What's Really In Your Supplements?
Clinical evidence for every ingredient. No hype. No guesswork. 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
As an Amazon Associate, we earn from qualifying purchases. Some links below are affiliate links — this doesn't affect our editorial independence or product ratings. How we evaluate products
FreshCap Thinkergy
FreshCap MushroomsCombines lion's mane fruiting body extract with cordyceps and rhodiola for a synergistic cognitive stack. All mushroom ingredients are fruiting body with verified beta-glucan content. FreshCap is a transparency leader — they publish full test results. Good option for nootropic stacking in a single product.
Grass Fed Bone Marrow
Ancestral SupplementsThe brand that popularized the ancestral organ supplement category. Sourced from New Zealand grass-fed cattle raised without hormones, pesticides, or GMO feed. Founder-led company with deep commitment to the nose-to-tail philosophy. The premium price reflects New Zealand sourcing and rigorous quality standards.
Vitamin D3 + K2 (5000 IU)
BronsonIncredible value at approximately $0.06/serving for a D3+K2 combination — the cheapest per-serving option by a wide margin. Bronson has been manufacturing supplements since 1960 with GMP certification. 250-count bottle provides over 8 months of daily supplementation.
5-HTP - Supplement that Supports a Healthy Outlook & Restful Sleep* - Vegan, Dairy-Free & Gluten-Free - 60 Capsules (60 Servings)
Integrative TherapeuticsIntegrative Therapeutics 5-HTP - Supplement that Supports a Healthy Outlook & Restful Sleep* - Vegan, Dairy-Free & Gluten-Free - 60 Capsules (60 Servings) provides 5 htp in a convenient form.
Third-Party Tested
Products verified by independent labs for purity and potency.
Evidence Based
Every article reviewed by our editorial team against published research.
Updated September 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
10 supplements reviewedBlood Sugar Management
24 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 may help some people sleep better, especially when intake is low or poor sleep is tied to stress, muscle tension, or restlessness. It is not a sedative, and sleep trial results are mixed, but magnesium glycinate is commonly preferred before bed because it is generally well tolerated and less laxative than citrate or oxide.
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 and reviewed by our editorial team against peer-reviewed clinical research, and cites its sources. We never recommend products based on business partnerships.
Read our full methodology