You Should Literally Never Do

1. Iron + a curious toddler — A single adult tablet can kill a child under 6.
2. Pediatric melatonin gummies, casually — Gummy doses vary 30–80% from label. ER visits up 530%.
3. St. John's Wort + an SSRI / SNRI — Risk of fatal serotonin syndrome. Same for 5-HTP + MAOI.
4. St. John's Wort + warfarin / OCP / chemo / HIV meds — A potent CYP3A4 inducer. Wipes drug levels.
5. Kava extract + alcohol or acetaminophen — Solvent-extracted kava is already hepatotoxic.
6. Vitamin K2 + warfarin — Direct antagonism. Never combine without anticoagulation supervision.
7. Vitamin E ≥ 400 IU/day, chronically — Cochrane: linked to increased all-cause mortality.
8. Vitamin A > 10,000 IU/day — Liver damage and severe birth defects.
9. Berberine on top of metformin / insulin — Additive hypoglycemia. Plus statin toxicity risk.
10. DMAA / DMHA "shred" pre-workouts — Heart attacks, seizures, BP spikes. They keep getting rebranded.
11. Yohimbe at fat-burner doses — ER admissions for arrhythmia and panic attacks.
12. Anything labelled "research chemical" — SARMs, tianeptine, phenibut. Unapproved drugs in supplement clothing.

8.Pregnancy: Take vs Avoid

Always confirm with your obstetrician — but these are the consistent regulatory positions on what's worth taking and what to skip.

Take (with clinician sign-off):

1. Folate (5-MTHF) — 600–800 µg.
2. Choline — 450 mg/day (AI). 90% of mothers fall short.
3. DHA (algal or fish) — 200–300 mg.
4. Vitamin D3 — 1,000–2,000 IU.
5. Iron (if deficient) — 27 mg (RDA).
6. Iodine (in prenatal) — 150 µg.
7. Prenatal multi (ACOG) — once daily.

Avoid:

1. Vitamin A retinol > 10,000 IU/day — teratogenic.
2. Kava (any form) — liver risk.
3. St. John's Wort — CYP3A4 induction.
4. Green tea extract (high) — folate antagonist.
5. Ashwagandha — abortifacient (theoretical).
6. Saw palmetto / Pygeum — hormonal.
7. Comfrey / coltsfoot — pyrrolizidine alkaloid toxicity.
8. Kratom, phenibut, tianeptine — unapproved.

9.Most Expensive vs Cheapest Effective

$5 of creatine has more clinical evidence behind it than every product on the right side of this list combined. Price ≠ evidence.

Cheap (Tier 1 evidence for ~$5/month):

1. Creatine monohydrate — ~$5
2. Psyllium husk — ~$6
3. Glycine — ~$5
4. Niacinamide — ~$4
5. Riboflavin (B2) — ~$4
6. Sodium bicarbonate — <$2
7. Oral rehydration salts — cents per serving
8. Melatonin 0.3 mg — ~$5

Pricey ($60–1,500/month, preliminary):

1. NAD+ IV (clinic) — $500–1,500/session
2. Ketone esters — $200+
3. NMN — $80–120
4. Nicotinamide riboside — $60–90
5. Akkermansia muciniphila — $60+
6. Urolithin A — $60+
7. Cycloastragenol (TA-65) — $200+
8. MOTS-c peptide — $200+

10.Supplements That Interact With the Most Prescription Drugs

Mined from the interactions matrix in our database. If you take any prescription, this is the list to scan first.

1. St. John's Wort — Warfarin, SSRIs, MAOIs, oral contraceptives, chemotherapy. The poster child for "natural ≠ inert."
2. Berberine — Statins, metformin, BP meds, diabetes drugs, antifungals.
3. Magnesium — Thyroid hormone, PPIs, antibiotics, benzos, sleep meds.
4. Omega-3 (high dose) — Bleeding risk on top of warfarin / DOACs / antiplatelets.
5. Ginkgo biloba — Antiplatelet, anticoagulant, and seizure-threshold concerns.
6. 5-HTP — SSRIs, MAOIs, triptans — serotonin syndrome risk.
7. Saffron — Antidepressants, blood thinners, blood-pressure meds.
8. Melatonin — Seizure meds, sedatives, benzos. Effects amplify rather than just stack.
9. Vitamin K2 — Warfarin antagonism. Even MK-7 doses can drop INR meaningfully.
10. Calcium / Iron / Zinc — Chelate fluoroquinolones, tetracyclines, levothyroxine, bisphosphonates. Separate doses by 2–4 hours.

11.Top 10 Supplements People Are Actually Deficient In

The supplements where pills genuinely fill a population-wide dietary hole. Most marketing dollars go elsewhere.

