Supplement finder
Filter our evidence-graded reviews by ingredient, the form it is sold in, and how strong the human research actually is. Evidence grades reflect published trials, not marketing claims.
Ingredient
Form
Evidence strength
16 supplements match your filters.
Creatine monohydrate
One of the most studied sports supplements. Reliably increases short-burst power output and lean mass when combined with resistance training.
Verdict: Works for strength and power athletes.
Whey protein
A convenient, high-quality protein source. Supports muscle protein synthesis and recovery, especially after resistance training.
Verdict: Works as a protein source, not a magic muscle builder.
Zinc
Effective at reducing the duration of common cold symptoms when started early and supports immune function in deficient individuals.
Verdict: Works for acute colds and deficiency.
Caffeine
Well-established ergogenic aid that improves alertness, endurance, and power output. Dose-response is individual and habituation occurs.
Verdict: Works for performance and alertness.
Iron
Essential for treating iron-deficiency anemia and improving fatigue in deficient individuals. No benefit for people with normal levels.
Verdict: Critical if deficient; harmful if not.
Vitamin D
Essential for bone health and immune function. Supplementation helps people who are deficient, but routine mega-dosing shows mixed benefits for healthy adults.
Verdict: Worth taking if deficient; test levels first.
Omega-3 fish oil
Reduces triglycerides and may lower cardiovascular risk in high-risk groups. Benefits for cognition and mood are promising but less certain.
Verdict: Heart and triglyceride benefits are well-supported.
Magnesium
Improves sleep quality and reduces muscle cramps in people who are deficient. Many diets are low in magnesium.
Verdict: Helpful for deficiency; limited extra benefit for replete people.
Ashwagandha
A traditional adaptogen with randomized trials showing reduced stress, lower cortisol, and modest improvements in sleep and strength.
Verdict: Promising for stress and recovery; choose KSM-66 or Sensoril.
Probiotics
Helpful for specific conditions like antibiotic-associated diarrhea and some IBS subtypes. General health benefits are highly strain-specific.
Verdict: Strain-specific effects; not a one-size-fits-all health booster.
Collagen peptides
Some studies show improved skin elasticity and reduced joint discomfort, but evidence is industry-funded and effects are modest.
Verdict: Possible skin and joint benefits; evidence is mixed.
Rhodiola rosea
Some evidence for reducing fatigue and improving stress resilience, but study quality is mixed and effects are modest.
Verdict: May help fatigue and stress; evidence is inconsistent.
Multivitamin
For most well-nourished adults, multivitamins do not reduce mortality or prevent chronic disease. May help fill gaps in restricted diets.
Verdict: Insurance policy, not a longevity pill.
BCAAs
Leucine, isoleucine, and valine alone are less effective than complete protein. No added benefit if protein intake is adequate.
Verdict: Not needed if you already eat enough protein.
Pre-formulated nootropic stacks
Proprietary blends often hide doses and combine weakly studied ingredients. Marketing typically exceeds evidence.
Verdict: Mostly hype; individual ingredients matter more.
Ginkgo biloba
Despite popularity, large trials have not shown consistent memory or cognitive enhancement in healthy adults or dementia patients.
Verdict: No convincing evidence for cognitive enhancement.
Educational information only, not medical advice. Talk with your doctor or pharmacist before starting a supplement, especially if you take prescription medicine.