What's Really In Your Supplements?
Clinical evidence for every ingredient. No hype. No guesswork. Expert-reviewed and backed by peer-reviewed trials.
Research Library
Explore our comprehensive supplement research organized by health category.
Vitamins
Essential micronutrients your body needs for cellular function, immune defense, and energy metabolism.
Minerals
Inorganic elements critical for bone health, enzyme function, and nervous system regulation.
Brain Health
Nootropics and nutrients that support cognitive function, memory, and neuroprotection.
Joint & Bone Health
Compounds that protect cartilage, reduce joint stiffness, and support bone mineral density.
Gut Health
Probiotics, prebiotics, and compounds that support digestive function and the gut microbiome.
Sleep & Stress
Natural compounds that promote relaxation, sleep quality, and healthy stress response.
More Categories
Editor-Featured
Quality-verified supplements our team endorses
Mega Green Tea Extract (Decaffeinated)
Life ExtensionDelivers a potent 326mg EGCG per capsule from a 98% polyphenol standardized extract — one of the highest concentrations available. Decaffeinated, making it suitable for caffeine-sensitive individuals and evening dosing. Life Extension is a research-driven brand with rigorous quality standards. Single capsule provides a near-clinical dose.
NAC 600mg
Life ExtensionLife Extension is a research-driven brand known for rigorous quality standards and third-party testing. Their NAC delivers the full 600mg clinical dose with pharmaceutical-grade N-acetyl-L-cysteine. Clean formula with no unnecessary fillers. Good option for those who trust Life Extension's quality heritage.
Antarctic Krill Oil 1000mg
Sports ResearchUses Superba2 branded krill extract from Aker BioMarine with full MSC sustainability certification and IFOS 5-Star purity rating. The 1000mg dose delivers clinically meaningful phospholipid-bound EPA+DHA in a single softgel. Over 11,000 Amazon reviews confirm consistent quality.
Vitamin D3 + K2 (5000 IU)
Sports ResearchThe gold standard D3+K2 supplement. USP Verified potency. Coconut oil carrier enhances absorption of these fat-soluble vitamins. Combines 5,000 IU D3 with 100mcg K2 (MK-7) in a single softgel at an exceptional $0.13/serving. Over 50,000 Amazon reviews with a 4.8-star average.
Third-Party Tested
Products verified by independent labs for purity and potency.
Expert Reviewed
Every article reviewed by credentialed nutrition scientists and PharmDs.
Updated June 2026
Research and recommendations refreshed with the latest clinical data.
Browse by Condition
Find evidence-based supplement recommendations for specific health goals.
Acne
7 supplements reviewedAllergies
8 supplements reviewedAnxiety
12 supplements reviewedBack Pain
7 supplements reviewedBlood Pressure
11 supplements reviewedBlood Sugar Management
25 supplements reviewedBone Health
5 supplements reviewedBrain Fog & Focus
23 supplements reviewedChronic Fatigue Syndrome
9 supplements reviewedChronic Pain
5 supplements reviewedCognitive Decline
4 supplements reviewedCognitive Function
7 supplements reviewedFeatured Ingredients
Magnesium
Magnesium is an essential mineral that supports muscle function, sleep quality, and stress management. Most adults benefit from 200-400mg daily, with magnesium glycinate being the best-absorbed form for general use.
Vitamin D3
Fat-Soluble VitaminVitamin D3 is essential for bone health, immune function, and mood regulation. An estimated 42% of U.S. adults are deficient. Most adults benefit from 1,000-4,000 IU daily, and a 2017 meta-analysis found supplementation reduced the risk of acute respiratory infections by 12%.
Omega-3
Essential Fatty AcidOmega-3 fatty acids (EPA + DHA) reduce inflammation, support heart and brain health, and may improve mood. The REDUCE-IT trial showed high-dose EPA (4g/day) reduced cardiovascular events by 25%. Most adults benefit from 1,000-2,000mg combined EPA+DHA daily.
Probiotics
Live MicroorganismsProbiotics are live beneficial bacteria that support gut health, immunity, and mood through the gut-brain axis. A 2018 meta-analysis found significant IBS symptom reduction with multi-strain probiotics. Benefits are strain-specific — choose based on your health goal. Typical dose: 10-50 billion CFU daily. Look for third-party tested products with verified potency through the expiration date.
Ashwagandha
Adaptogenic HerbYes, ashwagandha is one of the most clinically studied adaptogens, with over 22 published clinical trials backing its benefits. A 2019 meta-analysis found it reduced stress scores by 44% and cortisol by 23% compared to placebo. The recommended dose is 300-600mg of root extract (KSM-66, standardized to withanolides) daily.
Melatonin
NeurohormoneMelatonin is the most well-studied natural sleep supplement, shown in a meta-analysis of 19 RCTs to reduce sleep onset latency by 7-12 minutes and improve sleep quality. Importantly, more is NOT better — doses as low as 0.5mg can be as effective as 5mg for sleep onset. It is also the best-evidenced supplement for jet lag.
Research-Backed Stacks
Pre-tested supplement combinations for specific health goals — with dosing, timing, and evidence for every ingredient.
Athletic Performance & Recovery
More strength. Faster recovery. Better endurance.
Cognitive Performance & Focus
Sharper thinking. Better memory. Sustained focus without the crash.
Immune Resilience
Year-round immune support backed by clinical evidence.
Longevity & Healthy Aging
Support the cellular pathways most linked to healthy aging.
Sleep Optimization
Fall asleep faster. Stay asleep longer. Wake up recovered.
Latest Research & Guides
Stay current with the latest supplement research and educational content.
Research Summaries
Our Research Standards
Every article is written by credentialed nutrition researchers, medically reviewed by licensed physicians, and cites peer-reviewed clinical trials. We never recommend products based on business partnerships.
Read our full methodology