1. Potassium — Median U.S. intake is roughly 2,400–2,800 mg/day for men and 1,800–2,300 for women. Adequate Intake is 3,400 / 2,600. Essentially the entire population is short.
2. Fibre — ~95% of U.S. adults fall short of the 25–38 g/day target.
3. Choline — ~90% below the AI. Critical for liver, brain, and pregnancy.
4. Omega-3 (EPA + DHA) — ~90% of U.S. adults below AHA's 250 mg/day from seafood.
5. Vitamin K2 — No formal RDA, but ~75% of adults below intakes associated with cardiovascular and bone benefits.
6. Magnesium — ~50% of U.S. adults below the EAR (320 mg women / 420 mg men).
7. Vitamin D — ~42% of U.S. adults have serum 25(OH)D below 30 ng/mL.
8. Calcium — ~40% below the EAR (800–1,000 mg). Highest in adolescent girls and adults over 50.
9. Iron (women 19–50) — ~25% have low iron stores; ~10% meet criteria for iron-deficiency anemia.
10. Vitamin B12 (adults 50+) — ~20% of older adults have low or borderline B12, primarily from age-related stomach-acid decline.

12.Wild Fun Facts

1. 420 clinical trials on psyllium husk — plus an FDA-authorized coronary-heart-disease claim at 7 g/day.
2. 57% fewer cardiac deaths with dietary K2 — Rotterdam Study (n=4,807): high vs low menaquinone intake.
3. 43% reduction in major cardiac events with CoQ10 — Q-SYMBIO (n=420), 300 mg/day ubiquinone over two years.
4. 25% drop in cardiac events with high-dose EPA — REDUCE-IT (NEJM 2019, n=8,179) at 4 g/day icosapent ethyl.
5. 2 fewer migraine days/month with riboflavin — at 400 mg/day, per Cochrane.
6. 10× drop in alpha-ketoglutarate from age 30 to 80 — the basis for every Ca-AKG longevity product.
7. 19 supplements with documented hepatotoxicity — kava, green tea extract, usnic acid, Fo-Ti, greater celandine, comfrey, germander, chaparral, pennyroyal, coltsfoot, skullcap, ashwagandha (rare), high-dose A and E, SAMe, sea moss, CLA, black cohosh, schisandra.
8. The only perfect score in the database is oral rehydration salts. Next-highest scorer is 4 points behind.
9. The lowest score in the database is greater celandine — 22/100. 78 points behind the top.
10. Argyria is forever. Colloidal silver permanently turns skin blue-grey. Silver granules deposited in the dermis. There is no treatment.

13.Recent Recalls & FDA Warnings

Several of these are still legally on shelves through loopholes.

1. Ephedra (FDA, 2004) — pulled after 155 documented deaths. Bitter-orange synephrine moved into the space within months.
2. Kratom (FDA, ongoing) — 36 deaths in FDA review. Activates opioid receptors. Still sold in head shops.
3. Green-tea extract (EFSA, 2018) — ≥ 800 mg EGCG/day flagged as liver-toxic. Now the leading herbal cause of drug-induced liver injury in the U.S. registry.
4. Vinpocetine (FDA, 2020) — Final guidance: it's a drug, not a supplement. Not safe in pregnancy. Still sold under "nootropic" labels.
5. Melanotan II (case reports, 2023–24) — 3 published rapid-growth melanoma cases in users of injected "tanning peptides."
6. DMAA (FDA, 2013) — banned after deaths and cardiac events. Analogues (DMHA, octodrine, 2-aminoisoheptane) keep reappearing under new names.
7. Colloidal silver (FDA enforcement) — No safe or effective use. Argyria is irreversible.
8. Phenibut (clinical, ongoing) — Physical dependence in 3–5 days. Withdrawal includes seizures.
9. Tianeptine (state actions, ongoing) — "Gas station heroin." Banned in 11 U.S. states by 2024.
10. Greater celandine (BfArM, 2008) — Authorization withdrawn in Germany after liver-injury cluster. Still legal in the U.S.

So what's the takeaway?

Five things, really.

1. The most-evidenced supplement on Earth is the cheapest one. Oral rehydration salts. Pennies per serving. Perfect score.
2. The most dangerous supplements are still legally on shelves. Greater celandine, ephedra analogues, vinpocetine, kratom, tianeptine — all currently sold in the U.S.
3. The most overhyped category and the most underrated category share members. NMN sits on the overhyped list. Its long-known precursor (niacinamide) is in hidden gems.
4. Price tracks marketing, not evidence. $5 of creatine has more clinical support than $1,500 of NAD+ IVs.
5. Most "deficiency" marketing is aimed at the wrong nutrients. Multivitamins lead with C and E. The actual gaps are potassium, fibre, choline, omega-3, K2, magnesium, and D.